473 pubblicazioni classificate nel seguente modo:

Six-dimensional basins of attraction computation on small clusters with semi-parallelized SCM method
INTERNATIONAL JOURNAL OF DYNAMICS AND CONTROL
Autore/i: Andonovski, N.; Lenci, S.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/273244

The Lossetti Tower in Beura-Cardezza (Italy): Structural Assessment and Rehabilitation of a Historical Dry Stone Masonry Building
RILEM Bookseries
Autore/i: Monni, F.; Quagliarini, E.; Lenci, S.
Editore: Springer Netherlands
Classificazione: 2 Contributo in Volume
Abstract: Dry stone masonry (DSM) is an ancient construction method widely used for vernacular and military buildings in rural and mountain regions. The use of this particular method is due to the large availability of natural stone that characterized these areas. The consolidation of DSM buildings is a challenging issue: in fact, this kind of masonry proved to be scarcely reliable under eccentric and horizontal loads and in absence of elements that are long enough to cross the masonry in its thickness. However, there are very few techniques that can preserve the peculiarities of a masonry texture. This paper presents the design approach that was used for the structural rehabilitation of the Lossetti Tower, a medieval DSM watchtower located in Beura-Cardezza (Italy, Piemonte Region). First, a preliminary research on the building was conducted. Secondly, to better understand the masonry quality, both a 3D laser scanning geometric survey and a technological study of the masonry typology and texture of the tower were executed. Thirdly, to evaluate the mechanical behaviour, a diagonal compression test on the DSM specimens was performed. Finally, after a structural assessment, was developed a tailored design of the strengthening intervention by using the technique of continuous basalt fibers stitching. The proposed system consists in creating a mesh of basalt fiber ropes, that passes through the masonry thickness and ties the blocks together. This system also allows to connect the wall in the transverse direction and to improve the monolithic behaviour of masonry panels in perfect compatibility with the original materials and it was preferred to the more invasive ones also for its reversibility
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/268475

Comparative fragility methods for seismic assessment of masonry buildings located in Muccia (Italy)
JOURNAL OF BUILDING ENGINEERING
Autore/i: Chieffo, N.; Clementi, F.; Formisano, A.; Lenci, S.
Classificazione: 1 Contributo su Rivista
Abstract: The current paper focuses on a sector of the historic centre of Muccia, in the district of Macerata (Italy), affected by the seismic sequence that involved Central Italy in 2016. The main goal is comparison, in terms of fragility curves, among two vulnerability assessment methodologies (empirical and mechanical). The study area has been structurally and typologically identified according to the Building Typology Matrix (BTM). Physical vulnerability analysis of the urban-sector was performed through application of an index-based method, specifically for masonry building aggregates. An isolated masonry building, damaged after the seismic sequences, has been selected as a case study. For the assessed building, empirical fragility curves are presented according to Guagenti & Petrini’s correlation law. Furthermore, a numerical model has been set up by using the macro-element approach, which has allowed to perform non-linear static analyses. Mechanical properties of masonry were defined according to the New Technical Codes for Constructions (NTC18), assuming a limited knowledge level (LC1). Refined mechanical fragility functions have been derived and compared to the empirical ones. Analysis results have shown that the empirical method tends to overestimate by 5% and 10% the expected damage for slight and moderate thresholds. For PGA values greater than 0,3 g the damage levels decreased by 30% and 20%, with reference to the near collapse and collapse conditions, respectively.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/267525

Global dynamics and integrity of a micro-plate pressure sensor
COMMUNICATIONS IN NONLINEAR SCIENCE & NUMERICAL SIMULATION
Autore/i: Belardinelli, P.; Sajadi, B.; Lenci, S.; Alijani, F.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/262764

Basins of Attraction for Higher-Dimensional Nonlinear Dynamical Systems: Preliminary Results on the Case Study of a Sympodial Tree
IUTAM Symposium on Exploiting Nonlinear Dynamics for Engineering Systems
Autore/i: Andonovski, Nemanja; Lenci, Stefano; Kovacic, Ivana
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/269315

Nonlinear Dynamics of a Planar Hinged-Simply Supported Beam with One End Spring: Higher Order Resonances
IUTAM Symposium on Exploiting Nonlinear Dynamics for Engineering Systems
Autore/i: Kloda, Lukasz; Lenci, Stefano; Warminski, Jerzy
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/269316

Introduction to Scientific Computing Technologies for Global Analysis of Multidimensional Nonlinear Dynamical Systems
Nonlinear Structural Dynamics and Damping
Autore/i: Andonovski, Nemanja; Moglie, Franco; Lenci, Stefano
Editore: Springer International Publishing
Classificazione: 2 Contributo in Volume
Abstract: To determine global behaviour of a dynamical system, one must find invariant sets (attractors) and their respective basins of attraction. Since this cannot be made extensively with analytical methods, the numerical global analysis is currently the subject of intensive research, especially for strongly nonlinear, multidimensional dynamical systems. Numerical analysis in dimensions higher than four present a challenge, since it requires significant computing resources. Numerical methods used in global analysis that can benefit from high-power computing are those that can parallelize either data or task elaboration on a large scale. Mass parallelization comes with large number of difficulties, restrictions and programming hazards. When not implemented in compliance with hardware organization, data and instruction management can lead to severe loss of parallel algorithm performance. Systematic and methodical approach to design parallel programs is, therefore, critical to get the most from expensive high-power computing systems and to avoid unrealistic speed-up expectation. Considering these difficulties, the goal of this chapter is to introduce readers to the world of high-power computing systems for science and global analysis of strongly nonlinear, multidimensional dynamical systems. Topic covered are classification and performance of hardware and software, classes of computing problems and methodical design of programs. Two major hardware platforms used for scientific computing, clusters and systems with computational GPU are considered. Functionality of widely utilized software solutions (OpenMP, MPI, CUDA and OpenCL) for high-power computing systems is described. Performance of individual computer components are addressed so that the reader can understand advantages, disadvantages, efficiency and limits of each hardware platform. With this knowledge users can judge if their computation problem is suitable for mass parallelization. If this is the case, which hardware and software platforms to use. To avoid many traps of parallel programming, one of the methodical design approaches is covered. Topic is closed with example applications in science and global analysis.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/264456

Influence of geometric nonlinearities on the asynchronous modes of an articulated prestressed slender structure
JOURNAL OF VIBRATION AND ACOUSTICS
Autore/i: Ribeiro, Eduardo A. R.; Mazzilli, Carlos E. N.; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/264671

FLOOD IMPACTS ON BUILDINGS: FIRST EXPERIMENTAL AND NUMERICAL RESULTS
Proceedings del XXXVI Convegno Nazionale di Idraulica e Costruzioni Idrauliche
Autore/i: Brocchini, Maurizio; Capozucca, Roberto; Clementi, Francesco; Darvini, Giovanna; Giordano, Ersilia; Lenci, Stefano; Postacchini, Matteo; Zitti, Gianluca
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/263397

DYNAMICS AND STABILITY: A LONG HISTORY FROM EQUILIBRIUM TO DYNAMICAL INTEGRITY
MEMORIE DELL'ISTITUTO LOMBARDO. ACCADEMIA DI SCIENZE E LETTERE. CLASSE DI SCIENZE MATEMATICHE E NATURALI
Autore/i: Maracci, Diletta; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/276839

An innovative technique for confinement of historical masonry columns: Experimental results
Proceedings of the International Masonry Society Conferences
Autore/i: Monni, F.; Quagliarini, E.; Geminiani, S.; Schiavoni, M.; Tirabassi, M.; Lenci, S.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/324994

Numerical model upgrading of ancient bell towers monitored with a wired sensors network
Proceedings of the International Masonry Society Conferences
Autore/i: Clementi, F.; Pierdicca, A.; Milani, G.; Gazzani, V.; Poiani, M.; Lenci, S.
Editore: International Masonry Society
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this work, the opportunities provided by dynamic identification techniques for non-destructive evaluation of heritage structures are discussed with a focus on different bell towers, located in the Ferrara Province (Italy). All of them were stricken by a long seismic sequence (Emilia Romagna, North-East of Italy, May-June 2012 seismic sequence) and they are investigated in detail to have an insight into their dynamic behaviour. Furthermore, the experimental investigations and the operational modal analysis results are presented and they are useful for defining the Finite Element (FE) models of the towers within a continuum approach. The monitoring system consists of several sensors properly connected. The positioning of the instrumentation has been conditioned by many operative problems due to the limited accessibility of the structures, both related to the main access and to reaching the top. However, it has been possible to identify with a certain confidence the first three frequencies of the towers and their corresponding mode shapes. The results carried out after the FE updating procedure may be considered very good. The material data values estimated in this way will constitute an important reference for the evaluation of the state of the building.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/264150

Modal parameters identification with environmental tests and advanced numerical analyses for masonry bell towers: a meaningful case study
Proceedings of XIV International Conference on Building Pathology and Constructions Repair – CINPAR 2018
Autore/i: Gazzani, V.; Poiani, M.; Clementi, F.; Milani, G.; Lenci, S.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In the first part, a dynamic monitoring for non-destructive evaluation of heritage structures is discussed with reference to a case study, namely the Pomposa Abbey belfry, located in the Ferrara Province (Italy). The main dynamic parameters constitute an important reference to define an advanced numerical model, discussed in the second part, based on Non-Smooth Contact Dynamics (NSCD) method. Schematised as a system of rigid blocks undergoing frictional sliding and plastic impacts, the tower has exhibited complex dynamics, because of both geometrical nonlinearity and the non-smooth nature of the contact laws. First, harmonic oscillations have been applied to the basement of the tower and a systematic parametric study has been conducted, aimed at correlating the system vulnerability to the values of amplitude and frequency of the assigned excitation corroborated by the dynamic identification results. In addition, numerical analyses have been done to highlight the effects of the friction coefficient and of the blocks geometries on the dynamics, in particular on the collapse modes. Finally, a study of the tower stability against seismic excitations has been addressed and 3D simulations have been performed with a real earthquake.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/262326

Monitoring cultural heritage buildings: The San Ciriaco bell-tower in Ancona
Proceedings of the International Conference of Computational Methods in Sciences and Engineering 2018 (ICCMSE-2018)
Autore/i: Ribilotta, Elisa; Clementi, Francesco; Pellegrino, Marco; Poiani, Marina; Gazzani, Valentina; Santilli, Graziano; Lenci, Stefano
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The preliminary results of an ambient-vibration based investigation conducted on the San Ciriaco Belfry in Ancona (Italy) is presented. The assessment procedure includes full-scale ambient vibration testing, modal identification from ambient vibration responses, finite element modeling and dynamic-based identification of the uncertain structural parameters of the model. As the most doubtful parameters, the modulus of elasticity of the masonry is adjusted to achieve the experimental results with numerical model by simple operations
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/262450

An innovative building envelope (kinetic façade) with Shape Memory Alloys used as actuators and sensors
AUTOMATION IN CONSTRUCTION
Autore/i: Formentini, Marco; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/254151

Iconic crumbling of the clock tower in Amatrice after 2016 central Italy seismic sequence: advanced numerical insight
Proceedings of XIV International Conference on Building Pathology and Constructions Repair – CINPAR 2018
Autore/i: Poiani, M.; Gazzani, V.; Clementi, F.; Milani, G.; Valente, M.; Lenci, S.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The present paper investigates from an advanced numerical point of view the progressive damage of the Amatrice (Rieti, Italy) civic clock tower, after a long sequence of strong earthquakes that struck central Italy in 2016. Two advanced numerical models are here utilised to have an insight into the modalities of progressive damage and the behaviour of the structure under strong non-linear dynamic excitations, namely a Non-Smooth Contact Dynamics (NSCD) and a FE Concrete Damage Plasticity (CDP) models. In both cases, a full 3D detailed discretization is adopted. From the numerical results, both the role played by the actual geometries and the insufficient resistance of the constituent materials are envisaged, showing a good match with actual crack patterns observed after the seismic sequence.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/262325

Nonlinear dynamics of a planar beam–spring system: analytical and numerical approaches
NONLINEAR DYNAMICS
Autore/i: Kloda, Lukasz; Lenci, Stefano; Warminski, Jerzy
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/262699

The non-smooth contact dynamics method for the analysis of an ancient masonry tower
Proceedings of INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2018 (ICCMSE 2018)
Autore/i: Clementi, Francesco; Milani, Gabriele; Gazzani, Valentina; Poiani, Marina; Cocchi, Giammichele; Lenci, Stefano
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The dynamics of a medieval tower, inside the Basilica of San Benedetto in Ferrara (Italy), subjected to transversal dynamic loadings has been analyzed by using a distinct element code which implements the Non-Smooth Contact dynamics method. Since the contact between blocks is governed by the Signorini’s impenetrability condition and the dry-friction Coulomb’s law, the tower exhibits discontinuous dynamics. The sliding motions of blocks are non-smooth functions of time. Numerical simulations are performed with the aim of investigating the influence of the friction coefficient but also of the amplitude and frequency of the excitation at the base.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/262449

Axial-transversal coupling in the nonlinear dynamics of a beam with an inclined roller
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
Autore/i: Lenci, S.; Clementi, F.
Classificazione: 1 Contributo su Rivista
Abstract: The nonlinear oscillations of an Euler–Bernoulli beam hinged at one end and having a roller support sliding on a inclined line on the other end are investigated for the first time (to the best of the authors’ knowledge). Free and forced dynamics are studied, and the backbone curve and frequency response curve are obtained by the multiple time scale method. These results allow us to detect analytically the main features of the nonlinear dynamics, in particular the hardening/softening dichotomy, and how it is influenced by the various beam parameters. Furthermore, the analytical results are compared with finite element simulations to check their reliability. The main goal of the paper is that of investigating the coupling between axial and transversal displacements, which appears yet in the linear regime (first order solution) due to the slope of the constraint. An element of novelty consists of showing the qualitative and quantitative changes that the coupling undergoes passing from small (linear regime) to moderate and large (nonlinear regime) displacements.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/258881

Seamless variation of isometric and anisometric dynamical integrity measures in basins's erosion
COMMUNICATIONS IN NONLINEAR SCIENCE & NUMERICAL SIMULATION
Autore/i: Belardinelli, P.; Lenci, S.; Rega, G.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/254150

Seismic Assessment of a Monumental Building through Nonlinear Analyses of a 3D Solid Model
JOURNAL OF EARTHQUAKE ENGINEERING
Autore/i: Clementi, F.; Gazzani, V.; Poiani, M.; Mezzapelle, P. A.; Lenci, S.
Classificazione: 1 Contributo su Rivista
Abstract: The paper analyzes the static behavior and the seismic vulnerability of the “San Francesco ad Alto” building in Ancona (Italy), which is currently used as a Regional Headquarter of the Marche Region by the Italian Army and was formerly a monastery. The global static structural behavior and the dynamic properties have been evaluated using the Finite Element modeling technique, in which the nonlinear behavior of masonry has been taken into account by proper constitutive laws. The concepts of homogenized material and smeared cracking are used to evaluate the capacity of the monastery to withstand lateral loads together with the expected demands resulting from seismic actions (N2 method), using a nonlinear static analysis (pushover). The comparison of seismic demand and capacity confirms the susceptibility of these types of buildings to extensive damage and collapse, as frequently observed in similar buildings. This paper aims to point out that advanced numerical analyses can offer significant information on the understanding of the actual structural behavior of historical buildings. It is believed that the methodology and the overall conclusions of this case study are valid for many historical monasteries in Europe.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247516

Carbon nanofibers in polyurethane foams: Experimental evaluation of thermo-hygrometric and mechanical performance
POLYMER TESTING
Autore/i: Stazi, Francesca; Tittarelli, Francesca; Saltarelli, Federico; Chiappini, Gianluca; Morini, Antonio; Cerri, Graziano; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Abstract: Polymer nanocomposites synergistically combine the good thermal properties of the hosting polymer matrix with the high mechanical performance of the fillers, providing a new class of materials with superior properties. The present study aims to evaluate in a multidisciplinary way the enhancement in mechanical and thermalhygrometric properties of low and medium density nanophased polyurethane (PUR) foams with either randomly oriented or aligned nanofibers as compared to the neat ones. To this aim, 1% weight of carbon nanofibers (CNFs) were homogeneously dispersed into polyol of PUR foam by an ultrasonic cavitation method. In parallel, a small amount of CNFs was functionalized in advance by a coprecipitation method so as to align them into the polymer matrix through an external low intensity magnetic field. SEM analyses were used to compare the microstructure of the neat and nanophased samples. Results have shown that the addition of carbon nanofibers in the foams products a closer structure with a more uniform size and shape. Moreover, functionalized CNFs play a significant role in regulating cells shape as well as strengthening cells walls. Mechanical test results also demonstrated that CNFs increase both strength and stiffness of the samples. The alignment of carbon nanofibers within medium density nanophased foams determines the highest mechanical properties. However, the more noticeable improvement in samples performance occurred in low density nanophased foams. Finally, carbon nanoparticles decrease the thermal conductivity and increase the resistance against water adsorption.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/256087

Nonlinear dynamics of a planar hinged-supported beam with one end spring system
MATEC Web of Conferences
Autore/i: Kloda, Lukasz; Lenci, Stefano; Warminski, Jerzy
Editore: EDP Sciences
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/259998

Stochastic Switching and Reduction of Integrity in Atomic Force Microscopy
ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
Autore/i: Belardinelli, Pierpaolo; Lenci, Stefano; Alijani, Farbod
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/269428

Isochronous beams by an inclined roller support
JOURNAL OF APPLIED MECHANICS
Autore/i: Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/260000

Externally excited purely nonlinear oscillators: insights into their response at different excitation frequencies
NONLINEAR DYNAMICS
Autore/i: Kovacic, Ivana; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/254149

Revealing compactness of basins of attraction of multi-DoF dynamical systems
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Autore/i: Brzeski, P.; Belardinelli, P.; Lenci, S.; Perlikowski, P.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/259290

Foldover effect and energy output from a nonlinear pseudo-maglev harvester
AIP Conference Proceedings
Autore/i: Kecik, Krzysztof; Mitura, Andrzej; Warminski, Jerzy; Lenci, Stefano
Editore: American Institute of Physics Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/259996

Analisi delle vulnerabilità sismiche locali
San Francesco ad Alto di Ancona - Storia, analisi e ipotesi di valorizzazione architettonica
Autore/i: Lenci, S; Clementi, F; Mezzapelle, P. A.
Editore: Aracne editrice
Luogo di pubblicazione: Canterano (RM)
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252045

Experimental investigation of masonry columns strengthening using basalt fibre ropes: first results
REHAB 2017
Autore/i: Monni, F.; Quagliarini, E.; Vaccarini, M.; Lenci, S.
Editore: Green Lines Institute for Sustainable Development
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255486

Edifici esistenti in muratura e terremoto: tecnologie innovative e conoscenza per aumentare la resilienza
Building Back Better: idee e percorsi per la costruzione di comunità resilienti
Autore/i: Lenci, S.; Mezzapelle, P. A.; Clementi, F.
Editore: Carocci editore pressonline
Luogo di pubblicazione: Roma
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252044

TECNICHE DI IDENTIFICAZIONE MODALE PER L’ANALISI STRUTTURALE. L’evoluzione del comportamento dinamico di un edificio scolastico in cemento armato soggetto a miglioramento sismico
STRUCTURAL
Autore/i: Clementi, Francesco; Lenci, Stefano; Monni, Francesco; Pierdicca, Alessio; Massaccesi, M.
Classificazione: 1 Contributo su Rivista
Abstract: This work deals with the structural retrofitting of a Reinforced Concrete (RC) building school and illustrates the results of a structural monitoring campaign performed on this. The examined school building presents typical and specific vulnerabilities of Italian building stock - of which RC buildings currently represent the greatest portion - mostly built in 60’s and 70’s Because of its vulnerabilities, the structure was subjected to a deep structural retrofitting intervention based on increasing of original columns cross-sections with introduction of new longitudinal steel bars and stirrups, and application of shear reinforcement on beams using Fiber Reinforced Polymers (FRP). The building was monitored using Operational Modal Analysis (OMA) technique, that offers the possibility of describing structural dynamics at small vibration amplitudes in real operating conditions with unknown excitation inputs. The long-term Ambient Vibration Survey (AVS) - performed before, during and after the works, in a campaign lasted one year - highlighted the increasing of building performance in terms of natural frequencies following the retrofitting works. Moreover, the paper shows how infill panels influence the dynamic response of this typical RC structure. This relevant data collection, in addition to confirm the potentil of OMA technique in gathering the real structure behavoiur, could be very helpful in the calibration of other similar retrofitting interventions.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/248956

Riduzione del rischio sismico e retrofitting degli edifici scolastici: il caso della scuola “Puccini” di Senigallia (AN)
Colloqui.AT.e 2017. DEMOLITION OR RECONSTRUCTION?
Autore/i: Monni, F.; Quagliarini, E.; Lenci, S.; Clementi, Francesco
Editore: Edicom edizioni, Monfalcone (Gorizia)
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255484

FREQUENZE PROPRIE E COMPORTAMENTO ACUSTICO DI VETRATE DI SICUREZZA IN APPLICAZIONI EDILI
STRUCTURAL
Autore/i: Consolini, Laura; Clementi, Francesco; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Abstract: Con l’introduzione in campo nazionale della Norma UNI 7697:2015 – Criteri di sicurezza per le applicazioni vetrarie, si è data ancora più importanza alla scelta delle vetrate stratificate di sicurezza da utilizzarsi nelle diverse e più comuni applicazioni. Il vetro, ed in particolare il vetro stratificato di sicurezza, è infatti diventato sempre più utilizzato in edilizia e architettura. Quindi esso è stato sempre più oggetto di studio per comprenderne il comportamento meccanico. In questo lavoro, i moduli elastici sono determinati tramite identificazione dinamica “Modal Testing”, cioè l’acquisizione di dati sperimentali e il loro successivo post-processing per l’identificazione di un modello matematico che descriva il comportamento dinamico della struttura. Le frequenze e gli smorzamenti modali sono stati identificati mediante il metodo “Fitting Time History” (FTH), basato sull’acquisizione di accelerogrammi ed un’ottimizzazione ai minimi quadrati tra il segnale misurato ed un’approssimazione analiticamente determinata. Si affronta anche il tema dell’isolamento acustico dei medesimi componenti vetrati, essendo la risposta vibrazionale strettamente connessa al comportamento acustico del vetro.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251137

Basalt fiber continuous stitchings for strengthening the dry stone masonry of the Lossetti Tower in Beura-Cardezza (Italy)
TEMA
Autore/i: Monni, F.; Quagliarini, E.; Lenci, S.
Classificazione: 1 Contributo su Rivista
Abstract: Dry stone masonry is widely used in rural and mountain regions and its consolidation is a challenge issue if it is wanted to preserve the peculiarities of masonry texture. In this paper is presented the design approach used for consolidation intervention of Lossetti Tower - a medieval dry stone watchtower located in Beura-Cardezza (Italy, Piemonte Region) - using the technique of continuous basalt fibres stitching, consisting in creating a mesh of BF ropes, which pass through the masonry thickness and tie blocks together. A 3D laser scanner survey of the tower was executed and, to evaluate the technique effectiveness, diagonal compression test on masonry specimens was done, in order to develop a tailored design of the strengthening intervention, in perfect compatibility with the original structures
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255483

The NSCD method for dynamic analyses of ancient masonry tower under transversal dynamic loadings
Proceedings of 9th European Nonlinear Dynamics Conference
Autore/i: Clementi, Francesco; Ferrante, A.; Lenci, Stefano
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/249549

Cultural Heritage and Earthquake: The Case Study of “Santa Maria Della Carità” in Ascoli Piceno
THE OPEN CIVIL ENGINEERING JOURNAL
Autore/i: Clementi, F.; Quagliarini, E.; Monni, F.; Giordano, E.; Lenci, S.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252430

Pre-tensioned basalt fibers ropes stitching for masonry strengthening against vertical bending: A first experimental insight
Mechanics of Masonry Structures Strengthened with Composite Materials II
Autore/i: Monni, Francesco; Quagliarini, Enrico; Lenci, Stefano
Editore: Trans Tech Publications Ltd
Classificazione: 2 Contributo in Volume
Abstract: This paper presents the results of an experimental campaign aimed at improving the innovative technique of continuos basalt fiber (BF) stitching in order to repair the masonry panels damaged by seismic events or to enhance the seismic behavior of unreinforced masonry walls. The masonry panels were tested under out-of-plane actions, one of the common way of failure for masonry walls during an earthquake. The most significant change introduced respect to the system already tested in previous studies, is the presence of pre-tensioned elements and mechanical anchorage of the BF ropes, always with the end of proposing a dry retrofitting system. The results indicate the effectiveness of this, increasing the performance of masonry wall specimens under outof- plane actions respect to the damaged and unreinforced conditions. Besides, this technique potentially appears fully sustainable, because it is cheap, compatible, reversible, fire, and chemical resistant, it improves but not replaces original materials and, finally, it does not substantially use synthetic adhesives. All these reasons make this novel application of BF ropes fully sustainable and specialized to architectural heritage restoration.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255436

Numerical model upgrading of a historical masonry building damaged during the 2016 Italian earthquakes: the case study of the Podestà palace in Montelupone (Italy)
JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING
Autore/i: Clementi, F.; Pierdicca, A.; Formisano, A.; Catinari, F.; Lenci, S.
Classificazione: 1 Contributo su Rivista
Abstract: In October 2016, two major earthquakes occurred in Marche region in the Centre of Italy, causing widespread damage. The epicentre of the second one struck Norcia, Visso and Accumoli and a lot of damages to cultural heritage were done in the cities of Tolentino, San Severino, Camerino, Matelica, Macerata and Montelupone, where are located the Podestà Palace and the Civic Tower investigated in this paper. The main aim of this research is the determination of modal properties of these historical masonry constructions using experimental and numerical studies. The experimental analysis was based on ambient vibration survey, while numerical analysis was based on finite element analysis with solid elements. The results of the experimental study were used to tune the numerical model of the structure. As the most doubtful parameters, the modulus of elasticity of the masonry and the interaction among structural parts were adjusted to achieve the experimental results with numerical model by simple operations. Obtaining good consistency between the experimental and numerical analyses, the study revealed the actual dynamic properties of the damaged palace.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251396

A more sustainableway for producing RC sandwich panels on-site and in developing countries
SUSTAINABILITY
Autore/i: Graziani, Lorenzo; Quagliarini, Enrico; D'Orazio, Marco; Lenci, Stefano; Scalbi, Agnese
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246855

Strengthening three-leaf masonry with basalt fibre: Experimental and numerical data
AIP Conference Proceedings
Autore/i: Monni, F.; Quagliarini, E.; Lenci, S.; Maracchini, G.
Editore: American Institute of Physics Inc.
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/268566

Reply to the Discussion on ‘A comprehensive analysis of hardening/softening behavior of shearable planar beams with whatever axial boundary constraint’, by D. Genovese
MECCANICA
Autore/i: Lenci, S.; Clementi, F.; Rega, G.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246022

Improving the Global Analysis of Mechanical Systems via Parallel Computation of Basins of Attraction
Procedia IUTAM
Autore/i: Belardinelli, Pierpaolo; Lenci, Stefano
Editore: Elsevier B.V.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/254141

Preliminary study of the influence of different modelling choices and materials properties uncertainties on the seismic assessment of an existing RC school building
Proceedings INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016)
Autore/i: Maracchini, G.; Clementi, F.; Quagliarini, E.; Lenci, S.; Monni, F.
Editore: AIP Conference Proceedings
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: This paper studies the influence of some aleatory and epistemic uncertainties on the seismic behaviour of an existing RC school building through a codified sensitivity analysis that uses pushover analyses and a logic tree approach. The considered epistemic uncertainties, i.e. diaphragm stiffness and modelling of stairs, seem not influencing the final assessment in term of index of seismic risk. Vice versa, aleatory ones, i.e. concrete and steel mechanical properties, strongly affect the Index. For this reason, investigations and tests should focus on the study of the mechanical properties, and, in particular, on the study of columns’ concrete mechanical properties, which have the largest impact on the building seismic response.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/250263

Seismic assessment of cultural heritage: Nonlinear 3D analyses of “Santa Maria della Carità” in Ascoli Piceno
Proceedings of the 6th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
Autore/i: Monni, F.; Clementi, F.; Quagliarini, E.; Giordano, E.; Lenci, S.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In this paper a masonry church is analysed in order to assess its seismic vulnerability with respect to the actual state of conservation, including past retrofitting. The case study is the “Santa Maria della Carità” church, located in Ascoli Piceno, a small town of Marche region, in the Centre of Italy, where two major earthquakes occurred in August and in October 2016, causing widespread damage. The church has a large historical, architectural value because is one of the most important example of the Barocco age in the region, and contains a lot of precious paintings of local artists. Moreover it has also a social value for the city of Ascoli Piceno, because it is the only one that is opened to the devotees for every moment of day and night. Stroked also by the L’Aquila earthquakes (2009) the church was subjected to a retrofit intervention (2010), in order to obtain a better “box-like behaviour”. Churches are usually characterised by a high seismic vulnerability due to their structural and geometric configurations, heterogeneous and deteriorated materials. These structures have very large and high external walls without internal orthogonal walls: the space thus created is often covered by some thin vaults or thrusting arches. In this work using an advanced FEM approach (a 3D nonlinear solid numerical model has been used to evaluate the seismic capacity) the structure has been studied to establish its significant deficiencies, in order to obtain a clear understanding of the structural behavior. The results should be useful to design a reliable strengthening intervention, but they could be also extrapolated to the wide variety of historical churches, and generalized for a wide masonry building category.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251271

Energy harvesting from a magnetic levitation system
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
Autore/i: Kecik, Krzysztof; Mitura, Andrzej; Lenci, Stefano; Warminski, Jerzy
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246857

Comparing Nonlinear Free Vibrations of Timoshenko Beams with Mechanical or Geometric Curvature Definition
Proceedings of the International Congresses on Theoretical and Applied Mechanics (ICTAM)
Autore/i: Lenci, S.; Clementi, F.; Rega, G.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246049

Global analyses of historical masonry buildings: Equivalent frame vs. 3D solid models
Proceedings INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016)
Autore/i: Clementi, F.; Mezzapelle, P. A.; Cocchi, G.; Lenci, S.
Editore: AIP Conference Proceedings
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The paper analyses the seismic vulnerability of two different masonry buildings. It provides both an advanced 3D modelling with solid elements and an equivalent frame modelling. The global structural behaviour and the dynamic properties of the compound have been evaluated using the Finite Element Modelling (FEM) technique, where the nonlinear behaviour of masonry has been taken into account by proper constitutive assumptions. A sensitivity analysis is done to evaluate the effect of the choice of the structural models.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/250260

Cross-checking asymptotics and numerics in the hardening/softening behaviour of Timoshenko beams with axial end spring and variable slenderness
ARCHIVE OF APPLIED MECHANICS
Autore/i: Clementi, F.; Lenci, S.; Rega, G.
Classificazione: 1 Contributo su Rivista
Abstract: Two approximate solutions for the nonlinear free oscillations of a planar Timoshenko beam are compared to each other. The beam has an axial spring that permits to consider different boundary conditions, from axially free (which has a softening nonlinear behaviour) to perfectly axially restrained (which has a hardening nonlinear behaviour). The first approximation is analytical and is obtained by the asymptotic development method, while the second is numerical and is obtained by the finite element method. The comparison is made in terms of backbone curves describing the dependence of the (nonlinear) frequency on the oscillation amplitude. Very good agreement is found, for both slender and thick beams, and for varying stiffness of the end spring. This is a cross-check verification of the reliability of both approximate solutions.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/235994

Consequences of different definitions of bending curvature on nonlinear dynamics of beams
Procedia Engineering
Autore/i: Babilio, Enrico; Lenci, Stefano
Editore: Elsevier Ltd
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/254143

A Novel and Sustainable Application of Basalt Fibers for Strengthening Unreinforced Masonry Walls
JOURNAL OF NATURAL FIBERS
Autore/i: Quagliarini, Enrico; Scalbi, Agnese; Monni, Francesco; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246853

Investigation of the dynamic loads on a vertically oscillating circular cylinder close to the sea bed: The role of viscosity
JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME
Autore/i: Pierro, Alessio; Tinti, Enrico; Lenci, Stefano; Brocchini, Maurizio; Colicchio, Giuseppina
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251394

The Influence of Dowel-Pin Connections on the Seismic Fragility Assessment of RC Precast Industrial Buildings
THE OPEN CIVIL ENGINEERING JOURNAL
Autore/i: Mezzapelle, Pardo Antonio; Scalbi, Agnese; Clementi, Francesco; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252431

Characterization of the cyclic-plastic behaviour of flexible structures by applying the Chaboche model
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
Autore/i: Mancini, Edoardo; Isidori, Daniela; Sasso, Marco; Cristalli, Cristina; Amodio, Dario; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246859

Nonlinear analyses and failure patterns of typical masonry school buildings in the epicentral zone of the 2016 Italian earthquakes
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2017 (ICCMSE-2017)
Autore/i: Clementi, C.; Clementi, F.; Lenci, S.
Editore: American Institute of Physics
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The paper discusses the behavior of typical masonry school buildings in the center of Italy built at the end of 1950s without any seismic guidelines. These structures have faced the recent Italian earthquakes in 2016 without diffuse damages. Global numerical models of the building have been built and masonry material has been simulated as nonlinear. Sensitivity analyses are done to evaluate the reliability of the structural models.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252040

Seismic assessment of existing precast concrete buildings: Influence of deformable connections
Proceedings INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016)
Autore/i: Scalbi, A.; Clementi, F.; Cocchi, G.; Lenci, S.
Editore: American Institute of Physics
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The paper is focused on the key role of the connections between precast elements in determining the seismic performance of industrial Precast Structures (PS). The work critically investigates the influence of different variables on the connection behaviour, as well as the results of the different safety assessment approaches. Referring to a case study based on an industrial PS located in Italy, one highlights the importance of the connection in the seismic upgrade of existing PS, and the minor role of the mechanical slenderness of the column when considering weak connections.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/250261

Identification and calibration of the structural model of historical masonry building damaged during the 2016 Italian earthquakes: The case study of Palazzo del Podestà in Montelupone
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2017 (ICCMSE-2017)
Autore/i: Catinari, F.; Pierdicca, A.; Clementi, F.; Lenci, S.
Editore: AIP Publishing
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The results of an ambient-vibration based investigation conducted on the “Palazzo del Podestà” in Montelupone (Italy) is presented. The case study was damaged during the 2016 Italian earthquakes that stroke the central part of the Italy. The assessment procedure includes full-scale ambient vibration testing, modal identification from ambient vibration responses, finite element modeling and dynamic-based identification of the uncertain structural parameters of the model. A very good match between theoretical and experimental modal parameters was reached and the model updating has been performed identifying some structural parameters.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/252041

The Use of the Fitting Time Histories Method to Detect the Nonlinear Behaviour of Laminated Glass
JOURNAL OF VIBRATION TESTING AND SYSTEM DYNAMICS
Autore/i: Lenci, S.; Consolini, L.; Clementi, F.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246854

On the notion of curvature and its mechanical meaning in a geometrically exact plane beam theory
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
Autore/i: Babilio, Enrico; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/254140

Influence of the Shear-Bending Interaction on the Global Capacity of Reinforced Concrete Frames
Performance-Based Seismic Design of Concrete Structures and Infrastructures
Autore/i: Clementi, F.; Di Sciascio, G.; Di Sciascio, S.; Lenci, S.
Editore: IGI - Global
Luogo di pubblicazione: Hershey, Pennsylvania (USA)
Classificazione: 2 Contributo in Volume
Abstract: In many seismic countries in the world (e.g. Europe, Northern USA, Japan, Turkey, etc.), the assessment of existing structures is a priority, since the majority of the building heritage was designed according to out-of-date or even non-seismic codes. The uncertainties about the nonlinear behaviour of the structures are, therefore, important and the nonlinear response should be treated directly, with a correspondingly strong increase in complexity of the assessment procedure. The assessment of regular reinforced concrete frame buildings has been performed, according to the Italian Seismic Code, Eurocode 8 and the CNR DT-212 guideline. A lumped plasticity model has been used with the aim of quantifying the differences between a fixed and a continuously updated shear span and between the use of inelastic springs located at the member ends or continuously along the beam elements, and with the purpose of considering the influence of axial-bending-shear interaction on the global capacity of the buildings.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/249023

Flexible repointing of historical facing-masonry column-type specimens with basalt fibers: A first insight
JOURNAL OF CULTURAL HERITAGE
Autore/i: Quagliarini, Enrico; Monni, Francesco; Greco, Federica; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246856

One-year monitoring of a reinforced concrete school building: Evolution of dynamic behavior during retrofitting works
Proceedings of X International Conference on Structural Dynamics - EURODYN 2017
Autore/i: Pierdicca, A.; Clementi, F.; Mezzapelle, P.; Fortunati, A.; Lenci, S.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: This work illustrates the results of a one-year structural monitoring campaign of a Reinforced Concrete (RC) school building subjected to a substantial retrofitting works. Through Operational Modal Analysis (OMA) techniques, it has been possible to follow the dynamic evolution of the structure, using Finite Element Method (FEM) model refinement as a valuable tool for non-invasive structural assessment. The long-term Ambient Vibration Survey (AVS) highlighted the increasing of building performance in terms of natural frequencies following the retrofitting works. This relevant data collection can be extremely helpful in calibrating of other similar retrofitting interventions and provides useful guidelines that can assist in the planning of Structural Health Monitoring (SHM) applications.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/250776

Revealing nonlinear dynamical behaviour of laminated glass
Proceedings of X International Conference on Structural Dynamics - EURODYN 2017
Autore/i: Lenci, S.; Consolini, L.; Clementi, F.; Cocchi, G.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The dynamical properties of a laminated glass are investigated by applying the Fitting Time History (FTH) method to experimental free vibration response. Both linear and the nonlinear parameters are detected, and attention is focused on these latters since they are the most important element of novelty of this work. Some one-mode identifications are considered first, and then the approximation is improved by considering multi-mode identifications, that allow us to detect simultaneously the linear and nonlinear properties of various vibration modes, a fact that is an appealing feature of the FTH method.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/250775

Asynchronous free oscillations of linear mechanical systems: A general appraisal and a digression on a column with a follower force
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
Autore/i: Lenci, Stefano; NIGRO MAZZILLI, CARLOS EDUARDO
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/254139

Influence of the mechanics of escape on the instability of von Mises truss and its control
Procedia Engineering
Autore/i: Orlando, Diego; Gonçalves, Paulo B.; Lenci, Stefano; Rega, Giuseppe
Editore: Elsevier Ltd
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/254142

Asynchronous modes of vibrations in linear conservative systems: an illustrative discussion of plane framed structures
MECCANICA
Autore/i: Lenci, Stefano; Mazzilli, Carlos Eduardo Nigro
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246858

Control of global bifurcations in a noncontact atomic force microcantilever
International Conference on Structural Nonlinear Dynamics and Diagnosis
Autore/i: Settimi, V; Rega, G; Lenci, S
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/290271

Global dynamics-based control of a noncontact atomic force microcantilever
6th International Conference on Nonlinear Vibrations, Localization and Energy Transfer
Autore/i: Settimi, V; Rega, G; Lenci, S
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/290297

Increasing Practical Safety of Von Mises Truss via Control of Dynamic Escape
Applied Mechanics and Materials
Autore/i: Orlando, Diego; Gonçalves, Paulo Batista; Lenci, Stefano; Rega, Giuseppe
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246848

Ingegneria “su misura” per il consolidamento di una torre medievale in muratura a secco
MATER(i)A. Materials, Architecture, Technology, Energy/Environment, Reuse (Interdisciplinary), Adaptability
Autore/i: Monni, F.; Quagliarini, E.; Lenci, S.
Editore: Gangemi Editore
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255488

New materials and technologies in in architectural heritage restoration: masonry columns confinement using basalt fibres ropes
TEMA
Autore/i: Monni, F.; Quagliarini, E.; Greco, F.; Lenci, S.
Classificazione: 1 Contributo su Rivista
Abstract: This paper deals with strengthening and consolidation of masonry columns, a long developed issue that also in the past interested restorers and designers in their works. A typical past solution for solving this kind of problem involves the use of a jacketing of the column by metal profiles. Nowadays strips of composite materials have been substituting these last ones but, when it is wanted to maintain the original aspect of the brickwork, this technique cannot be applied, so an experimental campaign about consolidation of masonry columns using a flexible element located in mortar joints has been developed. The results show the effective of this innovative technique in enhancing compressive strength of masonry columns without compromising their aesthetical appearance
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255481

Axial-transversal coupling in the free nonlinear vibrations of Timoshenko beams with arbitrary slenderness and axial boundary conditions
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON. SERIES A
Autore/i: Lenci, Stefano; Rega, Giuseppe
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236481

Seismic vulnerability of ancient stone arches by using a numerical model based on the Non-Smooth Contact Dynamics method
ENGINEERING STRUCTURES
Autore/i: Lancioni, Giovanni; Gentilucci, Davide; Quagliarini, Enrico; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236480

Seismic performance of precast reinforced concrete buildings with dowel pin connections
JOURNAL OF BUILDING ENGINEERING
Autore/i: Clementi, F.; Scalbi, A.; Lenci, S.
Classificazione: 1 Contributo su Rivista
Abstract: A key aspect in determining the seismic performance of industrial Precast Structures (PS) are the connections between precast elements. The main issue is the capacity of beam-column connections to allow relative displacements without losing beam seating, and to transfer lateral horizontal forces from the beam to the column, without losing load carrying capacity. Referring to a case study based on an industrial PS located in Italy, this work critically investigates the influence of different variables on the connection behaviour, as well as the results of the different safety assessment approaches. Attention has been paid to provide a comparison between different (linear and nonlinear, static and dynamic) analyses with both lumped and diffused nonlinear models. The analyses highlight the importance of the connection between members in the seismic upgrade of existing PS, and the minor role of the mechanical slenderness of the column when considering weak connections.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236346

Dynamics of windscreen wiper blades: Squeal noise, reversal noise and chattering
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
Autore/i: Lancioni, Giovanni; Lenci, Stefano; Galvanetto, Ugo
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236479

An efficient parallel implementation of cell mapping methods for MDOF systems
NONLINEAR DYNAMICS
Autore/i: Belardinelli, Pierpaolo; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246677

Assessment of seismic behaviour of heritage masonry buildings using numerical modelling
JOURNAL OF BUILDING ENGINEERING
Autore/i: Clementi, F.; Gazzani, V.; Poiani, M.; Lenci, S.
Classificazione: 1 Contributo su Rivista
Abstract: The paper analyzes the seismic vulnerability of the historical complex of “San Francesco” located in Cagli, Marche Region, Italy. It provides both advanced 3D modelling with solid elements and equivalent frame modelling. The building is composed of a church and a monastery used as a lower secondary school, and preservation and maintenance of its structural efficiency are of primary importance. The global structural behaviour and dynamic properties of the compound have been evaluated using the Finite Element Modelling (FEM) technique, where the nonlinear behaviour of masonry has been taken into account by proper constitutive assumptions. A sensitivity analysis is done to evaluate the effect of the choice of the control point on the value of seismic risk index, by varying the stiffness of the floors and the effects of different knowledge levels. The aim of the paper is to emphasize the importance of thorough knowledge of historic buildings in order to understand the real seismic behaviour of a structure, to detect common vulnerability of this type of building, the knowledge of which is necessary to design restorations aimed at improving the seismic behaviour of masonry buildings. Some comparisons with the Equivalent Frame Method (EFM) are also presented.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/238685

Seismic behavior of an Italian Renaissance Sanctuary: Damage assessment by numerical modelling
Proceedings INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2016 (ICCMSE 2016)
Autore/i: Clementi, F.; Nespeca, A.; Lenci, S.
Editore: AIP Publishing
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The paper deals with modelling and analysis of architectural heritage through the discussion of an illustrative case study: the Medieval Sanctuary of Sant'Agostino (Offida, Italy). Using the finite element technique, a 3D numerical model of the sanctuary is built, and then used to identify the main sources of the damages. The work shows that advanced numerical analyses could offer significant information for the understanding of the causes of existing damage and, more generally, on the seismic vulnerability.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/241773

Nonlinear Free Vibrations of Planar Elastic Beams: A Unified Treatment of Geometrical and Mechanical Effects
IUTAM Symposium Analytical Methods in Nonlinear Dynamics
Autore/i: Lenci, Stefano; Rega, Giuseppe
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246851

Numerical model upgrading of a historical masonry palace monitored with a wireless sensor network
INTERNATIONAL JOURNAL OF MASONRY RESEARCH AND INNOVATION
Autore/i: Pierdicca, A.; Clementi, F.; Isidori, D.; Concettoni, E.; Cristalli, C.; Lenci, S.
Classificazione: 1 Contributo su Rivista
Abstract: Seismic protection and vulnerability reduction are very relevant issues in European regions, such as Italy, characterised by the presence of a large stock of heritage structures. This increased the interest in structural health monitoring as a powerful tool to quantify and reduce uncertainties regarding the structural performance of buildings. Monitoring can be successfully implemented in some cases as an alternative to interventions or to control the medium- and long-term effectiveness of already applied strengthening solutions. Recently, the use of wireless sensor networks (WSN) as a new kind of architecture for structural monitoring systems has been explored. A WSN is usually a flexible solution with minor costs associated, especially if the network is composed by cheap devices. In this framework, this work details the main results obtained in the context of the 'Palazzo Comunale di Castelfidardo' monitoring project with WSN, with the aim to get an accurate numerical model (NM) that simulates the dynamic behaviour of the whole structure. An iterative approach to perform the manual tuning of the NM is proposed, using as calibration parameters not only mechanical entities, but also boundary conditions. Finally, a comparison between the structural responses, obtained with experimental analysis, and the updated NM is provided.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/233364

An overview of different asymptotic models for anisotropic three-layer plates with soft adhesive
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Autore/i: Serpilli, Michele; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Abstract: We give an overview of the possible asymptotic models for a layered plate with soft adhesive. More specifically, we study the mechanical behavior of an anisotropic nonhomogeneous linearly elastic three-layer plate with soft adhesive, including the inertia forces, by means of the asymptotic expansion method. By defining a small parameter ε, associated with the size and the stiffness of the intermediate layer, we derive various limit models and their corresponding limit problems, by varying the thickness and rigidity ratios of the adherents and the adhesive layers.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/229786

Confinement of brick masonry columns using basalt fibres ropes
Structural Analysis of Historical Constructions. Anamnesis, diagnosis, therapy, controls
Autore/i: Monni, F.; Quagliarini, E.; Greco, F.; Lenci, S.
Editore: Taylor&Francis CRC/Balkema Press
Luogo di pubblicazione: London
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/259950

A comprehensive analysis of hardening/softening behaviour of shearable planar beams with whatever axial boundary constraint
MECCANICA
Autore/i: Lenci, S.; Clementi, F.; Rega, G.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236477

Analytical Control of Homoclinic Bifurcation of the Hilltop Saddle in a Noncontact Atomic Force Microcantilever
IUTAM Symposium Analytical Methods in Nonlinear Dynamics
Autore/i: Settimi, Valeria; Rega, Giuseppe; Lenci, Stefano
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246852

Damage detection in a precast structure subjected to an earthquake: A numerical approach
ENGINEERING STRUCTURES
Autore/i: Pierdicca, A.; Clementi, F.; Maracci, D.; Isidori, D.; Lenci, S.
Classificazione: 1 Contributo su Rivista
Abstract: Seismic risk mitigation is a relevant issue in European regions, such as Italy, characterized by the presence of a large stock of vulnerable existing industrial buildings. Through a case study, the article proposes an integrated novel approach for the diagnosis of structures after a seismic event. The suggested monitoring system is based on recording the accelerations of a real structure during an earthquake and on their introduction as input into a Numerical Model (NM), suitably tuned, to outline a possible post-earthquake scenario. The leading idea of this approach is to provide an estimation of the health and remaining life of monitored structures and to detect and quantify the damage, some of the crucial issues of Structural Health Monitoring (SHM). The technique is applied to a real structure, an industrial building liable to some seismic vulnerabilities. The structure has never been subjected to an earthquake, so the actual accelerations could not be recorded. For this reason, they are acquired from a second NM subjected to real and simulated earthquakes.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/238684

Proof of concept of the structural health monitoring of framed structures by a novel combined experimental and theoretical approach
STRUCTURAL CONTROL & HEALTH MONITORING
Autore/i: Isidori, Daniela; Concettoni, E.; Cristalli, C.; Soria, L.; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/228377

A first parallel programming approach in basins of attraction computation
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
Autore/i: Belardinelli, Pierpaolo; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236476

Basalt fiber ropes and rods: Durability tests for their use in building engineering
JOURNAL OF BUILDING ENGINEERING
Autore/i: Quagliarini, Enrico; Monni, Francesco; Bondioli, Federica; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Abstract: Basalt is a common material used in constructions since antiquity. Nowadays its fibers (BFs) are going to be used as an alternative to glass, carbon or aramid fibers for strengthening purposes in building engineering. In particular, the use of basalt ropes on historic masonries seems to be a good solution to give them a monolithic behavior. Besides, basalt fibers reinforced polymer (BFRP) rods have emerged as a possible solution to the corrosion problems of steel reinforcement in reinforced concrete for new or damaged structures or to the strengthening of historic masonries by repointing. Anyway, there is till a lack of knowledge about their durability. Thus this paper presents durability tests performed on BF ropes and BFRP rods. The influence of water, acid and alkali aging solutions on the durability and on the mechanical strength of them was verified. In order to increase the durability in alkali environments (i.e.: concrete), a PMMA coating was also applied on the BFRP rods and its effect was assessed too. Results show that alkali environments could seriously affect the durability of BF ropes and BFRP rods, thus a suitable coating should be provided to protect them before their use on such environments.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/229771

Nonlinear vibrations of non-uniform beams
Proceedings of the 5th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering - COMPDYN 2015
Autore/i: Lenci, Stefano; Clementi, Francesco; Demeio, Lucio; Mazzilli, C. E. N.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/228130

Global control of a noncontact atomic force microcantilever
AIMETA 2015 - XXII Congresso Associazione Italiana di Meccanica Teorica e Applicata
Autore/i: Settimi, V; Rega, G; Lenci, S
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/290290

Caratteristiche Tipologiche e Vulnerabilità Sismiche degli Edifici Scolastici costruiti in Italia nel Secondo Dopoguerra
Colloqui.AT.e 2015 L'evoluzione del sapere in Architettura Tecnica
Autore/i: Maracchini, Gianluca; Clementi, Francesco; Monni, Francesco; Quagliarini, Enrico; Lenci, Stefano
Editore: Ar.Tec. Associazione Scientica per la Promozione dei Rapporti tra Architettura e Tecniche dell’Edilizia
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/245635

Seismic improvement of historical dry masonry building using baslt fibre ropes: the case of Lossetti Tower in Beura Cardezza (Italy)
REHAB 2015
Autore/i: Monni, Francesco; Quagliarini, Enrico; Lenci, Stefano; Clini, Paolo; Nespeca, Romina
Editore: Green Lines Instituto para o Desanvolvimento Sustentavel
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Dry stone masonry is a construction type widely used in many alpine regions in northern Italy. especially for vernacular and military buildings, as watchtowers. This kind of` masonry, results very weak under eccentric and horizontal loads if presents the lack of elements long enough to cross the thickness of` the masonry. In this paper is presented the design process for consolidation of “Lossetti Tower" — a medieval dry stone watchtower of about I4 meters high - using the technique of continuous basalt fibre (BF] stitching. First, a preliminary phase of knowledge of the building was developed. To better understand the masonry texture a 3D laser scanner survey of the tower was executed and to evaluate the teclmique effectiveness. Diagonal compression test on dry masonry specimens (reinforced and unreinforced), was done.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/228030

Cuciture flessibili per il rinforzo a secco di murature storiche: risultati sperimentali per azioni fuori dal piano
Colloqui.AT.e 2015
Autore/i: Scalbi, A.; Monni, F.; Quagliarini, E.; Lenci, S.
Editore: Maggioli
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255487

FEM analyses of a monumental building using a smeared approach for the fracture energy
MEMORIE ESTESE XXII CONGRESSO DELL’ASSOCIAZIONE ITALIANA DI MECCANICA TEORICA E APPLICATA
Autore/i: Clementi, Francesco; Gazzani, Valentina; Poiani, Marina; Mezzapelle, PARDO ANTONIO; Lenci, Stefano
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The paper analyses the static behaviour and the seismic vulnerability of the San Francesco ad Alto in Ancona (Italy), which is currently used as a Regional Headquarter of the Marche Region by the Italian Army. The static structural behaviour and the dynamic properties of the monastery have been evaluated using the finite element modelling technique, where the nonlinear behaviour of masonry has been taken into account by proper constitutive assumptions. A FEM approach has been used, based on the concepts of homogenized material and smeared cracking and crushing constitutive law. The capacity of the monastery to withstand lateral loads is evaluated together with the expected demands resulting from seismic actions using a nonlinear static analysis (Pushover). The comparison demand vs. capacity confirms the susceptibility of this type of building to extensive damage and possibly to collapse, as frequently observed
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/233367

Cerchiatura di colonne in muratura: nuovi materiali per l'evoluzione di una tecnica tradizionale
Colloqui.AT.e 2015
Autore/i: Monni, F.; Quagliarini, E.; Greco, F.; Lenci, S.
Editore: Maggioli
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255490

A Global Dynamics Perspective for System Safety from Macroto Nanomechanics: Analysis, Control, and Design Engineering
APPLIED MECHANICS REVIEWS
Autore/i: Rega, Giuseppe; Lenci, Stefano
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/228374

HPC Methods for Domains of Attraction Computation
ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
Autore/i: Belardinelli, Pierpaolo; Lenci, Stefano
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/269427

Structural health monitoring applications with wireless sensors on an historical masonry building
MEMORIE ESTESE XXII CONGRESSO DELL’ASSOCIAZIONE ITALIANA DI MECCANICA TEORICA E APPLICATA
Autore/i: Isidori, Daniela; Pierdicca, Alessio; Concettoni, Enrico; Cristalli, C.; Angeloni, J.; Clementi, Francesco; Lenci, Stefano
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In the last decades, the need for an effective seismic protection and vulnerability reduction of cultural heritage buildings and sites determined a growing interest in Structural Health Monitoring (SHM) as a knowledge-based assessment tool to quantify and reduce uncertainties regarding their structural performance. Monitoring can be successfully implemented in some cases as an alternative to interventions or to control the medium- and long-term effectiveness of already applied strengthening solutions. Traditional monitoring systems are composed of grids of sensors distributed along the structure to be monitored and connected to a central acquisition and processing unit through cables, and then post-processed in order to determine structure’s condition and assess a safety level. Recently, the use of wireless sensor networks (WSN) as an alternative base infrastructure for structural monitoring systems has been explored. A wireless sensor network is usually a more flexible solution (in facts, it does not require any cable deployment if the nodes are battery powered) with minor costs associated especially if the network is composed by low cost devices (e.g., MEMS sensors). Respect to a wired solution, new problems should however be considered: the synchronization between sensor nodes, the short transmission distance, the optimization of energy consumption and the selection of adequate low-cost sensors. In this framework, this work details the main results obtained in the context of the “Palazzo Comunale of Castelfidardo” monitoring project with WSN, with the aim to get an accurate numerical model that simulates the dynamic behaviour of the whole structure. A comparison between the structural responses obtained from the preliminary and an updated numerical model is proposed.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/233368

Vibration-based SHM of ordinary buildings: Detection and quantification of structural damage
Proceedings of the 15th International Design Engineering Technical Conferences and Computers&Informations in Engineering Conference IDECT/CIE 2015
Autore/i: Pierdicca, A.; Clementi, F.; Maracci, D.; Isidori, D.; Lenci, S.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: One of the most important issues in civil and in mechanical engineering is the detection of structural damages, which are defined as changes of material properties, of boundary conditions and of system connectivity, which adversely affect the system’s performances. The damage identification process generally requires establishing existence, localization, type and intensity of the damage. During its service life, a structure, besides his natural aging, can be subjected to earthquakes. These events may have a deep impact on building safety and a continuous monitoring of the structure health conditions, through Structural Health Monitoring (SHM) techniques, is necessary in many cases. Within this a background, the purpose of this work is to propose an integrated novel approach for the diagnosis of structures after a seismic event. The proposed monitoring system is based on recording the accelerations of the real structure during a seismic input, and the reintroduction of them into a numerical model, suitably tuned, in order to outline a possible post-earthquake scenario. This approach provides an estimation of the health of the building and of its residual life, and to detect and quantify the damage, some of the crucial aspects of SHM. Actually, we also get both online and self-diagnosis of the structural health. The technique is applied to a real structure, an industrial building liable of some seismic vulnerabilities. It it did not undergo an earthquake, so we have not recordered accelerations, and get them from a different numerical models subjected to the ground acceleration of a realistic earthquake.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/228090

Post-World War II Italian school buildings: typical and specific seismic vulnerabilities
JOURNAL OF BUILDING ENGINEERING
Autore/i: Clementi, F.; Quagliarini, E.; Maracchini, G.; Lenci, S.
Classificazione: 1 Contributo su Rivista
Abstract: Structures belonging to the same type and built in the same period may share similar geometrical and spatial characteristics. When these features also affect the seismic response of the buildings, they are referred to as typical seismic vulnerabilities. When a building presents one or more of these typical vulnerabilities, some general and qualitative considerations on its seismic behaviour can be made a priori, considering their actual influence on the seismic behaviour of other similar cases. In this work, we propose and apply a specific procedure based on a priori considerations to a specific building type: the post-World War II Italian Schools. To this purpose, we first improved our knowledge about this type of building, pointing out typical and specific seismic vulnerabilities by studying the standard architectural principles suggested by the main manuals and laws of that time. Then, in order to find how these typological features affect the global seismic behaviour of the examined structures, we analysed a real case study representative of the entire building type. Pushover and Nonlinear Dynamic analyses have been carried out, considering four different models, representing three different configurations that may result from different combinations of the most significant typical vulnerabilities.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227980