川南地区民居建筑地震易损性研究

Research on Seismic Vulnerability of Residential Buildings in Southern Sichuan

采用震害统计为主、数值模拟为辅的方法,建立了川南地区建筑物易损性分析模型。通过实地调研总结并分析了土木、砖木、砖混、框架4类民居的结构特征以及震害特征;并从川南历史地震建筑物震害相关资料中,提取并统计这4类建筑物破坏比情况的调查结果,得到各类结构的经验易损性矩阵,针对不同结构类型在不同烈度下破坏比不全的问题,采用Beta分布概率密度函数拟合法,完善了民居建筑的易损性矩阵;最后进一步拟合出了各类结构在不同烈度下的易损性曲线,为该地区震前风险评估和震后灾损评估提供科学依据。

In this paper,a building vulnerability analysis model in southern Sichuan is established by using the method of mainly statistical analysis of seismic hazards and supplemented by numerical simulation.Firstly,through field investigation,the structural characteristics and seismic damage characteristics of civil,brick wood,brick concrete and frame residential buildings are summarized and analyzed.Then,the investigation results of the damage proportion of these four types of buildings are extracted and counted from the seismic damage related data of buildings in the historical earthquake in southern Sichuan,and the empirical vulnerability matrix of various structures is obtained.In view of the imperfect failure ratio of different structural types under different intensities,this paper uses the beta distribution probability density function fitting method to improve the vulnerability matrix of residential buildings.Finally,the vulnerability curves of various structures under different intensities are further fitted,which provides a scientific basis for pre earthquake risk assessment and post earthquake disaster damage assessment in this area.