长周期地震动输入下某超限高层结构反应分析——以汶川地震和日本东北地震记录为例  

Seismic response analysis of an out-of-code high-rise building under long-period ground motion:case studies of Wenchuan Earthquake and Japan Tohoku Earthquake records

作　　者：韩建平[1,2] 苏彦兵[1,2] 

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,兰州730050 [2]兰州理工大学防震减灾研究所,兰州730050

出　　处：《建筑结构》2014年第18期59-62,共4页Building Structure

基　　金：国家自然科学基金项目(51268036)

摘　　要：由于长周期地震动记录相对缺乏,国内外对长周期地震动作用下高层结构的地震响应研究尚不充分。选取2008年汶川地震和2011年日本东北地震中长周期分量明显的3组地震动记录,首先对其绝对加速度放大系数谱和相对位移反应谱的特性进行研究;进一步以某超限高层结构为研究对象,同时以这3组地震动记录为输入,分别进行了8度多遇地震作用下的弹性分析和罕遇地震作用下的弹塑性时程分析,提取了结构的主要地震响应指标,并与相应水准El Centro地震动记录输入下的分析结果进行了比较。对比结果表明,长周期地震动输入下结构的地震响应指标如水平最大位移和最大层间位移角明显大于普通地震动记录输入下的响应指标,因此长周期地震动对超限高层结构的影响应引起足够的重视。Due to the lack of long-period ground motion records, the influence of long-period ground motion on seismic performance of high-rise buildings is not studied sufficiently. Three suites of ground motion records with obvious long-period components from 2008 Wenchuan Earthquake and 2011 Japan Tohoku Earthquake were selected. The characteristics of their absolute acceleration amplification factor spectra and relative displacement spectrum were discussed. Furthermore, an out-of-code high-rise building was taken as case study. These suites of ground motion records were taken as inputs to carry out elastic time-history analysis under the frequent earthquake and elastic-plastic time-history analysis under the rare earthquake of the seismic fortification intensity zone 8. Main seismic response indicators were obtained and also compared with the results under the corresponding E1 Centro ground motion input cases. Comparison of the results shows that seismic responses such as maximum horizontal displacement and maximum story drift under long-period ground motion are apparently higher than the seismic responses under normal ground motion, which indicates that enough attention should be paid on the influence of long-period ground motion on the seismic performance of out-of-code high-rise buildings.

关 键 词：长周期地震动 超限高层 时程分析 地震响应 汶川地震 日本东北大地震 

分 类 号：TU352.1[建筑科学—结构工程]