GIANLUCA MARACCHINI

Pubblicazioni

GIANLUCA MARACCHINI

 

25 pubblicazioni classificate nel seguente modo:

Nr. doc. Classificazioni
13 1 Contributo su Rivista
9 4 Contributo in Atti di Convegno (Proceeding)
2 2 Contributo in Volume
1 8 Tesi di dottorato
Anno
Risorse
2021
TRM reinforced tuff and fired clay brick masonry: Experimental and analytical investigation on their in-plane and out-of-plane behavior
CONSTRUCTION AND BUILDING MATERIALS
Autore/i: Donnini, J.; Maracchini, G.; Lenci, S.; Corinaldesi, V.; Quagliarini, E.
Classificazione: 1 Contributo su Rivista
Abstract: The paper presents the results of an experimental campaign aimed at investigating the in-plane and out-of-plane behavior of tuff and fired clay brick masonry panels reinforced by a commercial, not yet tested, Textile Reinforced Mortar (TRM) system. The TRM, consisting of hydraulic lime mortar coupled with a bidirectional glass fabric (total thickness of 30 mm), was applied on both sides of the panels and connected through stainless-steel helical bars. First, a mechanical characterization of the TRM system was carried out, according to recent guidelines (AC434 and CNR-DT215) by means of tensile tests and single-shear bond tests on the two different substrates. Then, the effectiveness of the reinforcement was investigated through uniaxial compression, diagonal compression and three-point bending tests on masonry panels. After that, experimental results were compared to the predictions of recent guidelines and analytical models available in the literature, by using the mechanical parameters obtained from the TRM mechanical characterization. TRM showed to be very effective in increasing the in-plane shear strength of tuff panels, of about 170%, whereas in the case of fired clay brick ones the increase was limited to 33%. Besides, the diagonal compression strength of reinforced specimens seemed to be strongly influenced by the mortar matrix, instead of by the fabric reinforcement, as it usually happens i.e. for Fabric Reinforced Cementitious Matrix (FRCM) systems. Thus, novel simplified analytical formulations to predict the shear strength of reinforced panels by only considering the contribution of the TRM matrix were provided, discussed and compared to current analytical approaches for FRCM systems. As regards the out-of-plane behavior, the TRM system significantly increased the out-of-plane bending strength and ductility of both tuff and fired clay brick panels. The applicability of current analytical approaches, as well as possible amendments, was also investigated. Finally, the compressive behavior of the walls was not substantially modified by the reinforcement, reasonably due to the low axial stiffness of the connectors and, to a minor extent, because they were dry inserted within the masonry and simply folded over the glass fabric.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/287962 Collegamento a IRIS

2021
Proprietà termiche delle murature
U & C. UNIFICAZIONE E CERTIFICAZIONE
Autore/i: Maracchini, G.; Di Giuseppe, E.
Classificazione: 1 Contributo su Rivista
Abstract: The recently revised European standard EN 1745 describes methods for the determination of the thermal conductivity of solid masonry units, mortars, masonry units with formed voids and “composite” masonry units, i.e. masonry unit incorporating additional material in the voids, such as thermal insulation. The determination of the “dry” and “design” thermal conductivity values can be defined based on tabulated data, measurements, calculations or a combination of these. The main novelty of the new version lies in the inclusion of a method for the determination of the thermal design values of composite masonry elements. More details in this article.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/287591 Collegamento a IRIS

2021
A Software Tool for a Stochastic Life Cycle Assessment and Costing of Buildings’ Energy Efficiency Measures
SUSTAINABILITY
Autore/i: Baldoni, Edoardo; Coderoni, Silvia; Di Giuseppe, Elisa; D’Orazio, Marco; Esposti, Roberto; Maracchini, Gianluca
Classificazione: 1 Contributo su Rivista
Abstract: This article presents a novel software tool for the assessments of life-cycle environmental impacts and costs, which is aimed to support decision-making in the design phase of retrofit interventions in the building sector. By combining Life Cycle Costing (LCC) and Life Cycle Assessment (LCA) calculations and functionalities, this tool allows evaluating the long-term trade-offs between economic and environmental performance of investment projects in energy efficiency for buildings, while accounting for uncertainties in input parameters and economic scenarios. A major novelty of the software tool is the stochastic nature of both the LCC and LCA dimensions. The LCA is implemented with Monte-Carlo methods, while the LCC accounts for the probabilistic interdependence of macroeconomic variables over time. The software also includes advanced specific tools for parametrization and sensitivity analysis. Exemplary applications are presented in order to illustrate the novelty and the functionalities of the software tool.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/291436 Collegamento a IRIS

2021
Un nuovo strumento per analisi di incertezza e sensibilità su strategie di mitigazione del fenomeno Isola di Calore Urbana
Design and construction - Tradition and innovation in the practice of architecture. Progetto e Costruzione - Tradizione ed innovazione nella pratica dell’architettura
Autore/i: Maracchini, G.; Latini, A.; Di Giuseppe, E.; D’Orazio, M.
Editore: Edicom Edizioni
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/292217 Collegamento a IRIS

2021
Proprietà termiche della muratura e dei suoi componenti: l’aggiornamento della UNI EN 1745
COSTRUIRE IN LATERIZIO
Autore/i: Maracchini, Gianluca; Giuseppe, Di
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/290615 Collegamento a IRIS

2021
Il BIM nelle simulazioni energetiche di edifici: interoperabilità nel processo BIM-to-BEM
COSTRUIRE IN LATERIZIO
Autore/i: Maracchini, G.; Di Giuseppe, E.; D’Orazio, M
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/292214 Collegamento a IRIS

2020
Approcci probabilistici alla valutazione dei costi globali di interventi di miglioramento sismico di edifici
New Horizons for Sustainable Architecture- Nuovi orizzonti per l’architettura sostenibile
Autore/i: Maracchini, G.; Di Giuseppe, E.; Stazi, F.; D’Orazio, M.
Editore: Edicom Edizioni
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/286249 Collegamento a IRIS

2020
Experimental investigation on the durability of a novel lightweight prefabricated reinforced-EPS based construction system
CONSTRUCTION AND BUILDING MATERIALS
Autore/i: D'Orazio, Marco; Stipa, Pierluigi; Sabbatini, Simona; Maracchini, Gianluca
Classificazione: 1 Contributo su Rivista
Abstract: This paper investigates the durability of a low-cost construction system named HOMEDONE developed to realize affordable and also temporary housing solutions. The system is based on the assembly of 3D-reinforced EPS panels externally topped off with a multi-layer rendering system. Similar technologies showed durability issues, especially in hot climates, due to the thermal and hygrometric stresses of the thin finishing layers when coupled to thick EPS panels and exposed to extreme events. For this reason, in this work freeze–thaw and wet/drying-UV aging tests on HOMEDONE panels with different finishing systems have been carried out, monitoring macroscopic, microscopic (ATR-FT-IR analysis) and bond strength variations due to aging. Results have pointed out good mechanical properties of the system and only small color variations of the finishing layer due to UV cycles. Then, HOMEDONE can be considered as a durable option for affordable and temporary housing solutions.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/277420 Collegamento a IRIS

2020
Internal Insulation of Historic Buildings: A Stochastic Approach to Life Cycle Costing Within RIBuild EU Project
Sustainability in Energy and Buildings
Autore/i: Di Giuseppe, Elisa; Maracchini, Gianluca; Gianangeli, Andrea; Bernardini, Gabriele; D’Orazio, Marco
Editore: Springer
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/271390 Collegamento a IRIS

2020
A Stochastic Approach to LCA of Internal Insulation Solutions for Historic Buildings
SUSTAINABILITY
Autore/i: Di Giuseppe, Elisa; D’Orazio, Marco; Du, Guangli; Favi, Claudio; Lasvaux, Sébastien; Maracchini, Gianluca; Padey, Pierryves
Classificazione: 1 Contributo su Rivista
Abstract: Internal insulation is a typical renovation solution in historic buildings with valuable façades. However, it entails moisture-related risks, which affect the durability and life-cycle environmental performance. In this context, the EU project RIBuild developed a risk assessment method for both hygrothermal and life-cycle performance of internal insulation, to support decision-making. This paper presents the stochastic Life Cycle Assessment method developed, which couples the LCA model to a Monte-Carlo simulation, providing results expressed by probability distributions. It is applied to five insulation solutions, considering different uncertain input parameters and building heating scenarios. In addition, the influence of data variability and quality on the result is analyzed, by using input data from two sources: distributions derived from a generic Life Cycle Inventory database and “deterministic” data from Environmental Product Declarations. The outcomes highlight remarkable differences between the two datasets that lead to substantial variations on the systems performance ranking at the production stage. Looking at the life-cycle impact, the general trend of the output distributions is quite similar among simulation groups and insulation systems. Hence, while a ranking of the solutions based on a “deterministic” approach provides misleading information, the stochastic approach provides more realistic results in the context of decision-making.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/274994 Collegamento a IRIS

2019
Risks and benefits of internal insulation as a measure for historic buildings energy renovation
Small Towns…from problem to resource. Sustainable strategies for the valorization of building, landscape and cultural heritage in inland areas
Autore/i: GIANANGELI, ANDREA; MARACCHINI, GIANLUCA; DI GIUSEPPE, Elisa; D’ORAZIO, MARCO
Editore: Cooperativa Universitaria Athena
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270483 Collegamento a IRIS

2019
Risks and benefits of internal insulation as a measure for historic buildings energy renovation
Small Towns…from problem to resource. Sustainable strategies for the valorization of building, landscape and cultural heritage in inland areas
Autore/i: GIANANGELI, A.; MARACCHINI, G.; DI GIUSEPPE, E.; D’ORAZIO, M
Editore: Franco Angeli
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/278526 Collegamento a IRIS

2019
An experimental and numerical study on CLT panels used as infill shear walls for RC buildings retrofit
CONSTRUCTION AND BUILDING MATERIALS
Autore/i: Stazi, F.; Serpilli, M.; Maracchini, G.; Pavone, A.
Classificazione: 1 Contributo su Rivista
Abstract: Cross Laminated Timber (CLT) has been gaining more and more attention in research and professional fields as a sustainable and promising construction system for mid- and high-rise structures. The need of buildings higher than those usually built with CLT has pushed the research towards the development of innovative hybrid techniques in which steel framed structures incorporate CLT shear walls. This concept may be potentially extended to existing RC framed buildings, where CLT infill shear walls may constitute the base of an integrated seismic and energy retrofit. In order to investigate this potentiality, this paper presents a preliminary experimental and numerical study focused on the mechanical behavior of CLT panels used as a bracing system. In particular, diagonal compression tests on 3-ply panels have been carried out, also by reproducing a direct load transmission from the RC frame to the CLT infill. A comparison with the results of similar tests on CLT panels (with a different number of layers and thickness) and with unstrengthened and strengthened masonry infill walls has been also provided. In addition, numerical simulations have been carried out, in order to evaluate the changes in RC frame lateral response when CLT infills are added. The results have proved that CLT infills may be used as a strengthening solution, allowing RC frame to reach higher lateral stiffness and peak load values respect to masonry infills.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/264726 Collegamento a IRIS

2019
An experimental investigation on the indoor hygrothermal environment of a reinforced-EPS based temporary housing solution
ENERGY AND BUILDINGS
Autore/i: D'Orazio, M.; Maracchini, G.
Classificazione: 1 Contributo su Rivista
Abstract: In a post-disaster scenario, temporary lightweight housing solutions are generally used for quickly providing disaster victims with a temporary living place. Developed for limited periods of occupation and typically built shortly with lightweight technologies, people can end up living in these buildings, especially in low-income countries, for years or even decades. Considering a possible long-occupation period, it is necessary to improve the ability of these building to grant adequate comfort even considering their temporary character. Nevertheless, few studies in the literature are focused on the indoor thermal comfort environment of these buildings. This paper shows some results of a study addressed to analyze and improve the indoor hygrothermal behavior of a novel, modular and lightweight temporary housing solution, named HOMEDONE, based on the assembly of 3D-reinforced EPS panels. After a preliminary characterization of the system in terms of in situ thermal transmittance and airtightness performance, useful to provide a reference for the numerical simulations, the indoor hygrothermal behavior of an experimental unit is monitored during the spring and the summer season. Then, hygrothermal simulations are carried out to verify the occurrence of the experimentally observed moisture-related issues in different climatic contexts and to evaluate the effectiveness of possible improvement solutions. The results showed a low in situ thermal transmittance and good airtightness performance of the HOMEDONE construction system. However, the experimental measurements revealed that, at closed opening condition, indoor air temperature and relative humidity can be very high and unacceptable during the cooling season, due to the low thermal storage capacity and the low moisture buffering/water absorption capacity of the building components. The simulations demonstrate that an internal finishing layer with adequate moisture buffering capacity can significantly reduce RH levels, preventing condensation issues and mold growth. Nevertheless, the use of the HOMEDONE unit for long periods of occupation is discouraged, especially in hot climates, unless appropriate measures to reduce the indoor overheating and to improve thermal comfort are adopted.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/278820 Collegamento a IRIS

2019
Can textile reinforced mortar (TRM) systems be really effective to increase compressive strength of masonry panels?
Key Engineering Materials
Autore/i: Donnini, J.; Maracchini, G.; Chiappini, G.; Corinaldesi, V.; Quagliarini, E.; Lenci, S.
Editore: Trans Tech Publications Ltd
Classificazione: 2 Contributo in Volume
Abstract: The use of Textile Reinforced Mortar (TRM) systems represent a valid alternative to traditional strengthening techniques, to improve mechanical strength and seismic performance of masonry buildings. Their effectiveness has been validated by several studies [1-4]. However, the TRM contribution in the mechanical behavior of masonry walls, subjected to simple compression, has not yet been fully investigated. In this study, an experimental campaign with the objective of studying the efficiency of TRM systems, applied to clay brick masonry panels, is presented. Compression tests were conducted on clay brick masonry panels with dimensions of 250x1000x1200 mm3 . Glass fiber bidirectional fabrics were applied on both sides of the panels, coupled with lime-based mortar, and connected with stainless steel helical connectors. The total thickness of the reinforcement system is 30 mm. The effect of the TRM reinforcement on the mechanical behavior of the panel is analyzed and experimental results are compared with those of unreinforced panels in terms of ultimate strength and failure modes.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270983 Collegamento a IRIS

2018
Seismic solution based on the use of cross-laminated timber (clt) panels with sliding joints as infilled earthquake bracing system for rc framed architectures
Atti del VI CONVEGNO INTERNAZIONALE SULLA DOCUMENTAZIONE, CONSERVAZIONE E RECUPERO DEL PATRIMONIO ARCHITETTONICO E SULLA TUTELA PAESAGGISTICA DIPARTIMENTO DI INGEGNERIA
Autore/i: Serpilli, M.; Maracchini, G.; Stazi, F.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Cross Laminated Timber (CLT) has gaining more and more attention in the research and professional field as a sustainable and promising construction system for mid- and high-rise structures. The need of buildings higher than that usually built with CLT has pushed the research towards the development of innovative hybrid techniques in which steel framed structures incorporate CLT shear walls. This concept may be potentially extended to existing RC framed buildings where infilled CLT shear walls may constitute the base for an integrated seismic and energy retrofit solution. In order to investigate this potentiality, this paper present a preliminary experimental study focused on the diagonal strut behaviour of CLT panels. In particular, diagonal compression tests on 3-ply panels have been carried out also by simulating the confinement effect provided by the structural frame. A comparison with the results of similar tests on CLT panels with different number of layers and thickness has been also provided. The results of this research have demonstrated that CLT panels has a higher strength and stiffness if confined. Then, the confinement effect provided by the RC frame on the infill should be accurately considered in the strengthening design.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/264724 Collegamento a IRIS

2018
Experimental and FEM Investigation of Cob Walls under Compression
ADVANCES IN CIVIL ENGINEERING
Autore/i: Quagliarini, Enrico; Maracchini, Gianluca
Classificazione: 1 Contributo su Rivista
Abstract: Earth has been used as construction material since prehistoric times, and it is still utilized nowadays in both developed and developing countries. Heritage conservation purposes and its intrinsic environmental benefits have led researchers to investigate the mechanical behaviour of this material. However, while a lot of works concern with rammed earth, CEB, and adobe techniques, very few studies are directed towards cob, which is an alternative to the more diffused rammed earth and adobe in specific geographic conditions. Due to this lack, this paper presents an experimental program aimed at assessing the failure mode and the main mechanical properties of cob earth walls (compressive strength, Young’s modulus, and Poisson’s ratio) through monotonic axial compression tests. Results show that, if compared with CEB, adobe, and rammed earth, cob has the lowest compressive strength, the lowest modulus of elasticity, and Poisson’s ratio. Differences are also found by comparing results with those obtained for other cob techniques, underlining both the high regional variability of cob and the need of performing more research on this topic. A strong dependence of material properties on loading rate and water content seems to exist too. Finally, the ability of a common analytical method used for masonry structures (an FEM macromodelling with a total strain rotating crack model) to represent the mechanical behaviour of cob walls is showed.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/259836 Collegamento a IRIS

2017
Historic masonry buildings and global modelling through the EFM: comparison between numerical simulation and real behaviour through a case study
Colloqui.AT.e 2017 - DEMOLITION OR RECONSTRUCTION?
Autore/i: Maracchini, G; Quagliarini, E; Clementi, Francesco; Monni, F.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In Europa, la valutazione sismica degli edifici storici in muratura costi-tuisce una problematica di primaria importanza, a causa dell’intrinseco valore cul-turale e delle funzioni che tali edifici mantengono ancora oggi. In questo campo vengono adoperate diverse strategie di modellazione, generalmente classificate sulla base del tipo di risposta sismica che tendono a rappresentare (locale o globale). Tra i metodi di analisi della risposta globale, la modellazione solida FEM costituisce attualmente il miglior compromesso tra accuratezza, generalità di applicazione e onere computazionale. Tuttavia, nella pratica professionale vengono generalmente preferiti metodi di modellazione semplificati, i quali richiedono un minore onere computazionale e un minor numero di parametri meccanici. Tra di essi, il modello a Telaio Equivalente (EFM) è attualmente il più diffuso. Al fine di offrire un con-tributo alla validazione di tale metodo, in questo lavoro vengono riportati i primi risultati di uno studio concernente la modellazione di un edificio storico in muratura parte di un aggregato edilizio di cui risulta disponibile lo stato di danneggiamento reale causato da un recente evento sismico. Tale edificio è caratterizzato da una disposizione delle aperture per la maggior parte regolare, fattore fondamentale nella modellazione a telaio. Le problematiche di modellazione tipiche dell’approccio a telaio vengono affrontate nello stesso modo in cui vengono affrontate nella pratica professionale. I risultati delle simulazioni numeriche vengono dunque confrontati con il danneggiamento reale riscontrato durante le fasi di rilievo post-sismico. Come atteso, le simulazioni numeriche riescono a cogliere lo stato di danneggiamento in termini di concentrazione del danno. Tuttavia, le modalità di danno riscontrate ri-sultano spesso differenti da quelle reali, specialmente nelle fasce di piano. Ciò evi-denzia la necessità di un aggiornamento del modello tramite l’aumento del livello di conoscenza della struttura.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255514 Collegamento a IRIS

2017
Vulnerabilità degli edifici esistenti: utilizzo e limiti di procedure e metodi adottati nella pratica ingegneristica per la sua valutazione e riduzione
Autore/i: Maracchini, Gianluca
Editore: Università Politecnica delle Marche
Classificazione: 8 Tesi di dottorato
Abstract: Il problema della mitigazione del rischio sismico degli edifici esistenti è in Italia una questione di primaria importanza, sia a causa dell’elevata vulnerabilità strutturale di gran parte del patrimonio edilizio esistente, sia a causa, nel caso degli edifici storici, del loro valore artistico e culturale. In un’ottica di prevenzione, date le scarse risorse disponibili e data la necessità di intervenire nel minor tempo possibile, risulta fondamentale poter disporre di strumenti affidabili che consentano di evitare inaccurate valutazioni di sicurezza sismica. La presente tesi affronta quindi alcune delle problematiche più importanti presenti nella pratica ingegneristica nella valutazione della sicurezza degli edifici esistenti, con particolare riferimento agli edifici in muratura ed in cemento armato. In particolare, dopo aver brevemente descritto le principali vulnerabilità degli edifici in muratura, viene presentata quindi una analisi critica approfondita della letteratura disponibile del metodo di modellazione a telaio equivalente. Tale metodo risulta essere oggi lo strumento di modellazione più diffuso nella pratica ingegneristica oltre ad essere consigliato da diversi codici normativi nazionali e internazionali. Da tale analisi, sono stati definiti limiti e campi d’applicazione per il suo corretto di utilizzo. In particolare, il telaio equivalente può essere utilizzato come primo approccio di tipo conservativo per lo studio della risposta sismica di edifici caratterizzati da un comportamento scatolare a prevalente risposta nel piano e con una disposizione delle aperture pressoché regolare. Diversamente da quanto accade per gli edifici esistenti in muratura, i metodi di modellazione utilizzati nella valutazione sismica degli edifici in cemento armato risultano piuttosto consolidati anche nella pratica ingegneristica. In questo caso, le maggiori fonti di incertezza presenti nella valutazione sono fornite dalla stima delle caratteristiche meccaniche delle proprietà meccaniche in situ del calcestruzzo gettato in opera. L’alta dispersione dei parametri meccanici spesso presente all’interno degli edifici esistenti in c.a., rende infatti ardua la loro rappresentazione. In questa tesi, viene proposto e applicato a sei casi studio un metodo statistico per la caratterizzazione meccanica del calcestruzzo capace di isolare alcune delle fonti di dispersione. Dall’analisi dei risultati è emerso come tale metodo sia capace di fornire una rappresentazione più accurata della dispersione effettivamente presente e di ridurre la dispersione dei risultati delle prove in situ.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/245616 Collegamento a IRIS

2017
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 Collegamento a IRIS

2017
Uses and limits of the Equivalent Frame Model on existing unreinforced masonry buildings for assessing their seismic risk: a review
JOURNAL OF BUILDING ENGINEERING
Autore/i: Quagliarini, E.; Maracchini, G.; Clementi, F.
Classificazione: 1 Contributo su Rivista
Abstract: Since the late 1970s, nonlinear static analysis have had an increasing use in the seismic assessment of existing unreinforced masonry (URM) buildings. Different modeling strategies can be used to evaluate the global seismic response of these buildings, such as the Continuous Constitutive Laws Model (CCLM) and the Equivalent Frame Model (EFM). Despite the CCLM modelling approach seems to be the most suitable at this aim, it needs many input data, that are often quite difficult to be known, and requires a high computational effort. For this reason, the EFM, which is based on strongly simplified hypotheses, is preferred in professional practice, where a small computational burden and a time- and cost-saving structural analysis by using few mechanical parameters is needed. In this paper, a review of its uses and limits is proposed, in order to identify the most critical issues and define its proper use in professional practice when applied to existing URM buildings. As a result, it is highlighted that the EFM can be reasonably used as a first conservative approach for the seismic assessment of existing URM buildings with box behaviour and quite regular opening patterns. Thus, up to now, from this review its use is encouraged in seismic analysis of existing URM buildings after providing them a reduction of their floors and roofs deformability, an adequate wall-to-floor and wall-to-roof connections and a regularization of the opening patterns.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/246021 Collegamento a IRIS

2017
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 Collegamento a IRIS

2016
Experimental assessment of concrete compressive strength in old existing RC buildings: a possible way to reduce the dispersion of DT results
JOURNAL OF BUILDING ENGINEERING
Autore/i: Quagliarini, E.; Clementi, F.; Maracchini, G.; Monni, F.
Classificazione: 1 Contributo su Rivista
Abstract: Reliable appraisal of the in situ compressive strength is a key challenge in the seismic assessment of existing RC structures, due to its high variability throughout them and because it often represents the most important strength parameter adopted in the structural analyses. For this reason, in this paper a procedure to obtain a more accurate concrete strength characterization is proposed and applied to several case studies. The method provides a reduction of test results’ variability by taking into account the influence of casting operations on it and may support existing codes for a correct in-place concrete strength evaluation.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/241351 Collegamento a IRIS

2015
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: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/245635 Collegamento a IRIS

2015
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 Collegamento a IRIS




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