TY - JOUR
T1 - Seismic vulnerability of URM structures based on a Discrete Macro-Element Modeling (DMEM) approach
AU - Chácara, César
AU - Cannizzaro, Francesco
AU - Pantò, Bartolomeo
AU - Caliò, Ivo
AU - Lourenço, Paulo B.
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2019/12/15
Y1 - 2019/12/15
N2 - The assessment of the seismic vulnerability of unreinforced masonry (URM) structures based on numerical modeling constitutes a difficult task due to their complex behavior, especially in the nonlinear dynamic field, and the lack of suitable, low-demanding, computational tools. In the last decades, practical statistical tools for the derivation of fragility curves have been successfully proposed mainly with reference to framed structures. This approach has been adopted also for the seismic vulnerability assessment of masonry buildings focusing on the in-plane collapse mechanisms by means of equivalent frame models. Nevertheless, the lack of computationally effective tools which involve the interaction between in-plane and out-of-plane mechanisms makes the definition of fragility curves an arduous task when it comes to existing masonry structures without box behavior. In this paper, a practical and thorough methodology for the assessment of the seismic vulnerability of URM buildings by means of analytical fragility curves is presented. This methodology presents some innovative features such as the definition of the Limit States (LSs) and their corresponding capacity based on multi-directional pushover analyses, as well as the application of nonlinear dynamic analyses, performed using a discrete macro-element modelling approach capable of simulating the main in-plane and out-of-plane responses of URM structures with a reduced computational burden. The present investigation focuses on the application of this methodology for assessing the seismic vulnerability of a brick masonry structure characterized by a strong out-of-plane failure mechanism. After a fitting process, the fragility curves were compared to the ones obtained using expert-based approaches.
AB - The assessment of the seismic vulnerability of unreinforced masonry (URM) structures based on numerical modeling constitutes a difficult task due to their complex behavior, especially in the nonlinear dynamic field, and the lack of suitable, low-demanding, computational tools. In the last decades, practical statistical tools for the derivation of fragility curves have been successfully proposed mainly with reference to framed structures. This approach has been adopted also for the seismic vulnerability assessment of masonry buildings focusing on the in-plane collapse mechanisms by means of equivalent frame models. Nevertheless, the lack of computationally effective tools which involve the interaction between in-plane and out-of-plane mechanisms makes the definition of fragility curves an arduous task when it comes to existing masonry structures without box behavior. In this paper, a practical and thorough methodology for the assessment of the seismic vulnerability of URM buildings by means of analytical fragility curves is presented. This methodology presents some innovative features such as the definition of the Limit States (LSs) and their corresponding capacity based on multi-directional pushover analyses, as well as the application of nonlinear dynamic analyses, performed using a discrete macro-element modelling approach capable of simulating the main in-plane and out-of-plane responses of URM structures with a reduced computational burden. The present investigation focuses on the application of this methodology for assessing the seismic vulnerability of a brick masonry structure characterized by a strong out-of-plane failure mechanism. After a fitting process, the fragility curves were compared to the ones obtained using expert-based approaches.
KW - Analytical fragility curves
KW - Brick masonry structure
KW - Displacement capacity
KW - HiStrA software
KW - Multi-directional pushover analysis
KW - Nonlinear dynamic analysis
UR - http://www.scopus.com/inward/record.url?scp=85073222363&partnerID=8YFLogxK
U2 - 10.1016/j.engstruct.2019.109715
DO - 10.1016/j.engstruct.2019.109715
M3 - Article
AN - SCOPUS:85073222363
SN - 0141-0296
VL - 201
JO - Engineering Structures
JF - Engineering Structures
M1 - 109715
ER -