不同地震记录选择方法下某超高层巨型框架结构能量反应分析  

Analysis on seismic energy response of super tall mega-frame structure under different ground motion record selection methods

作　　者：常磊 叶献国[2] 

机构地区：[1]广州容柏生建筑结构设计事务所,广州510170 [2]合肥工业大学土木与水利工程学院,合肥230009

出　　处：《建筑结构》2014年第2期19-24,共6页Building Structure

基　　金：国家自然科学基金重大研究计划(90715016)

摘　　要：通过三种地震记录选择方法,对某超高层巨型框架结构进行了大震作用下的弹塑性时程分析,研究了不同地震记录选择方法对巨型框架结构能量反应的影响。依据结构地震能量反应结果,分析了拟合设计加速度谱和拟合能量谱这两种地震记录选择方法对结构能量反应的影响及区别。可知谱匹配法生成地震记录在保持天然记录诸多特性的同时,可很好地反映结构设计加速度谱的特点。建议分别采用拟合能量谱法和谱匹配法选择天然记录和人工记录。算例分析表明,由于设计加速度谱在长周期段有所放大,因而长周期段基于拟合设计加速度谱选择记录会带来过大的结构能量反应,为按能量谱拟合结果的10倍左右,超高层结构设计与大震作用下分析时需予以重视。Elasto-plastic time history analysis on a super tall mega-frame structure under the rare earthquake was carried out using three ground motion record selection methods, and effects of three methods on the structure＇s energy response were compared and evaluated. Through the seismic energy response analysis results, influences of record selection methods based on fitting design acceleration response spectrum and fitting energy response spectrum were evaluated. Spectrum-matched method can maintain actual earthquake record＇s characteristics as well as reflecting the design spectrum perfectly. Fitting energy response spectrum method and spectrum-matched method were proposed to select real rare earthquake records and produce artificial earthquake record respectively. Based on calculations, design acceleration spectrum in long period was amplified artificially so exaggerated structural energy response will be resulted while using fitting design acceleration response spectrum method, and the energy response is around 10 times of that by fitting energy response spectrum method. It should be noticed in structural design and seismic analysis under rare earthquake of super tall building.

关 键 词：地震记录 超高层 巨型框架结构 地震能量 

分 类 号：TU973.19[建筑科学—结构工程]