摩擦摆基础隔震上部偏心结构地震反应影响因素分析
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摘要
对上部结构存在偏心的摩擦摆基础隔震结构进行了水平双向地震作用下的地震反应分析,研究了上部结构偏心距和抗扭刚度对结构地震反应的影响。分析表明:上部结构偏心距对上部结构和隔震层的位移反应和加速度反应均有较大影响,即使在上部结构偏心距较小时,其对结构地震反应仍有一定程度的影响;上部结构的抗扭刚度对上部结构的加速度反应影响较小,而对上部结构的位移反应影响较大;上部结构的抗扭刚度对隔震层的加速度反应和位移反应影响较小。因而,对于上部结构存在偏心的摩擦摆基础隔震结构,应减小上部结构偏心距并增大其抗扭刚度以减小摩擦摆基础隔震结构的扭转反应。
The seismic response of the structure isolated by friction pendulum system(FPS)with an asymmetric superstructure under bilateral ground motions is analyzed.The effects of the eccentricity and the torsional stiffness on the superstructure are studied.It is shown that the effect of the eccentricity of the superstructure on the displacement and the acceleration of the superstructure and the isolation layer is remarkable.Even though the eccentricity is small,the effect of which should be taken into account in the seismic design of the base-isolated structure.The effect of the torsional stiffness of the superstructure on the seismic response of the superstructure is more remarkable than that on the seismic response of the isolation layer.So the seismic response of the superstructure can be effectively diminished by decreasing the eccentricity and increasing the torsional stiffness of the superstructure.
The seismic response of the structure isolated by friction pendulum system(FPS)with an asymmetric superstructure under bilateral ground motions is analyzed.The effects of the eccentricity and the torsional stiffness on the superstructure are studied.It is shown that the effect of the eccentricity of the superstructure on the displacement and the acceleration of the superstructure and the isolation layer is remarkable.Even though the eccentricity is small,the effect of which should be taken into account in the seismic design of the base-isolated structure.The effect of the torsional stiffness of the superstructure on the seismic response of the superstructure is more remarkable than that on the seismic response of the isolation layer.So the seismic response of the superstructure can be effectively diminished by decreasing the eccentricity and increasing the torsional stiffness of the superstructure.
引文
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[3]Samali B,Wu YM,Li J C.Shake table tests on a mass eccentric model with base isolation[J].Earthquake Engineering and Structural Dynamics,2003,32(9):1353-1372.
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[7]王兴国,张松,苏幼坡.单层FPS隔震结构的平移-扭转耦合性能分析[J].地震工程与工程振动,2006,26(3):203-205.Wang Xingguo,Zhang Song,Su Youpo.Analysis of translation-torsion coupling seismic response of one-story FPS-based structures[J].Journal of Earthquake Engineering and Engineering Vibration,2006,26(3):203-205.
[8]李向真,向伟明,徐明贵,等.考虑橡胶垫双向非线性时平扭耦联隔震结构动力性能的研究[J].建筑科学,2009,25(5):1-3.Li Xiangzhen,Xiang Weiming,Xu Minggui,etc.Research on dynamic characteristics of translation-torsion coupled vibration isolation system with consideration of bidirectional nonlinearity of rubber bearing pads[J].Building Science,2009,25(5):1-3.
[9]叶昆,李黎.近断层脉冲地震作用下偏心基础隔震结构的地震反应研究[J].工程力学,2009,26(7):163-169.Ye Kun,Li Li.Research on seismic response of asymmetric base-isolated structures under near-fault pulse-like ground motions[J].Engineering Mechanics,2009,26(7):163-169.
[10]王建强,管品武,李大望.摩擦摆基础隔震结构双向地震反应分析[J].世界地震工程,2005,21(3):11-15.Wang Jianqiang,Guan Pinwu,Li Dawang.Analysis on seismic response of base-isolated structures with friction pendulumsystemunder bilateral ground motions[J].World Earthquake Engineering,2005,21(3):11-15.
[11]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.Wang Jianqiang.Analysis on multi-dimensional and lateral-torsional coupled seismic response of base-isolated structures[D].Xi’an:Xi’an Uni-versity of Architecture and Technology,2003.
[2]Tena Colunga A,Escamilla Cruzb J L.Torsional amplifications in asymmetric base-isolated structures[J].Engineering Structures,2007,29(2):237-247.
[3]Samali B,Wu YM,Li J C.Shake table tests on a mass eccentric model with base isolation[J].Earthquake Engineering and Structural Dynamics,2003,32(9):1353-1372.
[4]De la Llera J C,Almazan J L.An experimental study of nominally symmetric and asymmetric structrues isolated with the FPS[J].Earthquake En-gineering and Structural Dynamics,2003,32(6):891-918.
[5]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,2000,23(2):12-14.Jiang Yicheng,Tang Jiaxiang,Li Yuanping.Analysis of torsional seismic response for multistory frame buildings with base isolation[J].Earth-quake Resistant Engineering,2000,23(2):12-14.
[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 response of base-isolated structures[J].Journal of Earthquake Engineer-ing and Engineering Vibration,2003,23(1):145-151.
[7]王兴国,张松,苏幼坡.单层FPS隔震结构的平移-扭转耦合性能分析[J].地震工程与工程振动,2006,26(3):203-205.Wang Xingguo,Zhang Song,Su Youpo.Analysis of translation-torsion coupling seismic response of one-story FPS-based structures[J].Journal of Earthquake Engineering and Engineering Vibration,2006,26(3):203-205.
[8]李向真,向伟明,徐明贵,等.考虑橡胶垫双向非线性时平扭耦联隔震结构动力性能的研究[J].建筑科学,2009,25(5):1-3.Li Xiangzhen,Xiang Weiming,Xu Minggui,etc.Research on dynamic characteristics of translation-torsion coupled vibration isolation system with consideration of bidirectional nonlinearity of rubber bearing pads[J].Building Science,2009,25(5):1-3.
[9]叶昆,李黎.近断层脉冲地震作用下偏心基础隔震结构的地震反应研究[J].工程力学,2009,26(7):163-169.Ye Kun,Li Li.Research on seismic response of asymmetric base-isolated structures under near-fault pulse-like ground motions[J].Engineering Mechanics,2009,26(7):163-169.
[10]王建强,管品武,李大望.摩擦摆基础隔震结构双向地震反应分析[J].世界地震工程,2005,21(3):11-15.Wang Jianqiang,Guan Pinwu,Li Dawang.Analysis on seismic response of base-isolated structures with friction pendulumsystemunder bilateral ground motions[J].World Earthquake Engineering,2005,21(3):11-15.
[11]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.Wang Jianqiang.Analysis on multi-dimensional and lateral-torsional coupled seismic response of base-isolated structures[D].Xi’an:Xi’an Uni-versity of Architecture and Technology,2003.
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