Seismic fragility assessment of load‐bearing soft‐brick unreinforced masonry piers  

作　　者：Jayaprakash Vemuri Tariq Anwar KVL Subramaniam 

机构地区：[1]Department Of Civil Engineering,École Centrale School of Engineering,Mahindra University,Telangana 500043,India [2]Department of Earth Science and Engineering(ErSE),King Abdullah University of Science and Technology,Thuwal,23955-6900,Saudi Arabia [3]Department of Civil Engineering,Indian Institute of Technology Hyderabad,Telangana 502285,India

出　　处：《Journal of Safety Science and Resilience》2022年第4期277-287,共11页安全科学与韧性（英文）

摘　　要：Unreinforced masonry(URM)made with soft bricks comprises a large percentage of the building stock in devel-oping countries.However,the poor performance of URM piers during earthquakes has led to renewed interest in understanding their behavior under lateral loads.Little experimental data is available on the seismic response,analysis,and design of URMs made of soft bricks.In this study,the micro-modeling technique is used to simulate the in-plane behavior of load-bearing,soft-brick URM piers.The parameters required in the constitutive models are obtained from material tests and used to develop a calibrated numerical model of the URM piers.Piers with various aspect ratios subjected to various axial stresses are numerically modeled to obtain monotonic and cyclic responses,and their critical displacement limit states are identified.Changes in the failure modes of masonry piers with variations in the aspect ratio and axial stress are established.Load-bearing piers exhibit three distinct failure modes:bed sliding,diagonal shear cracking,and flexure,depending on the aspect ratio and axial stress.The seismic fragility of each pier failure type is examined using nonlinear time history analyses.The results show that bed-sliding piers collapse at extremely low PGA levels.Piers failing through diagonal shear cracking also fail at low PGA levels.Flexural piers can resist seismic forces up to a slightly higher PGA level and thus are the last to collapse.The results also indicate that the effect of uncertainty in ground motions is more significant than the effect of variability in the masonry pier capacities.

关 键 词：Unreinforced masonry Soft brick Micro-modeling Nonlinear time history analyses Synthetic ground motions Seismic fragility 

分 类 号：P315.9[天文地球—地震学]