不同场地条件下钢筋混凝土框架结构的地震反应分析  

Seismic Response Analysis of a Reinforeced Concrete Structure with Different Site Conditions

作　　者：朱纹军 陈清军[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《结构工程师》2014年第5期96-101,共6页Structural Engineers

基　　金：国家自然科学基金资助项目(50978198)

摘　　要：从"5.12"汶川强震记录中挑选出四川省自贡地形台阵8个台站和宝兴县2个台站的加速度记录,进行了不同场地条件下的地震波频谱特性分析,比较了复杂场地地形条件下的地震动差异。以某钢筋混凝土框架结构教学楼为工程背景,利用ANSYS软件建立教学楼结构的有限元模型,进行了结构动力特性分析;在此基础上,以10条不同场地条件下的地震动时程按照规范调幅后作为输入,对这一钢筋混凝土框架结构进行了地震反应分析,探讨了不同场地条件下结构地震反应的差异。结果表明:自贡地形台阵随着测站高程的增加,地震动幅值递增明显;与基岩地震波的频带分布相比较,土层地震波的频带主要集中在较低频段,土层的高频滤波效应明显;场地条件对结构地震反应的影响较为明显,高程最大的地震波作用下结构的最大剪力响应增大明显。8 seismic acceleration time history records at the Zigong stations and 2 seismic acceleration time history records from the Baoxing stations were chosen from 5.12 Wenchuan strong ground motion data for seis-mic wave spectrum characteristics analysis .Seismic wave difference was discussed based on different site con-ditions.A finite element model of a reinforced concrete frame structure was created by ANSYS .In order to simulate the structural responses at different site conditions , 10 seismic waves from different site conditions , whose amplitudes were adjusted according to the Chinese Code for Seismic Design of Buildings , were used for seismic response analysis .The influence of site condition on structural responses was discussed .The analysis indicated that the amplitude of the seismic waves increased sharply with the increase of the height for the sta -tion at Zigong .Compared with the frequency band of bedrock seismic waves , the frequency distribution of soil seismic waves contain mainly lower frequency contents .The site condition influence on structural responses was obvious and the structural shear force at a high elevation seismic wave greatly increased .

关 键 词：地形台阵记录 地震动频谱特性分析 钢筋混凝土框架结构 不同场地条件 时程分析与比较 

分 类 号：TU375.4[建筑科学—结构工程]