不同区域多层砖砌体住宅房屋地震易损性对比分析  

Comparative analysis on seismic vulnerability of multi-story brick masonry residential buildings located in different areas of China

作　　者：鲁若帆 张令心[1] 马加路[1] LU Ruofan;ZHANG Lingxin;MA Jialu(Institute of Engineering Mechanics,China Earthquake Administration,Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration,Harbin 150080,China)

机构地区：[1]中国地震局工程力学研究所,中国地震局地震工程与工程振动重点实验室,黑龙江哈尔滨150080

出　　处：《地震工程与工程振动》2020年第5期84-96,共13页Earthquake Engineering and Engineering Dynamics

基　　金：国家重点研发计划项目(2018YFC1504602);黑龙江省头雁行动计划项目。

摘　　要：针对我国地域辽阔,各区域砖砌体房屋墙厚不同的现状,将我国按从南到北分为3个区域,并根据不同建造年代、不同层数、不同设防烈度对多层砖砌体住宅房屋进行分类,共设计了42类代表性砖砌体房屋结构;基于动力非线性地震反应时程分析,结合考虑地震动和结构不确定性的概率方法建立了该类房屋地震易损性分析方法,采用此方法得到了42类砖砌体房屋的地震易损性曲线;通过对不同区域多层砖砌体房屋地震易损性的对比分析,详细研究了不同区域该类房屋抗震性能的差异以及墙厚对该类房屋不同破坏状态的影响,得到了以下结论:墙体厚度的增加可以降低砖砌体房屋的地震易损性,提高其抗震性能;在强度较低的地震作用下,墙体越厚,结构越不容易发生破坏,且不同区域砖砌体房屋发生基本完好和轻微破坏的差异较大;在特别强烈的地震作用下,墙体越厚,结构越不容易发生毁坏现象,且不同区域砖砌体房屋发生严重破坏和毁坏的差异较大。这些结论为不同区域的多层砖砌体房屋的抗震性能评估、震害预测以及抗震设计规范的修订提供了依据。Wall thicknesses of brick masonry buildings are various in different areas of China.In order to accurately investigate the difference on seismic performance of multi-story brick masonry residential buildings in different areas,three areas were divided from south to north according to the thicknesses of exterior walls.Besides,ages of building,floor numbers and fortification intensity were also investigated as the key parameters.Therefore,42 types of representative brick masonry buildings in total were designed with the corresponding codes.Considering the uncertainty of ground motions and structural parameters by probabilistic methods,seismic vulnerability analysis processes of brick masonry buildings were carried out.Based on the results of dynamic nonlinear time-history analysis of seismic response,seismic vulnerability curves of 42 types brick masonry buildings were obtained.According the thicknesses of the walls in different areas,the following conclusions were obtained by comparing and discussing the features of seismic vulnerability of multi-story brick masonry buildings.With the increase of wall thicknesses,the seismic vulnerability of brick masonry buildings is reduced while their seismic performances are improved.With smaller seismic actions,the thicker the walls are,the lower damage probabilities the structures are,and the corresponding differences of intact and slight damage levels of brick masonry buildings are large.With extremely stronger seismic actions,the thicker the walls are,the lower destroyed damage probabilities the structures are,and the corresponding differences of severe damage and collapse of brick masonry buildings are large.These conclusions can be the basis for seismic performance evaluation,seismic damage prediction and revision of code for seismic design of multi-story brick masonry buildings in different areas.

关 键 词：多层砖砌体房屋 地震易损性 不同区域 抗震性能 墙厚 

分 类 号：P315.95[天文地球—地震学]