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特殊长周期地震动作用下超限高层建筑结构地震响应分析*
韩建平1,2,石金辉1,2
摘 要

(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 兰州理工大学西部土木工程防灾减灾教育部工程研究中心, 兰州 730050)

[摘要]近断层脉冲型地震动和远场类谐和地震动是两类特殊的长周期地震动,对这两类地震动作用下长周期结构特别是超限结构响应的对比研究还很少。以集集地震动记录为数据基础,各选取10条具有代表性的近断层脉冲型地震动记录和远场类谐和地震动记录,首先对两类地震动的频谱特性进行了对比研究,分析了两类地震动的特点,在此基础上,以所选取的这两类地震动分别作为输入,对一个超限高层结构分别进行了8度(0-2g)多遇水准地震作用下的弹性时程分析和罕遇水准地震作用下的弹塑性时程分析,并对两类特殊长周期地震动作用下的结构位移响应和加速度响应结果做了比较研究。结果表明,近断层脉冲型地震动和远场类谐和地震动作用下结构的最大层间位移角都接近规范限值甚至超出限值,远场类谐和地震动作用下的结构位移响应和加速度响应都大于近断层脉冲型地震动输入下的相应响应。因此,对长周期结构进行抗震性能分析时,选择远场类谐和地震动更加偏于安全。

[关键词]长周期结构; 近断层脉冲型地震动; 远场类谐和地震动; 反应谱; 时程分析; 超限高层建筑

中图分类号:TU352-1文献标识码:A文章编号:1002-848X(2017)05-0072-05

 

Seismic response analysis of an out-of-code high-rise building structure under special long-period ground motion

Han Jianping1, 2, Shi Jinhui1, 2

(1 Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China; 2 Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China)

Abstract:Near-fault pulse-type ground motion and far-field harmonic-like ground motion are two kinds of specific long-period ground motions. The comparative studies on seismic responses of long-period structures under these two types of ground motions are rare, especially for out-of-code high-rise buildings. Based on the data of Chi-Chi earthquake records, 10 representative near-fault pulse-type ground motion records and far-field harmonic-like ground motion records were selected respectively. First of all, the spectrum properties and characteristics of two types of ground motion were analyzed and compared.Based on this, the two types of selected long-period ground motion records were taken as inputs to carry out elastic time-history analysis under frequent earthquake action and elastic-plastic time-history analysis under rare earthquake action on an out-of-code high-rise building in 8-degree seismic fortification region with basic ground acceleration of 0.2g. And the results of displacement response and acceleration response were  compared and analyzed for the structure under two kinds of special long-period ground motions. The results show that the maximum interstroy drift ratios under these two types of long-period ground motion are close to code limited value or even beyond the limited value. And the structural displacement response and acceleration response under soft soil far-field harmonic-like ground motions are higher than the corresponding responses under near-fault pulse-type ground motions. It indicates that it is more secure for long-period structures to choose far-field harmonic-like ground motions to investigate their seismic performances.

Keywords:long-period structure; near-fault pulse-type ground motion; far-field harmonic-like ground motion; response spectrum; time-history analysis; out-of-code high-rise building

 

*国家自然科学基金项目(51268036)。

 

作者简介:韩建平,博士,教授,博士生导师,Email:jphan@lut.cn。

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