不规则高层隔震结构隔震层偏心率对地震响应的影响分析
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摘要
本文分析模型为扭转效应明显且高宽比为5.6的不规则高层建筑。分析结果表明:采用隔震结构以后,原结构的基本振型由扭转振型变成了沿Y方向的平动振型,结构振动主要集中在低阶振型,结构动力特性改变为以X、Y向的整体平动为主。不同隔震层偏心率下时程分析的结果表明,在隔震层刚度中心对上部结构质量中心偏心率不同时,上部结构地震响应的变化率在5%以内,对规范规定的"隔震层刚度中心宜与上部结构的质量中心重合"的原则可适当放宽要求。
In this paper,the dynamic characteristics of general and isolated irregular high-rise with obvious torsion effect are analyzed,and the seismic response of the L-shaped building which has an aspect ratio of 5.6 is compared,using different stiffness eccentricity ratios of rubber bearings.Analysis results show that the basic vibration model turns into translation of Y direction.The structural vibration is concentrate to the lower ones and mainly of them are the translations of X and Y directions.The time history analysis results indicate that the rate of change of the seismic responds of super-structure is less than 5% with the different stiffness eccentricity ratio of the isolation layer.So the rule that the stiffness center of the isolation layer and the quality center of superstructure should coincide,maybe relaxed in some degree.
In this paper,the dynamic characteristics of general and isolated irregular high-rise with obvious torsion effect are analyzed,and the seismic response of the L-shaped building which has an aspect ratio of 5.6 is compared,using different stiffness eccentricity ratios of rubber bearings.Analysis results show that the basic vibration model turns into translation of Y direction.The structural vibration is concentrate to the lower ones and mainly of them are the translations of X and Y directions.The time history analysis results indicate that the rate of change of the seismic responds of super-structure is less than 5% with the different stiffness eccentricity ratio of the isolation layer.So the rule that the stiffness center of the isolation layer and the quality center of superstructure should coincide,maybe relaxed in some degree.
引文
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[3]Satish Nagarajaiah,Andrei M Reinhorn,Michalakis CConstantinou.Torsion in Base-isolated Structures withElastomeric Isolation Systems[J].Journal of StructuralEngineering.1993,119(10):2932～2951
[4]Arturo Tena-Colunga,Jose Luis Escamilla-Cruz.Torsional Amplification in Asymmetric Base-isolatedStructures[J].Engineering Structures,2007,29(2):237～247
[5]吴香香,李宏男.结构偏心对基础隔震结构地震反应的影响[J].地震工程与工程振动,2003,23(1):145～151Wu Xiang-xiang,Li Hong-nan.Effects of structuraleccentricity on seismic responses of base-isolatedstructures[J].Earthquake Engineering and EngineeringVibration,2003,23(1):145～151(in Chinese)
[6]李向真,向伟明,全明,徐明贵,朱小文.平扭耦联隔震体系振动台试验研究[J].工程抗震与加固改造,2010,32(3):94～98Li Xiang-zhen,Xiang Wei-ming,Quan Ming,Xu Ming-gui,Zhu Xiao-wen.Shaking Table Test of the Lateral-torsional Coupling Isolated System[J].EarthquakeResistant Engineering and Retrofitting,2010.32(3):94～98(in Chinese)
[7]GB50011—2001,建筑抗震设计规范[S]GB50011—2001,Code for Seismic Design of Buildings[S](in Chinese)
[8]CECS 126:2001,叠层橡胶支座隔震技术规程[S]CECS 126:2001,Technical Specification for Seismic-isolation with Laminated Rubber Beating Isolators[S](in Chinese)
[9]黄鑫东,刘文光,何文福.不规则高层隔震结构地震响应的影响分析[J].工程抗震与加固改造,2010,32(3):18～23Huang Xin-dong,Liu Wen-guang,He Wen-fu.Studyon Seismic Responses of Irregular Isolated High-rise[J].Earthquake Resistant Engineering andRetrofitting,2010.32(3):18～23(in Chinese)
[10]刘文光.橡胶隔震支座力学性能及隔震结构地震反应分析研究[D].北京:北京工业大学,2003Liu Wen-guang.Mechanics Properties of RubberBearings and Earthquake Response Analysis of IsolatedStructure[D].Beijing Beijing University of Technology,2003(in Chinese)
[2]Pan T C,Kelly J M.Seismic response of torsionallycoupled base isolated structures[J].Earthq.Engrg.Struc.Dyn,1982,11(6):749～770
[3]Satish Nagarajaiah,Andrei M Reinhorn,Michalakis CConstantinou.Torsion in Base-isolated Structures withElastomeric Isolation Systems[J].Journal of StructuralEngineering.1993,119(10):2932～2951
[4]Arturo Tena-Colunga,Jose Luis Escamilla-Cruz.Torsional Amplification in Asymmetric Base-isolatedStructures[J].Engineering Structures,2007,29(2):237～247
[5]吴香香,李宏男.结构偏心对基础隔震结构地震反应的影响[J].地震工程与工程振动,2003,23(1):145～151Wu Xiang-xiang,Li Hong-nan.Effects of structuraleccentricity on seismic responses of base-isolatedstructures[J].Earthquake Engineering and EngineeringVibration,2003,23(1):145～151(in Chinese)
[6]李向真,向伟明,全明,徐明贵,朱小文.平扭耦联隔震体系振动台试验研究[J].工程抗震与加固改造,2010,32(3):94～98Li Xiang-zhen,Xiang Wei-ming,Quan Ming,Xu Ming-gui,Zhu Xiao-wen.Shaking Table Test of the Lateral-torsional Coupling Isolated System[J].EarthquakeResistant Engineering and Retrofitting,2010.32(3):94～98(in Chinese)
[7]GB50011—2001,建筑抗震设计规范[S]GB50011—2001,Code for Seismic Design of Buildings[S](in Chinese)
[8]CECS 126:2001,叠层橡胶支座隔震技术规程[S]CECS 126:2001,Technical Specification for Seismic-isolation with Laminated Rubber Beating Isolators[S](in Chinese)
[9]黄鑫东,刘文光,何文福.不规则高层隔震结构地震响应的影响分析[J].工程抗震与加固改造,2010,32(3):18～23Huang Xin-dong,Liu Wen-guang,He Wen-fu.Studyon Seismic Responses of Irregular Isolated High-rise[J].Earthquake Resistant Engineering andRetrofitting,2010.32(3):18～23(in Chinese)
[10]刘文光.橡胶隔震支座力学性能及隔震结构地震反应分析研究[D].北京:北京工业大学,2003Liu Wen-guang.Mechanics Properties of RubberBearings and Earthquake Response Analysis of IsolatedStructure[D].Beijing Beijing University of Technology,2003(in Chinese)
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