考虑设计地震分组的深覆盖软土场地反应谱分析  

Response Spectra Analysisn of Site with Deep and Soft Soil Considering Design Earthquake Classification

作　　者：李英成[1] 张国彬[1] 陈清军[2] 

机构地区：[1]重庆市建筑科学研究院,重庆400000 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《工程抗震与加固改造》2014年第5期132-137,125,共7页Earthquake Resistant Engineering and Retrofitting

基　　金：科技部国家重点实验室基础研究资助项目(项目编号:SLDRCE08-B-03);国家自然科学基金资助项目(编号:50978198)

摘　　要：基于汶川地震中不同震中距处获得的基岩地震动,合成了若干条非平稳基岩地震动做为输入,以不同震中距来考虑不同的设计地震分组,通过典型深覆盖软土场地地震反应分析得到地表加速度响应,对地表加速度响应的反应谱进行了分析。分析结果表明,设计地震分组对深覆盖软土场地反应谱影响较为明显,深覆盖软土场地反应谱与现行规范设计反应谱具有较大差异。最后,对其反应谱进行了拟合分析,得到符合深覆盖软土场地特征的拟合反应谱,为深覆盖软土场地上的结构抗震设计提供参考。Several rock ground motions with different epicenter distance from Wenchuan Earthquake are selected as the original samples to simulate the non-stationary artificial ground motions. Ground surface response accelerations are got by the typical site with deep and soft soil seismic response under the non-stationary artificial ground motions input. The design earthquake classification is considered with the different epicenter distances. Based on the research of those ground surface accelerations response spectra,the results show that,the influence of design earthquake classification to site with deep and soft soil response spectra is obvious,and the site with deep and soft soil response spectra also has big difference with the seismic code regulated. At last,the response spectra characteristic parameters are derived by the fitting analysis,which could provide reference for the seismic design of structure on the site with deep and soft soil.

关 键 词：设计地震分组 深覆盖软土场地 汶川地震 反应谱分析 

分 类 号：TU435[建筑科学—岩土工程]