大跨度钢桁架转换层结构的竖向地震反应分析  

Vertical seismic response analysis of a high-rise building containing a steel truss transfer story structure with large span

作　　者：吴玉华[1] 楼文娟[2] 叶小刚 

机构地区：[1]浙江工业大学之江学院,浙江杭州310024 [2]浙江大学结构工程研究所,浙江杭州310027 [3]宁波市城建设计研究院有限公司,浙江宁波315012

出　　处：《地震工程与工程振动》2011年第4期89-93,共5页Earthquake Engineering and Engineering Dynamics

摘　　要：对某一带钢桁架转换层的复杂高层结构进行了有限元建模,分别采用振型分解反应谱法、时程分析法和《建筑抗震设计规范》(GB50011-2001)的设计反应谱法对大跨高位钢桁架转换层结构的竖向地震响应进行了分析。对采用振型分解反应谱法计算此类结构响应时所要选取的振型数及振型组合方法进行了探讨,并对规范采用10%的重力荷载代表值(8度)来考虑竖向地震作用影响的规定也进行了适用性分析。结果表明:对带钢桁架转换层且平、立面不规则结构的竖向地震效应进行分析时,建议考虑振型的交叉项,采用CQC法进行组合;采用10%重力荷载代表值计算的竖向地震作用标准值对桁架部分杆件偏于不安全。A FEA model was established for a high-rise building with steel truss transfer story.The vertical seismic responses of this structure were analyzed by using the mode decomposition response-spectra method,the time history analysis method and the design response-spectra method of the Chinese Code for seismic design of buildings（GB5001-2001）.The mode number and the mode combination method,which were selected in analyzing seismic response using the mode decomposition response spectrum method,were investigated.And the applicability of one of the provisions in the Code,which considered the effect of vertical seismic action by 10% gravity load representative value,was also investigated.The results show that the cross-correlation between modal responses is proposed to be taken into account and the CQC combination method is proposed to be adopted in the analysis of vertical seismic response of large span transfer story structure with irregular elevation and/or plan design.For some members of the truss,the nominal value of vertical seismic action calculated by 10% gravity load representative value is unsafe.

关 键 词：钢桁架 转换层 竖向地震 时程分析 反应谱法 

分 类 号：P315.952[天文地球—地震学] TU973.31[天文地球—固体地球物理学]