高层隔震结构扭转分析
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摘要
为研究高层隔震结构在地震作用下的扭转效应,用Etabs软件建立1个高层抗震结构和4个具有不同扭转特性的高层隔震结构的空间模型进行地震响应分析,以验证此原则"上部结构质量中心与隔震层刚度中心的重合与否"对结构扭转效应的影响程度,而后考察偏心高层隔震结构在偶然偏心地震作用下结构的扭转效应。结果表明:由于地震作用的减小,扭转效应要远小于原抗震结构,且隔震本身对于结构扭转效应的抑制效果要好于上述原则;扭转效应的减震率大于平动效应的减震率。布置在隔震层平面外围的铅芯橡胶隔震支座对隔震层的扭转有一定的控制作用。
To study the torsional effect of high-rise isolation structure under seismic action,with Etabs software spatial models of a high-rise seismic structure and 4 high-rise isolation structures which have different torsional properties are established,and comparative seismic response analyses of the above-metioned 5 models are done to check up the influence of "the upper structure mass center coincident with the isolation layer rigidity center or not" on the torsion inhibition of the high-rise isolation structures.Then the torsional effect of the high-rise isolation structure under accidental eccentric seismic action is observed in the case that upper structure mass center and the isolation layer rigidity center is not coincident.The results show that as the intensity of earthquakes decreases,torsion effect is far smaller than the original seismic structure and the isolation itself has better inhibitory effect to torsion than the case of the upper structure mass center coincident with the isolation layer rigidity center;the isolation rate of torsion is greater than the isolation rate of translation.Lead rubber bearings arranged in the periphery of isolation layer plane have some control effect on the torsion of isolation layer.
To study the torsional effect of high-rise isolation structure under seismic action,with Etabs software spatial models of a high-rise seismic structure and 4 high-rise isolation structures which have different torsional properties are established,and comparative seismic response analyses of the above-metioned 5 models are done to check up the influence of "the upper structure mass center coincident with the isolation layer rigidity center or not" on the torsion inhibition of the high-rise isolation structures.Then the torsional effect of the high-rise isolation structure under accidental eccentric seismic action is observed in the case that upper structure mass center and the isolation layer rigidity center is not coincident.The results show that as the intensity of earthquakes decreases,torsion effect is far smaller than the original seismic structure and the isolation itself has better inhibitory effect to torsion than the case of the upper structure mass center coincident with the isolation layer rigidity center;the isolation rate of torsion is greater than the isolation rate of translation.Lead rubber bearings arranged in the periphery of isolation layer plane have some control effect on the torsion of isolation layer.
引文
[1]Lee D M.Base isolation for torsion reduction in asymmetric structures under earthquake loading[J].Earthquake Engineering and Structural Dy-namics,1979,8(3):349-359.
[2]Pan T.C.,Kelly J.M.Seismic response of torsionally coupled base isolated structures[J].Earthquake Engineering and Structural Dynamics,1982,11(6):749-770.
[3]李慧,王文武,杜永峰,等.偏心隔震结构随机响应分析[J].兰州理工大学学报,2006,32(6):114-117.LI Hui,WANG Wenwu,DU Yongfeng,et al.Analysis of random response of eccentric vibration-isolative structures[J].Journal of Lanzhou Uni-versity of Technology,2006,32(6):114-117.
[4]李向真.平扭耦联隔震体系的简化模型及有关参数变化的计算分析[J].地震工程与工程振动,2005,25(3):163-166.LI Xiangzhen.Simplified model of the lateral-torsional coupling isolated system and its parameter analysis[J].Earthquake Engineering and Engi-neering Vibration,2005,25(3):163-166.
[5]王建强,姚谦峰.基础隔震单层偏心结构扭转地震反应分析[J].世界地震工程,2004,20(1):35-38.WANG Jianqiang,YAO Qianfeng.Analysis on torsional seismic response of one-story asymmetric structure with base isolation[J].World Earth-quake Engineering,2004,20(1):35-38.
[6]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):145-151.WU Xiangxiang,LI Hongnan.Effects of structural eccentricity on seismic responses of base-isolated structure[J].Earthquake Engineering andEngineering Vibration,2003,23(1):145-151.
[7]江宜城,唐家祥.单轴偏心的基础隔震结构扭转反应分析[J].华中理工大学学报,1999,27(6):80-82.JIANG Yicheng,TANG Jiaxiang.The torsional response analysis of the base-isolated building[J].Journal of Huazhong University of Science andTechnolog,1999,27(6):80-82.
[8]JGJ3-2002高层建筑混凝土结构技术规程[S].JGJ 3-2002 Technical Specification for Concrete Structures of Tall Building[S].
[9]GB 50011-2010建筑抗震设计规范[S].GB 50011-2010 Code for Seismic Design of Building[S].
[2]Pan T.C.,Kelly J.M.Seismic response of torsionally coupled base isolated structures[J].Earthquake Engineering and Structural Dynamics,1982,11(6):749-770.
[3]李慧,王文武,杜永峰,等.偏心隔震结构随机响应分析[J].兰州理工大学学报,2006,32(6):114-117.LI Hui,WANG Wenwu,DU Yongfeng,et al.Analysis of random response of eccentric vibration-isolative structures[J].Journal of Lanzhou Uni-versity of Technology,2006,32(6):114-117.
[4]李向真.平扭耦联隔震体系的简化模型及有关参数变化的计算分析[J].地震工程与工程振动,2005,25(3):163-166.LI Xiangzhen.Simplified model of the lateral-torsional coupling isolated system and its parameter analysis[J].Earthquake Engineering and Engi-neering Vibration,2005,25(3):163-166.
[5]王建强,姚谦峰.基础隔震单层偏心结构扭转地震反应分析[J].世界地震工程,2004,20(1):35-38.WANG Jianqiang,YAO Qianfeng.Analysis on torsional seismic response of one-story asymmetric structure with base isolation[J].World Earth-quake Engineering,2004,20(1):35-38.
[6]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):145-151.WU Xiangxiang,LI Hongnan.Effects of structural eccentricity on seismic responses of base-isolated structure[J].Earthquake Engineering andEngineering Vibration,2003,23(1):145-151.
[7]江宜城,唐家祥.单轴偏心的基础隔震结构扭转反应分析[J].华中理工大学学报,1999,27(6):80-82.JIANG Yicheng,TANG Jiaxiang.The torsional response analysis of the base-isolated building[J].Journal of Huazhong University of Science andTechnolog,1999,27(6):80-82.
[8]JGJ3-2002高层建筑混凝土结构技术规程[S].JGJ 3-2002 Technical Specification for Concrete Structures of Tall Building[S].
[9]GB 50011-2010建筑抗震设计规范[S].GB 50011-2010 Code for Seismic Design of Building[S].
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