近断层地震作用下基于位移的震设计方法  

Safety of displacement-based seismic designs in near-fault ground motions

作　　者：卢明奇[1] 田玉基[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《哈尔滨工程大学学报》2008年第1期16-21,共6页Journal of Harbin Engineering University

基　　金：国家自然科学基金资助项目(50478063);北京交通大学科技基金项目(2006XM024)

摘　　要：近断层地震对建筑物常常造成严重的破坏,已引起了土木工程界的广泛关注.为研究其抗震设计方法,选择了35次地震,212组近断层地震记录作为统计样本,根据得到的平均弹性位移反应谱,给出了近断层地震设计弹性位移反应谱表达式,并在此基础上,给出了近断层地震设计非弹性位移反应谱计算公式.又以一悬臂式桥墩设计为例,说明了近断层地震作用下基于位移的抗震设计过程.研究结果表明:文中提出的近断层地震设计弹性位移反应谱与实际地震波平均弹性位移反应谱较为接近,所建议的近断层地震作用下基于位移的抗震设计方法较为简单有效.Near-fault ground motions often makes havoc of buildings, and thus draws a lot of attention in the field of civil engineering. In order to study the effectiveness of displacement-based seismic design methods in near-fault ground motion, 35 earthquakes and 212 near-fault ground motion records were selected as statistical samples. From the statistical response spectra of average elastic displacement, expressions of elastic displacement response spectra of near-fault ground motions were proposed. Furthermore the expressions of nonelastic displacement response spectra were also given. In order to examine the effectiveness of designs for displacement-based near-fault ground motions, a cantilever pier was taken as an example. The response spectra of elastic displacement by near-fault ground motions proposed in the paper is comparable with that of the average elastic displacement in actual earthquake waves. The stability of the pier in simulations suggests that current displacement-based seismic design methods for near-fault ground motions are simple and effective.

关 键 词：近断层地震 位移反应谱 抗震设计 位移延性系数 

分 类 号：TU311.3[建筑科学—结构工程]