上部结构(偏心)对基础滑移隔震结构平-扭耦联地震反应的影响
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摘要
对多层基础滑移隔震结构进行了水平双向地震作用下的平-扭耦联地震反应分析,研究了上部结构偏心和上部结构抗扭刚度对结构地震反应的影响,分析表明上部结构质量偏心较上部结构刚度偏心对基础滑移隔震结构地震反应的影响更大,因而应减小上部结构质量中心与隔震层质量中心和刚度中心的偏心距,以减小结构的扭转反应;当上部结构的质量偏心距较小时,其对基础滑移隔震结构的地震反应也有一定程度的影响,在结构设计时应予以考虑;上部结构的抗扭刚度对上部结构的地震反应影响较大,增大上部结构的抗扭刚度可有效减小上部结构的地震反应,但上部结构的抗扭刚度对隔震层的地震反应影响较小。
The lateral-torsional coupled seismic responses of sliding base-isolated structures under bi-axial ground excitations were analysed.The influences of eccentricity and torsional stiffness of the superstructure were studied.It is shown that the influence in the mass eccentricity in the superstructure is more remarkable than that of its stiffness eccentricity.The seismic responses of the base-isolated structure can be effectively diminished by decreasing the mass eccentricity of the superstructure.Even though the mass eccentricity is small,its influence should be take into account in design of base-isolated structure.The torsional stiffness of the superstructure has greater impact on the responses of superstructures than on the response of isolation layer.Seismic responses of superstructures can be effectively mitigated by increasing the torsional stiffness of superstructures.
The lateral-torsional coupled seismic responses of sliding base-isolated structures under bi-axial ground excitations were analysed.The influences of eccentricity and torsional stiffness of the superstructure were studied.It is shown that the influence in the mass eccentricity in the superstructure is more remarkable than that of its stiffness eccentricity.The seismic responses of the base-isolated structure can be effectively diminished by decreasing the mass eccentricity of the superstructure.Even though the mass eccentricity is small,its influence should be take into account in design of base-isolated structure.The torsional stiffness of the superstructure has greater impact on the responses of superstructures than on the response of isolation layer.Seismic responses of superstructures can be effectively mitigated by increasing the torsional stiffness of superstructures.
引文
[1]江宜城,唐家祥,李媛萍.基础隔震结构扭转振动反应分析[J].噪声与振动控制,2000,20(1):12-14.
[2]江宜城,唐家祥,李媛萍.多层框架隔震结构的地震扭转反应分析[J].工程抗震,2000,(2):12-14.
[3]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.
[4]李宏男,吴香香.偏心隔震结构扭转地震作用的简化计算公式[J].哈尔滨工业大学学报,2004,36(1):52-54.
[5]瞿伟廉,陈波.智能基础隔震结构的剪扭耦联地震反应分析[J].武汉理工大学学报,2003,25(8):39-42.
[6]A.Tena-Colunga,L.G幃mez-Sober幃n.Torsional response ofbase-isolated structures due to asymmetries in the superstruc-ture[J].Engineering Structures,2002,24:1578-1599.
[7]Bijan Samali,Wu Yimin,Li Jianchun.Shake table tests on amass eccentric model with base isolation[J].Earthquake En-gineering and Structural Dynamics,2003,32:1353-1372.
[8]Juan C.De la Llera,Jose L.Almazan.An experimentalstudy of nominally symmetric and asymmetric structrues isola-ted with the FPS[J].Earthquake Engineering and StructuralDynamics,2003,32:891-918.
[9]Keri L.Ryan,Anil K.Chopra.Estimating the seismic dis-placement of friction pendulum isolators based on non-linearresponse history analysis[J].Earthquake Engineering andStructural Dynamics,2004,33:359-373.
[10]Keri L.Ryan,Anil K.Chopra.Estimation of seismic de-mands on isolators in asymmetric buildings using non-linear a-nalysis[J].Earthquake Engineering and Structural Dynam-ics,2004,33:395-418.
[11]王建强,姚谦峰,李大望.基础滑移隔震结构双向地震反应分析[J].振动与冲击,2005,24(4):84-88.
[12]王建强.基础隔震结构多维及平-扭耦联地震反应分析[D].西安:西安建筑科技大学,2003.
[2]江宜城,唐家祥,李媛萍.多层框架隔震结构的地震扭转反应分析[J].工程抗震,2000,(2):12-14.
[3]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.
[4]李宏男,吴香香.偏心隔震结构扭转地震作用的简化计算公式[J].哈尔滨工业大学学报,2004,36(1):52-54.
[5]瞿伟廉,陈波.智能基础隔震结构的剪扭耦联地震反应分析[J].武汉理工大学学报,2003,25(8):39-42.
[6]A.Tena-Colunga,L.G幃mez-Sober幃n.Torsional response ofbase-isolated structures due to asymmetries in the superstruc-ture[J].Engineering Structures,2002,24:1578-1599.
[7]Bijan Samali,Wu Yimin,Li Jianchun.Shake table tests on amass eccentric model with base isolation[J].Earthquake En-gineering and Structural Dynamics,2003,32:1353-1372.
[8]Juan C.De la Llera,Jose L.Almazan.An experimentalstudy of nominally symmetric and asymmetric structrues isola-ted with the FPS[J].Earthquake Engineering and StructuralDynamics,2003,32:891-918.
[9]Keri L.Ryan,Anil K.Chopra.Estimating the seismic dis-placement of friction pendulum isolators based on non-linearresponse history analysis[J].Earthquake Engineering andStructural Dynamics,2004,33:359-373.
[10]Keri L.Ryan,Anil K.Chopra.Estimation of seismic de-mands on isolators in asymmetric buildings using non-linear a-nalysis[J].Earthquake Engineering and Structural Dynam-ics,2004,33:395-418.
[11]王建强,姚谦峰,李大望.基础滑移隔震结构双向地震反应分析[J].振动与冲击,2005,24(4):84-88.
[12]王建强.基础隔震结构多维及平-扭耦联地震反应分析[D].西安:西安建筑科技大学,2003.
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