汶川地区震后钢筋混凝土框架结构的地震易损性研究  

Seismic Vulnerability of Post-earthquake Reinforced Concrete Frame Structures in the Wenchuan Area

作　　者：郑山锁[1] 马德龙[1] 刘洪珠[2] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]青岛理工大学土木工程学院,山东青岛266000

出　　处：《地震工程学报》2015年第1期131-137,共7页China Earthquake Engineering Journal

基　　金：国家科技支撑计划(2013BAJ08B03);国家自然科学基金(50978218;51108376);高等学校博士学科点专项科研基金(20106120110003);陕西省科研项目(2012K12-03-01;2011KTCQ03-05;2013JC16)

摘　　要：以汶川地震为研究背景,针对震后典型钢筋混凝土框架结构进行地震易损性研究。基于Cornell理论框架结合汶川地质资料,拟合出考虑场地特点的地震危险性模型,同时定义损伤水平状态及限值指标,以概率解析易损性研究方法为基础,运用考虑地震动参数的解析易损性评估方法绘制汶川地区钢筋混凝土框架建筑的地震易损性曲线。研究结果表明:考虑地震动参数的概率解析易损性研究方法是一种有效的地震易损性评估方法;以PGA作为地震强度输入指标的结构反应,随自振周期的增大体系最大响应的相关性降低,结构各个损伤状态的失效概率均随之增大。The purpose of this study was to analyze the seismic vulnerability of the post-earthquake reinforced concrete frame structure in Wenchuan,China.High earthquake intensities and large areas that are affected increase grievous personal and economic losses.Based on disaster investigations,reinforced concrete frame structures accounted for the high proportion of buildings destroyed.Researchers at Cornell University in the United States proposed a probabilistic method that considers the influence of different seismic intensities in the same area.From a quantitative standpoint,this method can evaluate the seismic hazard level of the target area within a given time period using ground motion parameters and probability analysis to facilitate the engineering seismic design process.A simplified method for assessing vulnerability based on ground motion parameters was proposed,and vulnerability curves for the reinforced concrete frame structure in Wenchuan were drawn to describe the probability of the various levels of damage.The curve between the ground motion parameters and the annual probability based on the Cornell University theory is accurate,reasonable,and somewhat conservative.This study used the finite element software OpenSEES to conduct nonlinear static and dynamic history analyses.The OpenSEES software is widely used because of advantages in its fiber model division,higher computing speed,and better accuracy.Approximately 300 samples of the structure were established using the OpenSEES software in order to perform the nonlinearstatic analysis.During the analysis,the yield displacement and the maximum story drift were chosen as a measure of the level of seismic capacity in the structure.The two-fold energy equivalent yield displacement method proposed by FEMA273 was also used to determine the yield displacement of structures and maximum story drift.Research methods that consider the probability of earthquake ground motion parameters by combining Latin hypercube sampling,nonlinear static analysis,dynamic time histor

关 键 词：地震工程 地震易损性 地震危险性 钢筋混凝土框架 

分 类 号：TU528.01[建筑科学—建筑技术科学]