输入地震动维数对FPB隔震曲线桥地震反应的影响
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摘要
为了研究摩擦摆支座隔震曲线桥梁地震反应的空间耦合效应,分析了输入地震动维数对摩擦摆支座隔震曲线桥梁地震反应的影响。基于空间有限元方法,采用能考虑动轴力影响的多维耦合FPB恢复力模型,以一座2联6跨的预应力混凝土连续箱梁桥为例,输入3条强震记录,分别进行了一维、二维及三维地震动下的非线性时程反应分析及其对比分析。结果表明:输入地震动维数引起的耦合效应对隔震曲线桥梁的地震反应有重要影响;输入地震维数对支座的力-位移滞回曲线形状有较大影响;FPB隔震曲线桥的支座位移大小与输入地震动的维数有关。
In order to study the 3D coupling effect caused by seismic response of isolation curved bridge with friction pendulum bearings,the effect of input ground motion dimension on seismic response of FPB isolation curved bridge was analyzed.Based on the 3D finite element method,taking a six-span curved PC continous box girder bridge with two unions for example and inputing three strong motion records,nonlinear time-history seismic response under 1D,2D and 3D input ground motions were analysed and compared by adopting the multi-directional coupled restoring force model of FPB considering the action of axial force.Seismic response of 3D earthquake was compared with the result of unidirectional and bi-dimensional earthquake.The results show that(1) the coupling effect caused by dimension of input ground motion has considerable effect on the seismic response of FPB isolation curved bridge;(2) the effect of dimension of input ground motion on the force-displacement hysteresis curve of bearing is great;(3) the magnitude of bearing displacement relates to the dimension of input ground motion.
In order to study the 3D coupling effect caused by seismic response of isolation curved bridge with friction pendulum bearings,the effect of input ground motion dimension on seismic response of FPB isolation curved bridge was analyzed.Based on the 3D finite element method,taking a six-span curved PC continous box girder bridge with two unions for example and inputing three strong motion records,nonlinear time-history seismic response under 1D,2D and 3D input ground motions were analysed and compared by adopting the multi-directional coupled restoring force model of FPB considering the action of axial force.Seismic response of 3D earthquake was compared with the result of unidirectional and bi-dimensional earthquake.The results show that(1) the coupling effect caused by dimension of input ground motion has considerable effect on the seismic response of FPB isolation curved bridge;(2) the effect of dimension of input ground motion on the force-displacement hysteresis curve of bearing is great;(3) the magnitude of bearing displacement relates to the dimension of input ground motion.
引文
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[2]赵湘育,袁波,李广慧,等.曲线桥地震响应分析[J].世界地震工程,2011,27(3):142-145.ZHAO Xiangyu,YUAN Bo,LI Guanghui,et al.SeismicResponse Analysis of Curved Girder Bridge[J].WorldEarthquake Engineering,2011,27(3):142-145.
[3]范立础,王志强.桥梁减隔震设计[M].北京:人民交通出版社,2001.FAN Lichu,WANG Zhiqiang.Seismic Isolation Designfor Bridge[M].Beijing:China CommunicationsPress,2001.
[4]IMBSEN R A.Use of Isolation for Seismic RetrofittingBridges[J].Journal of Bridge Engineering,2001,6(6):425-438.
[5]TOBIAS D H,ANDERSON R E,HODEL C E,et al.Overview of Earthquake Resisting System Design andRetrofit Strategy for Bridges in Illinois[J].PracticePeriodical on Structural Design and Construction,2008,13(3):147-158.
[6]夏修身,陈兴冲.铁路高墩桥梁基底摇摆隔震与墩顶减震对比研究[J].铁道学报,2011,33(9):102-107.XIA Xiushen,CHEN Xingchong.Controlled Rocking andPier Top Seismic Isolation of Railway Bridge with Tall Piers[J].Journal of the China Railway Society,2011,33(9):102-107.
[7]江宜城,叶志雄,聂肃非,等.方形铅芯橡胶支座力学性能试验研究及隔震桥梁地震响应分析[J].公路交通科技,2007,24(10):94-98.JIANG Yicheng,YE Zhixiong,NIE Sufei,et al.Experimental Study of Mechanical Properties of SquareLead Rubber Bearing and Seismic Response Analysis ofIsolated Bridge[J].Journal of Highway andTransportation Research and Development,2007,24(10):94-98.
[8]王统宁,于泳波,马麟,等.地震作用下LRB隔震桥梁碰撞临界间隙分析[J].公路交通科技,2009,26(11):71-76.WANG Tongning,YU Yongbo,MA Lin,et al.Study onCritical Gap Length of Seismic Pounding for LRB IsolatedBridges[J].Journal of Highway and TransportationResearch and Developmen,2009,26(11):71-76.
[9]周绪红,戴鹏,狄谨.曲线PC箱梁桥隔震体系的非线性分析[J].中国公路学报,2008,12(1):65-71.ZHOU Xuhong,DAI Peng,DI Jin.Nonlinear Analysis ofCurved Prestressed Concrete Box Girder Bridge withSeismic Isolation System[J].China Journal of Highwayand Transport,2008,12(1):65-71.
[10]杜修力,韩强,刘文光.考虑双向耦合非线性的LRB隔震桥梁地震反应分析[J].工程力学,2008,25(3):73-79.DU Xiuli,HAN Qiang,LIU Wenguang.NonlinearSeismic Responses of Isolation Bridges of LRB with Bi-directional Coupled Model[J].Engineering Mechanics,2008,25(3):73-79.
[11]MOSQUEDA G,WHITTAKER A S,FENVES G L.Characterization and Modeling of Friction PendulumBearings Subjected to Multiple Components of Excitation[J].Journal of Structural Engineering,2004,130(3):433-442.
[12]吴陶晶,李建中,管仲国.双向耦合效应对FPS隔震桥梁地震响应的影响[J].振动与冲击,2011,30(2):119-122.WU Taojing,LI Jianzhong,GUAN Zhongguo.Bi-Directional Coupled Effect of Friction Pendulum System onSismic Responses of an Isolated Bridge[J].Journal ofVibration and Shock,2011,30(2):119-122.
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