汶川地震中上海高层建筑动力反应分析
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摘要
对同济大学强震监测台在汶川地震中测得的地震记录进行频谱特性分析,以同济大学教学科研综合楼为研究对象,应用通用有限元软件建立计算模型,分析了该结构在这一实测地震记录作用下的响应特点,并将其与调幅后的El Centro波、Taft波和上海人工波作用下的计算结果进行了对比分析,同时探讨了远震对深覆盖场地上高层建筑的影响。结果表明:尽管汶川地震同济波的峰值加速度很小,但是2~3.5 s的长周期分量卓越性却十分突出,共振效应造成长周期的高层建筑地震反应明显。
The characteristics of frequency spectrum of seismic acceleration records during Wenchuan Earthquake obtained by the strong earthquake monitoring station in Tongji University were analyzed.Then,the seismic responses of the Teaching and Research Building in Tongji University were computed based on a calculating model in the finite element software.Furthermore,the results were compared with those data produced under amplitude modulated El Centro wave,Taft wave and Shanghai artificial wave.Finally,authors essentially discussed the effect of a distant earthquake on the high-rise buildings over the deep overburden site.The results show that long period component in Tongji wave in Wenchuan Earthquake is very remarkable.Therefore,the resonance effect leads to obvious seismic responses of the high-rise buildings with long fundamental period although its peak acceleration is very small.
The characteristics of frequency spectrum of seismic acceleration records during Wenchuan Earthquake obtained by the strong earthquake monitoring station in Tongji University were analyzed.Then,the seismic responses of the Teaching and Research Building in Tongji University were computed based on a calculating model in the finite element software.Furthermore,the results were compared with those data produced under amplitude modulated El Centro wave,Taft wave and Shanghai artificial wave.Finally,authors essentially discussed the effect of a distant earthquake on the high-rise buildings over the deep overburden site.The results show that long period component in Tongji wave in Wenchuan Earthquake is very remarkable.Therefore,the resonance effect leads to obvious seismic responses of the high-rise buildings with long fundamental period although its peak acceleration is very small.
引文
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[2]王元清,黄怡,石永久,等.超高层钢结构建筑动力特性与抗震性能的有限元分析[J].土木工程学报,2006,39(5):65-71.WANG Yuan-qing,HUANG Yi,SHI Yong-jiu,et al.Finite Element Analysis on Dynamic Characteristicsand Seismic Resistance of Super High-rise SteelStructures[J].China Civil Engineering Journal,2006,39(5):65-71.
[3]GB 50011—2001,建筑抗震设计规范[S].GB 50011—2001,Code for Seismic Design of Build-ings[S].
[4]郭颖.建筑抗震设计规范实施手册[M].长春:吉林科学技术出版社,2002.GUO Ying.Enforcement Manual of Code for SeismicDesign of Buildings[M].Changchun:Jilin Science&Technology Publishing House,2002.
[5]韦承基,史铁花,薛彦涛.合理振型数的确定及扭转振型判定[J].工程抗震,2002(4):1-9.WEI Cheng-ji,SHI Tie-hua,XUE Yan-tao.Decisionof Reasonable Mode Number and Judgment of Tor-sion Mode[J].Earthquake Resistant Engineering,2002(4):1-9
[6]卞朝东,李爱群,娄宇,等.高层连体结构振型及其参与系数的分析[J].建筑科学,2002,18(4):20-24.BIAN Chao-dong,LI Ai-qun,LOU Yu,et al.Analysisof Vibration Modes and Participating Coefficients forHigh-rise Connecting Structure[J].Building Science,2002,18(4):20-24.
[7]李杰,李国强.地震工程学导论[M].北京:地震出版社,1992.LI Jie,LI Guo-qiang.Introduction to Earthquake En-gineering[M].Beijing:Earthquake Publishing House,1992.
[8]吕西林,周德源,李思明,等.建筑结构抗震设计理论与实例[M].上海:同济大学出版社,2002.LU Xi-lin,ZHOU De-yuan,LI Si-ming,et al.Theoryand Example About Seismic Design of Building Struc-tures[M].Shanghai:Tongji University Press,2002.
[9]徐永基.结构设计有关问题的探讨(四)[J].陕西建筑,2006(4):8-12.XU Yong-ji.Discussion of Related Problems on Struc-ture Design(Four)[J].Shaanxi Architecture,2006(4):8-12.
[10]杨文星,罗少锋.单自由度体系地震能量反应的计算[J].西安科技大学学报,2006,26(1):40-43.YANG Wen-xing,LUO Shao-feng.Calculation ofSeismic Energy Response of Single Degree of Free-dom System[J].Journal of Xi an University of Scienceand Technology,2006,26(1):40-43.
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