地震和风耦合作用下连体高层建筑联合易损性分析方法研究  

Study on joint fragility analysis method of conjoined high-rise buildings under combined actions of earthquake and wind

作　　者：杨连森 陈鑫[1] 谈丽华 赵宝成[1] 郭一峰 YANG Lian-sen;CHEN Xin;TAN Li-hua;ZHAO Bao-cheng;GUO Yi-feng(Jiangsu Key Laboratory of Structural Engineering,Suzhou University of Science and Technology,Suzhou 215011,China;ARTS Group Co.,Ltd.,Suzhou 215021,China)

机构地区：[1]苏州科技大学江苏省结构工程重点实验室,苏州215011 [2]中衡设计集团股份有限公司,苏州215021

出　　处：《计算力学学报》2023年第6期902-911,共10页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(2178294);江苏省六大人才高峰(JZ-004);江苏省高等学校自然科学研究重大项目(19KJA430019);苏州市科技计划项目(SYG202113);江苏省研究生实践创新计划(SJCX21-1387)资助。

摘　　要：近年来,城市地标建筑的建设中,高层连体建筑越来越受到青睐,在其服役期内不可避免地受到风和地震等多种灾害作用。而单一灾害作用下的结构失效概率低估了结构损伤乃至倒塌的可能性,迫切需要多灾害作用下的结构安全性能评价方法。本文以苏州国际会议酒店的连体高层建筑为对象,开展了地震和风耦合作用下的联合易损性分析方法研究。首先,建立了地震和风耦合作用下的多灾害易损性函数和结构性能需求函数,形成了多灾害联合易损性分析方法。随后,选取了地震动记录,开展了基于数值风洞的结构风荷载模拟,并进行了单一灾害作用下的结构易损性分析。最后,基于均匀分布抽样了100组地震和风耦合作用的荷载组合,开展了结构多灾害联合易损性分析。结果表明,结构易损性随着PGA和风速的增大而增大;相比单一灾害作用,地震与风耦合作用下,结构各破坏状态的失效概率均有所增加;当风速达40 m/s时,罕遇地震作用下结构轻微破坏、中等破坏、严重破坏和倒塌破坏的概率相比仅地震作用时分别增加了1.13%,35.67%,84.00%和98.33%。本文研究为复杂高层建筑多灾害安全性能评价提供了可用工具和参考。In recent years,high-rise conjoined buildings are increasingly popular in constructing urban landmark buildings.They are inevitably affected by various disasters such as winds and even earthquakes during their service life.However,the failure probability analysis of a structure subjected to a single hazard may underestimate the possibility of structural damage and even collapse.Therefore,an evaluation method for structural safety performance under the action analysis of multiple hazards is urgently needed.Taking the conjoined high-rise building of Suzhou International Conference Hotel as example,this paper studies the joint fragility analysis method under the combined actions of earthquake and wind.Firstly,the multi-hazard fragility function and structural performance demand function under the combined action of earthquake and wind are established,and a multi-hazard joint fragility analysis method is formed.Then,ground motion records are selected,the structural wind loads are simulated based on the computational wind tunnel,and a single-hazard structural fragility analysis is carried out.Finally,100 sets of earthquake and wind load combinations are sampled based on the uniform distribution,and the multi-hazards joint fragility analysis of the structure is carried out.The results show that the structure’s fragility increases with the PGA and wind speed.As a result,the multi-hazard failure probability of each failure state of the structure increases compared with the single-hazard failure probability.When the wind speed reaches 40 m/s, the probabilities of slight damage,moderate damage,severe damage,and collapse of the structure under rare earthquakes increased by 1.13%,35.67%,84.00%,and 98.33%,respectively,compared with those subjected to earthquake only.The research in this paper provides usable tools and references for the multi-hazard safety performance evaluation of complex high-rise buildings.

关 键 词：连体高层建筑 地震作用 风荷载 多灾害耦合作用 易损性曲面 

分 类 号：TU311.3[建筑科学—结构工程] O302[理学—力学]