Estimation of load reduction factors for clay masonry walls / Francesca Da Porto in Earthquake engineering structural dynamics, Vol. 38 N° 10 (Août 2009)  

Public ISBD [article]  inEarthquake engineering structural dynamics > Vol. 38 N° 10 (Août 2009) . - pp. 1155-1174 Titre : Estimation of load reduction factors for clay masonry walls Type de document : texte imprimé Auteurs : Francesca Da Porto, Auteur ; Manuel Grendene, Auteur ; Claudio Modena, Auteur Article en page(s) : pp. 1155-1174 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : unreinforced masonry  Cyclic behaviour  Dynamic analyses  Load reduction factor Résumé : The in-plane cyclic behaviour of three types of unreinforced clay masonry was characterized by means of laboratory tests on full-scale specimens. The masonry walls were assembled with various bonding arrangements (head joints made with mortar pockets, dry head joints with mechanical interlocking, thin-layer mortar bed joints), which are not yet inserted in seismic codes. Experimental behaviour was modelled with an analytical hysteretic model able to predict lateral load-displacement curves in case of shear failure of the unreinforced walls. According to the experimental results and those of the selected analytical model, parametric study to evaluate the reduction in lateral strength demand produced by non-linear behaviour in masonry walls, i.e. the load reduction factor was carried out by non-linear dynamic analyses. The calculated values of the load reduction factor were modest. The differences in values found for the three masonry types, although consistent with them, were not great. This may indicate that, in the ultimate limit state, the type of masonry cannot significantly affect the behaviour of an entire building. DEWEY : 624.1 ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] Estimation of load reduction factors for clay masonry walls [texte imprimé] / Francesca Da Porto, Auteur ; Manuel Grendene, Auteur ; Claudio Modena, Auteur . - pp. 1155-1174. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 10 (Août 2009) . - pp. 1155-1174 Mots-clés : unreinforced masonry  Cyclic behaviour  Dynamic analyses  Load reduction factor Résumé : The in-plane cyclic behaviour of three types of unreinforced clay masonry was characterized by means of laboratory tests on full-scale specimens. The masonry walls were assembled with various bonding arrangements (head joints made with mortar pockets, dry head joints with mechanical interlocking, thin-layer mortar bed joints), which are not yet inserted in seismic codes. Experimental behaviour was modelled with an analytical hysteretic model able to predict lateral load-displacement curves in case of shear failure of the unreinforced walls. According to the experimental results and those of the selected analytical model, parametric study to evaluate the reduction in lateral strength demand produced by non-linear behaviour in masonry walls, i.e. the load reduction factor was carried out by non-linear dynamic analyses. The calculated values of the load reduction factor were modest. The differences in values found for the three masonry types, although consistent with them, were not great. This may indicate that, in the ultimate limit state, the type of masonry cannot significantly affect the behaviour of an entire building. DEWEY : 624.1 ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe

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In-plane behavior of clay masonry walls / Francesca Da Porto in Journal of structural engineering, Vol. 136 N° 11 (Novembre 2010)  

Public ISBD [article]  inJournal of structural engineering > Vol. 136 N° 11 (Novembre 2010) . - pp. 1379-1392 Titre : In-plane behavior of clay masonry walls : experimental testing and finite-element modeling Type de document : texte imprimé Auteurs : Francesca Da Porto, Auteur ; Giovanni Guidi, Auteur ; Enrico Garbin, Auteur Année de publication : 2011 Article en page(s) : pp. 1379-1392 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Unreinforced masonry In-plane loads Finite-element analyses Unit strength Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Extensive experimental research aimed at defining the in-plane cyclic behavior of three types of load-bearing masonry walls, assembled with perforated clay units, and various types of head and bed joints was carried out. Experimental behavior was modeled with four types of nonlinear finite-element models. Both macromodeling and micromodeling strategies, implementing either isotropic or orthotropic material laws, were adopted. Two simplified criteria were proposed for calibrating the models, one for defining orthotropic properties starting from perforated unit geometry and the other for defining expanded unit and interface element properties in micromodels. The procedures adopted for model calibration established the reliability of various modeling strategies. Results allow some conclusions to be drawn about the reliability of diagonal compression tests for large unit masonry, the stress distribution and different behaviors of masonry made with different head and bed joints, and the influence of unit strength on the in-plane behavior of masonry. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i11/p1379_s1?isAuthorized=no [article] In-plane behavior of clay masonry walls : experimental testing and finite-element modeling [texte imprimé] / Francesca Da Porto, Auteur ; Giovanni Guidi, Auteur ; Enrico Garbin, Auteur . - 2011 . - pp. 1379-1392. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 11 (Novembre 2010) . - pp. 1379-1392 Mots-clés : Unreinforced masonry In-plane loads Finite-element analyses Unit strength Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Extensive experimental research aimed at defining the in-plane cyclic behavior of three types of load-bearing masonry walls, assembled with perforated clay units, and various types of head and bed joints was carried out. Experimental behavior was modeled with four types of nonlinear finite-element models. Both macromodeling and micromodeling strategies, implementing either isotropic or orthotropic material laws, were adopted. Two simplified criteria were proposed for calibrating the models, one for defining orthotropic properties starting from perforated unit geometry and the other for defining expanded unit and interface element properties in micromodels. The procedures adopted for model calibration established the reliability of various modeling strategies. Results allow some conclusions to be drawn about the reliability of diagonal compression tests for large unit masonry, the stress distribution and different behaviors of masonry made with different head and bed joints, and the influence of unit strength on the in-plane behavior of masonry. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i11/p1379_s1?isAuthorized=no

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