Research On Seismic Resilience Assessment Method Of Masonry Structural Buildings

Capacity-based seismic design and performance-based seismic design has gradually failed to meet the social demands.Rapid recovery after the earthquake has become the core problem of earthquake prevention and disaster reduction.Therefore,resilience-based seismic design is emerged.Resilient cities and resilient buildings have been widely studied in China,with the emergence of "Resilient urban and rural areas"goal in 2017.The concepts of "resilient urban and rural areas" and "resilience-based seismic design" have become research hotspots and trend of earthquake engineering in China.Quantitative evaluation of seismic resilience of single buildings,is a rimary need.In addition,masonry structures are widely used in China and will continue to be widely used,especially in small and medium-sized cities and rural buildings.Therefore,the evaluation of seismic resilience of masonry structures has become an urgent need to achieve "resilient urban and rural areas".Firstly,in order to provide a data foundation and "bridge" for the seismic toughness evaluation of masonry structures.the integrated finite element models of unreinforced masonry walls and constrained masonry walls were modelling,By ABAQUS.The masonry wall were divided into five levels,based on the skeleton curve of cyclic displacement loading,with the degradation rate of lateral stiffness and the degree of reduction in capacity as the indicator.Using factors that have a small impact on the deformation performance of the wall,including wall thickness,horizontal reinforcement ratio(0.07%-0.17%),and block and mortar strength,as sources of vulnerability randomness.Dividing the wall into four performance groups,based on the wall aspect ratio,opening rate,and vertical compressive stressAnd use the method based on "independent variables" to calculate the vulnerability function of masonry walls.Secondly,In order to obtain the requirements for evaluating the seismic resilience of buildings,such as the repair time index t,repair cost index c,and personnel injury index pH and pD,a calculation method based on component damage level was studied for each index.The relevant repair parameters of unreinforced masonry walls and confined masonry walls are given by Delphi method method.The method of using Monte Carlo simulation and random number to estimate the damage level of components under a given engineering requirement parameter EDP is introduced.Finally,the collapse criteria for masonry structures based on the maximum inter story displacement angle response were explored and studied.The basic process for evaluating the seismic resilience of masonry structures proposed in this article is summarized.The resilient evaluation results in the form of score were determined.And seismic resilience evaluations were conducted on one unreinforced masonry structure building and one restrained masonry structure building,using the seismic resilience evaluation method proposed in this article for masonry structures.This proves the rationality of the method proposed in this article.