基于LRB恢复力双向耦合的隔震桥梁非线性地震响应研究
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摘要
为了研究考虑与不考虑铅芯橡胶支座(LRB)恢复力双向耦合作用对结构地震响应的影响,采用Bouc-Wen模型模拟LRB恢复力的双向耦合特性,采用Wen模型模拟LRB恢复力的单向特性,建立了考虑与不考虑LRB恢复力双向耦合作用的两种全桥有限元模型,编制了运用Newmark时间积分法和四阶显式Runge-Kutta迭代法联合求解全桥非线性运动方程的时程分析程序。利用程序并结合算例对两种模型进行了非线性时程对比分析。分析结果表明:不考虑双向耦合作用将会对梁体位移和LRB自身位移产生过小估计;考虑双向耦合作用不会对墩顶位移、梁体加速度和墩底内力产生过大估计。
In order to investigate the different influences of taking into and taking no account of bi-directional couple for LRB restoring force interaction on structure seismic response,the Bouc-Wen model is adopted to simulate the bi-directional couple interaction for LRB restoring force,the Wen model is adopted to simulate the single-directional for LRB restoring force,the two FEA models which involved the taking into and taking no account of bi-directional couple interaction for LRB restoring force are established,the multi-dimensional and multi-support random excitation as input for two models,the time-history analyses procedure of the Newmark and the Runge-Kutta iterative strategy are used to solve the increment form nonlinear governing equation of motion is programmed.Using the procedure and combining calculation example analyses the two models between the taking into and taking no account of bi-directional couple interaction for LRB restoring force.The consequences indicate that the girder displacement and LRB displacement can be underestimated by the taking no account of bi-directional couple interaction for LRB restoring force.The pier top displacement,girder acceleration and pier bottom internal force can't be overestimated by the taking into bi-directional couple interaction for LRB restoring force.
In order to investigate the different influences of taking into and taking no account of bi-directional couple for LRB restoring force interaction on structure seismic response,the Bouc-Wen model is adopted to simulate the bi-directional couple interaction for LRB restoring force,the Wen model is adopted to simulate the single-directional for LRB restoring force,the two FEA models which involved the taking into and taking no account of bi-directional couple interaction for LRB restoring force are established,the multi-dimensional and multi-support random excitation as input for two models,the time-history analyses procedure of the Newmark and the Runge-Kutta iterative strategy are used to solve the increment form nonlinear governing equation of motion is programmed.Using the procedure and combining calculation example analyses the two models between the taking into and taking no account of bi-directional couple interaction for LRB restoring force.The consequences indicate that the girder displacement and LRB displacement can be underestimated by the taking no account of bi-directional couple interaction for LRB restoring force.The pier top displacement,girder acceleration and pier bottom internal force can't be overestimated by the taking into bi-directional couple interaction for LRB restoring force.
引文
[1]李黎,刘文静,张行.LRB体系连续梁桥的隔震性能分析[J].华中科技大学学报:自然科学版,2010,38(9):93-97.
[2]李建中,辛学忠.连续梁桥减震、隔震体系非线性地震反应分析[J].地震工程与工程振动,1998,18(3):67-73.
[3]朱东升,劳远昌,沈大元,等.LRB隔震桥梁的地震反应特点[J].工程力学,2000,18(1):119-125.
[4]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,2008,21(1):65-70.
[5]Ghobarah A,Ali H M.Seismic performance of high-waybridges[J].Engineering Structures,1998,10(3).
[6]Jangid R S.Seismic response of isolated bridges[J].Journal of Bride Engineering,2004,9(2):156-166.
[7]Gavin H,Alhan C,Oka N.Fault tolerance of semiac-tive seismic isolation[J].Journal of Structure Engi-neering,2003,129(7):922-932.
[8]Hwang J S,Sheng L H.Effective stiffness and equiv-alent damping of base-isolated Bridges[J].Journal of Structure Engineering,1993,119(10):3094-3101.
[9]Park Y J,Wen Y K,Ang AH-S.Random vibration of hysteretic systems under Bi-directional ground motions[J].Earthquake Engineering and Structural Dy-namics,1986,14(4):543-557.
[10]Wen Y K.Method of random vibration of hysteretic systems[J].Journal of Engineering Mechanics Divi-sion,1976,102(2):249-263.
[11]JTG/T B02-01—2008公路桥梁抗震设计细则[S].
[12]马涌泉,陈水生.基于自振与频谱特性影响的LRB连续梁桥隔震效果研究[J].武汉理工大学学报,2011,33(7):101-106.
[2]李建中,辛学忠.连续梁桥减震、隔震体系非线性地震反应分析[J].地震工程与工程振动,1998,18(3):67-73.
[3]朱东升,劳远昌,沈大元,等.LRB隔震桥梁的地震反应特点[J].工程力学,2000,18(1):119-125.
[4]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,2008,21(1):65-70.
[5]Ghobarah A,Ali H M.Seismic performance of high-waybridges[J].Engineering Structures,1998,10(3).
[6]Jangid R S.Seismic response of isolated bridges[J].Journal of Bride Engineering,2004,9(2):156-166.
[7]Gavin H,Alhan C,Oka N.Fault tolerance of semiac-tive seismic isolation[J].Journal of Structure Engi-neering,2003,129(7):922-932.
[8]Hwang J S,Sheng L H.Effective stiffness and equiv-alent damping of base-isolated Bridges[J].Journal of Structure Engineering,1993,119(10):3094-3101.
[9]Park Y J,Wen Y K,Ang AH-S.Random vibration of hysteretic systems under Bi-directional ground motions[J].Earthquake Engineering and Structural Dy-namics,1986,14(4):543-557.
[10]Wen Y K.Method of random vibration of hysteretic systems[J].Journal of Engineering Mechanics Divi-sion,1976,102(2):249-263.
[11]JTG/T B02-01—2008公路桥梁抗震设计细则[S].
[12]马涌泉,陈水生.基于自振与频谱特性影响的LRB连续梁桥隔震效果研究[J].武汉理工大学学报,2011,33(7):101-106.
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