考虑诱发地震影响的砌体结构易损性分析  

Vulnerability analyses of masonry structure under induced earthquake

作　　者：李远宁 徐超[1] 耿飞[1] 卜春尧 温增平[1] Li Yuanning;Xu Chao;Geng Fei;Bu Chunyao;Wen Zengping(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)

机构地区：[1]中国地震局地球物理研究所,北京100081

出　　处：《地震学报》2024年第5期906-918,共13页Acta Seismologica Sinica

基　　金：国家重点研发计划课题(2020YFA0710600);中国地震局地球物理研究所基本科研业务费专项(DQJB22B27)共同资助.

摘　　要：为揭示诱发地震和天然地震对建筑结构影响及其破坏概率分布的影响,本文以我国典型砌体结构为研究对象,开展了考虑诱发地震影响的易损性研究。首先建立了典型三层和六层砌体结构分析模型,然后以40条震级和震中距都接近的天然地震地震动和诱发地震地震动为输入开展Pushover分析,分别建立基于峰值加速度PGA和结构基本周期加速度反应谱值Sa的易损性曲线,最后采用循环往复加载方法对两次诱发地震作用下的结构倒塌易损性进行了分析讨论。结果表明:当以PGA作为易损性输入地震动参数时,天然地震地震动作用下的易损性显著高于诱发地震地震动;当以Sa作为易损性输入地震动参数时,三层砌体结构由于以基本振型为主导,在两类地震动作用下其易损性曲线比较接近,而六层砌体结构高阶振型由于对结构地震响应具有一定影响,且诱发地震地震动的高频成分较天然地震地震动丰富,因此六层砌体结构在诱发地震地震动作用下的易损性高于天然地震。此外,对两次诱发地震作用下的砌体结构易损性分析结果表明两次地震作用下结构的损伤概率明显增加。The impact of earthquake induced by shale gas mining has attracted the attention of the government,academia and the public.It is of scientific significance and application value for the prevention and control of earthquake disaster risk to carry out seismic vulnerability research of induced earthquakes.There are significant differences between induced earthquakes and natural earthquakes in ground motion characteristics,and their seismic responses to engineering structures are also very different.In order to reveal the influence of induced earthquake and natural earthquake on the seismic effects of building structure and the distribution of failure probability of masonry structure,this paper takes typical masonry structure as the research object and develops the vulnerability study considering the effects of induced earthquake.At first,analysis models of typical three-story and six-story masonry structures are established,and then 40 natural ground motions and induced seismic ground motion with similar magnitude and epicenter distances are selected as inputs to the Pushover analysis.Finally vulnerability curves based on peak ground acceleration(PGA)and basic periodic acceleration response spectrum value Sa of the structure are established respectively.The cyclic loading method is used to analyze and discuss the structural collapse vulnerability under two induced earthquakes.The analysis shows that the induced seismic ground motion contains more high frequency components,while the natural ground motion has more low frequency components,when PGA is used as the vulnerability parameter,the vulnerability of natural ground motion is significantly higher than that of induced seismic ground motion.When Sa is used as the vulnerability parameter to input ground motion,the vulnerability curves of the three-story masonry structure are close to each other under the action of two kinds of ground motions because the basic mode is dominant.However,the high-order mode of six-story masonry structure has some influence on the seismi

关 键 词：诱发地震 天然地震 砌体结构 PUSHOVER分析 地震易损性分析 

分 类 号：P315.9[天文地球—地震学] TU362[天文地球—固体地球物理学]