工程结构在多灾害耦合作用下的研究进展  

Research progress in engineering structures subject to multiple hazards

作　　者：李宏男[1,2] 李钢[1] 郑晓伟[1,3] 付兴 刘杨[1] 董志骞[1] 吕光辉 Li Hongnan;Li Gang;Zheng Xiaowei;Fu Xing;Liu Yang;Dong Zhiqian;Lv Guanghui(Dalian University of Technology,Dalian 116024,China;Shenyang Jianzhu University,Shenyang 110168,China;China University of Mining and Techology,Xuzhou 221116,China)

机构地区：[1]大连理工大学,辽宁大连116024 [2]沈阳建筑大学,辽宁沈阳110168 [3]中国矿业大学,江苏徐州221116

出　　处：《土木工程学报》2021年第5期1-14,共14页China Civil Engineering Journal

基　　金：国家重点研发计划资助(2016YFC0701108);国家自然科学基金(52078104)。

摘　　要：我国地处亚欧板块、太平洋板块和印度洋板块之间,且疆域辽阔、海岸线绵长,这就自然形成了我国地震、强风和降雨等自然灾害频发。工程结构,包括高层建筑、村镇低矮房屋建筑群、输电塔线体系等生命线工程,在其全寿命周期内会遭受地震、强风和降雨等多种灾害的单独或同时作用。传统设计方法基于最不利荷载对结构进行设计,忽略了多种灾害耦合作用对结构全寿命周期抗灾性能的影响。文章总结了该课题组近年来在多灾害研究领域所取得的主要成果,包括:(1)根据中国强震台网中心和中国气象局数据中心提供的地震、风和降水数据,开展了极端事件单独作用和耦合作用的危险性分析;同时,提出了基于Copula函数的联合概率模型分析方法;(2)提出工程结构在多种灾害耦合作用下的性能评估和荷载修正系数计算方法;(3)开展了高层建筑在地震和强风单独作用以及同时作用下的风险分析及荷载修正系数计算;进行了村镇低矮房屋在地震和洪水耦合作用下的风险分析;对风雨耦合作用下的输电塔线体系进行了易损性分析。结果表明:(1)在考虑灾害发生概率时,不同灾害(例如,地震、强风和降雨)同时作用对结构性能评估具有显著影响;(2)由本文方法计算的荷载组合系数均不小于规范值,建议对现行规范中地震和风荷载的设计强度进行适当修正。因此,在对工程结构进行抗多灾耦合作用的性能分析和设计方法研究时,应综合考虑多种灾害的耦合效应。China lies between the Asia-Europe plate,Pacific plate and Indian Ocean plate as well as it has the long coastline,which causes our country where is prone to multiple hazards,e.g.,earthquakes,strong winds and rains.The engineering structures,especially high-rise buildings,low-rise buildings community and transmission tower systems are inevitable to be subject to individual and concurrent hazards.However,the traditional design procedure is focused on the worst-case load combination without considering the combined effects of both hazards acting simultaneously.This paper summarizes some achievements on multiple hazards by our research group,which contains the following three parts:(1)According to the earthquake,wind and precipitation data respectively provided by the China Strong Motion Network Center and China Meteorological Administration,this study conducted the individual hazard analysis,further,presented a novel Copula-based approach to model the joint probability distribution of concurrent hazards;(2)and an approach was proposed to evaluate the structural performance and calculate load modification factors against multiple hazards;(3)This study presents the following research in the field of multiple hazards:a.A probabilistic approach was proposed for risk assessment of engineering structures under individual and simultaneous(or bi-hazards for short)seismic and wind loads;b.This study discusses the research progress in the risk assessment of the low-rise village houses under concurrent earthquakes and floods;c.Finally,this paper shows the achievements in the fragility analysis of transmission tower system subject to combined wind-rain loads.The results indicate that when considering the occurrence probability ofmultihazard,simultaneous hazards(e.g.,earthquakes,strong winds and rains)will have significant impacts on the structural performance evaluation.Besides,the calculated combined factors of seismic and wind loads are larger than or equal the code-specified values.This further highlights the importance of

关 键 词：多灾害概率模型 COPULA函数 风险分析 荷载修正 高层建筑 低矮房屋 输电塔线体系 

分 类 号：TU312[建筑科学—结构工程]