影响大跨悬索桥地震响应的敏感因素
|
摘要
以四渡河悬索桥为研究对象,建立了该大跨钢桁架加劲梁悬索桥的空间动力计算模型,推导了基于Leger的大质量法(LMM)和基于拟静力位移概念的多支承激励下的非线性运动方程,在此基础上对该桥的地震反应进行了空间非线性时程分析,研究了土-桩-桥相互作用和中央扣设置方式对大跨悬索桥地震响应的影响.结果表明:土-桩-桥相互作用对悬索桥地震响应的影响与地震动输入方式密切相关,受水平地震波影响较大,而受竖向地震波的影响很小;一对柔性中央扣对加劲梁的纵桥向位移和应力响应均产生不利的影响,而刚性中央扣和3对柔性中央扣对限制加劲梁的纵桥向位移的作用显著,但是由此导致了结构地震应力响应的显著增加.
In this paper,by taking the Sidu River Bridge as the example,a spatial dynamic model of long-span suspension bridges with steel truss stiffening girder is established,and the nonlinear motion equations in the multi-support excitation condition are deduced based on Leger's large-mass method(LMM) and the pseudo static displacement conception.Then,a 3D nonlinear time-history analysis of the seismic response of the bridge is performed,and the effects of soil-pile-bridge interaction and central buckle configuration on the seismic response are investigated.The results show that the effect of soil-pile-bridge interaction on the seismic response of suspension bridge is closely related to the excitation ways of seismic ground motion and is greatly affected by the horizontal component of seismic wave but slightly affected by the vertical component,that a pair of flexible central buckles has adverse effect on the longitudinal displacement and the stress response of stiffening girder,while a pair of rigid central buckles and three pairs of flexible central buckles significantly restrict the longitudinal displacement of stiffening girder although the seismic stress response of the structure greatly increases in this case.
In this paper,by taking the Sidu River Bridge as the example,a spatial dynamic model of long-span suspension bridges with steel truss stiffening girder is established,and the nonlinear motion equations in the multi-support excitation condition are deduced based on Leger's large-mass method(LMM) and the pseudo static displacement conception.Then,a 3D nonlinear time-history analysis of the seismic response of the bridge is performed,and the effects of soil-pile-bridge interaction and central buckle configuration on the seismic response are investigated.The results show that the effect of soil-pile-bridge interaction on the seismic response of suspension bridge is closely related to the excitation ways of seismic ground motion and is greatly affected by the horizontal component of seismic wave but slightly affected by the vertical component,that a pair of flexible central buckles has adverse effect on the longitudinal displacement and the stress response of stiffening girder,while a pair of rigid central buckles and three pairs of flexible central buckles significantly restrict the longitudinal displacement of stiffening girder although the seismic stress response of the structure greatly increases in this case.
引文
[1]Vincenzo S,Piero D A.Influence of low-frequency windspeed fluctuations on the aeroelastic stability of suspen-sion bridges[J].Journal of Wind Engineering and Indus-trial Aerodynamics,2003,91(10):1285-1297.
[2]Gimsing N J.Cable supported bridges[M].2nd ed.Eng-land:John Wiley&Sons,1997.
[3]Abdel-Ghaffer Ahmed M,Nazmy A S.3-D Nolinear seis-mic behavior of cable-stayed bridges[J].Journal ofStructural Engineering,1988,117(11):3456-3476.
[4]Arzoumanidis S,Shama A A,MarlowS J.The newtacomanarrows suspension bridge:critical issues in seismic anal-ysis and design[C]∥Proceedings of the 2005 StructuresCongress and the 2005 Forensic Engineering Symposium,NewYork,April 20-24,2005.NewYork:ASCE,2005,1-12.
[5]Kiureghian A D,Neuenhofer A.Response spectrum meth-od for multi-support seismic excitations[J].EarthquakeEngineering and Structural Dynamics,1992,21(3):713-740.
[6]严国敏.现代悬索桥[M].北京:人民交通出版社,2004.
[7]Cai Y X,Gould P L,Desai C S.Nonlinear analysis of 3Dseismic interaction of soil-pile-bridge systems and applica-tion[J].Engineering Structure,2000,22(2):191-199.
[8]孙利民,张晨南,潘龙,等.桥梁土-桩相互作用的集中质量模型及参数确定[J].同济大学学报,2002,30(4):409-415.Sun Li-min,Zhang Chen-nan,Pan Long,et al.Lumped-mass model and its parameters for dynamic analysis ofbridge pier-pile-soil system[J].Journal of Tongji Univer-sity,2002,30(4):409-415.
[9]Leger P,MIde I,Paultre P.Multiple-support seismic anal-ysis of large structures[J].Computers&Structures,1990,36(3):1153-1158.
[10]Clough R W,Penzien J.Dynamics of structures[M].New York:McGraw-Hill Inc,1993.
[11]张宁勇,王君杰,陆锐.土-桩-桥相互作用的集中质量模型的比较研究[J].结构工程师,2002,(1):43-48.Zhang Ning-yong,Wang Jun-jie,Nu Rui.Study on massmodels for soil-pile-bridge interaction[J].StructuralEngineers,2002,(1):43-48.
[12]范立础.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.
[13]秦权,罗颖,孙浩.悬索桥上部结构的抗震设计[J].清华大学学报:自然科学版,1998,38(12):52-56.Qin Quan,Luo Ying,Sun Hao.Seismic design of suspen-sion bridge superstructures[J].Journal of TsinghuaUniversity(Sci&Tech),1998,38(12):52-56.
[2]Gimsing N J.Cable supported bridges[M].2nd ed.Eng-land:John Wiley&Sons,1997.
[3]Abdel-Ghaffer Ahmed M,Nazmy A S.3-D Nolinear seis-mic behavior of cable-stayed bridges[J].Journal ofStructural Engineering,1988,117(11):3456-3476.
[4]Arzoumanidis S,Shama A A,MarlowS J.The newtacomanarrows suspension bridge:critical issues in seismic anal-ysis and design[C]∥Proceedings of the 2005 StructuresCongress and the 2005 Forensic Engineering Symposium,NewYork,April 20-24,2005.NewYork:ASCE,2005,1-12.
[5]Kiureghian A D,Neuenhofer A.Response spectrum meth-od for multi-support seismic excitations[J].EarthquakeEngineering and Structural Dynamics,1992,21(3):713-740.
[6]严国敏.现代悬索桥[M].北京:人民交通出版社,2004.
[7]Cai Y X,Gould P L,Desai C S.Nonlinear analysis of 3Dseismic interaction of soil-pile-bridge systems and applica-tion[J].Engineering Structure,2000,22(2):191-199.
[8]孙利民,张晨南,潘龙,等.桥梁土-桩相互作用的集中质量模型及参数确定[J].同济大学学报,2002,30(4):409-415.Sun Li-min,Zhang Chen-nan,Pan Long,et al.Lumped-mass model and its parameters for dynamic analysis ofbridge pier-pile-soil system[J].Journal of Tongji Univer-sity,2002,30(4):409-415.
[9]Leger P,MIde I,Paultre P.Multiple-support seismic anal-ysis of large structures[J].Computers&Structures,1990,36(3):1153-1158.
[10]Clough R W,Penzien J.Dynamics of structures[M].New York:McGraw-Hill Inc,1993.
[11]张宁勇,王君杰,陆锐.土-桩-桥相互作用的集中质量模型的比较研究[J].结构工程师,2002,(1):43-48.Zhang Ning-yong,Wang Jun-jie,Nu Rui.Study on massmodels for soil-pile-bridge interaction[J].StructuralEngineers,2002,(1):43-48.
[12]范立础.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.
[13]秦权,罗颖,孙浩.悬索桥上部结构的抗震设计[J].清华大学学报:自然科学版,1998,38(12):52-56.Qin Quan,Luo Ying,Sun Hao.Seismic design of suspen-sion bridge superstructures[J].Journal of TsinghuaUniversity(Sci&Tech),1998,38(12):52-56.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心