多维地震作用下隔震桥梁地震反应(Ⅱ)——理论分析与试验结果比较
|
摘要
为了研究铅芯橡胶支座(LRB)隔震桥梁在双向水平地震激励下的非线性地震反应,首先用Bouc-Wen模型模拟水平正交两向作用力条件下LRB支座非线动力行为的双向恢复力特性。在此基础上,提出一种双向水平地震激励下多跨连续隔震桥梁的非线性地震反应分析模型以及求解方法,并通过隔震连续梁桥结构模型振动台试验证实了所建立双向多自由度计算模型的正确性,以及铅芯橡胶隔震支座两水平方向力变形相互耦合作用模型的合理性。因此,对隔震桥梁LRB支座进行设计时,建议考虑支座恢复力的相互耦合作用;多维地震动输入时,特别是竖向地震分量较大时,进行橡胶支座设计时应考虑铅芯橡胶支座上有竖向拉力产生的情况。
In order to investigate the nonlinear seismic responses of isolated bridges with lead rubber bearings (LRB) under multi-directional horizontal earthquake excitation, Bouc-Wen model of LRB under two horizontal orthogonal directional excitation is adopted. Based on this model of LRB, an analytical model of nonlinear seismic responses of a continuous multi-span isolated bridge with LRB and its solving method are carried out. The multi-degrees-of-freedom mathematical model of the seismically isolated bridge is proved to be right and the bi-directional coupled Park model of LRB is proved to be reasonable by the shaking table tests of the continuous girder isolated bridges model with LRB. It should consider the bi-directional coupled interaction of the restoring forces of LRB, which has considerable effects on the seismic responses of the isolated bridge. Vertical tension of LRB should be considered if vertical earthquake amplitude is greater in isolator design.
In order to investigate the nonlinear seismic responses of isolated bridges with lead rubber bearings (LRB) under multi-directional horizontal earthquake excitation, Bouc-Wen model of LRB under two horizontal orthogonal directional excitation is adopted. Based on this model of LRB, an analytical model of nonlinear seismic responses of a continuous multi-span isolated bridge with LRB and its solving method are carried out. The multi-degrees-of-freedom mathematical model of the seismically isolated bridge is proved to be right and the bi-directional coupled Park model of LRB is proved to be reasonable by the shaking table tests of the continuous girder isolated bridges model with LRB. It should consider the bi-directional coupled interaction of the restoring forces of LRB, which has considerable effects on the seismic responses of the isolated bridge. Vertical tension of LRB should be considered if vertical earthquake amplitude is greater in isolator design.
引文
[1]Ghobarah A,Ali J M.Seismic Performance of HighwayBridges[J].Engineering Structure,1998,10(1):157—166.
[2]Abe M,Fujino,YOSHIDA.Juji.Seismic Performance Eval-uation of Base-isolated Bridges,Control in Natural Disasters(CND 98):A Proceedings Volume from the IFAC work-shop,Tokyo,Japan,1998,117—121.
[3]Pagini L C,Solari G.Stochastic analysis of the linear equiva-lent response of bridge piers with aseismic devices[J].J.Struct.Eng.Struct.Dyn.,1999,28(5):543—560.
[4]Liao W I,Loh C H,Wan S.Response of Isolated BridgesSubjected to Near-fault Ground Motions Recorded in Chi-ChiEarthquake,Proceedings,Proceedings of InternationalWorkshop on Annual Commemoration of Chi-Chi Earthquake,Taipei,Taiwan,Ⅱ,371—380.
[5]Constantinou MC,Kartoum A,Reihorn AM,et al.Sliding I-solation System for Bridges:Experimental Study[J].Earth-quake Spectra,1992,8(3):321—344.
[6]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.
[7]朱东生,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.
[8]王丽,阎贵平,方有亮.隔震桥梁非线性地震反应分析[J].北方交通大学学报,2002,26(1):80—84.
[9]Park Y J,Wen Y K,Ang AHS.Random vibration of hyster-etic systems under bi-directional motions,Earthquake Eng.Struct.Dyn,1986,14(4):543—557.
[10]韩强,杜修力,刘文光.橡胶隔震支座拉伸性能试验研究[J].北京工业大学学报,2006,32(3):208—212.
[2]Abe M,Fujino,YOSHIDA.Juji.Seismic Performance Eval-uation of Base-isolated Bridges,Control in Natural Disasters(CND 98):A Proceedings Volume from the IFAC work-shop,Tokyo,Japan,1998,117—121.
[3]Pagini L C,Solari G.Stochastic analysis of the linear equiva-lent response of bridge piers with aseismic devices[J].J.Struct.Eng.Struct.Dyn.,1999,28(5):543—560.
[4]Liao W I,Loh C H,Wan S.Response of Isolated BridgesSubjected to Near-fault Ground Motions Recorded in Chi-ChiEarthquake,Proceedings,Proceedings of InternationalWorkshop on Annual Commemoration of Chi-Chi Earthquake,Taipei,Taiwan,Ⅱ,371—380.
[5]Constantinou MC,Kartoum A,Reihorn AM,et al.Sliding I-solation System for Bridges:Experimental Study[J].Earth-quake Spectra,1992,8(3):321—344.
[6]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.
[7]朱东生,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.
[8]王丽,阎贵平,方有亮.隔震桥梁非线性地震反应分析[J].北方交通大学学报,2002,26(1):80—84.
[9]Park Y J,Wen Y K,Ang AHS.Random vibration of hyster-etic systems under bi-directional motions,Earthquake Eng.Struct.Dyn,1986,14(4):543—557.
[10]韩强,杜修力,刘文光.橡胶隔震支座拉伸性能试验研究[J].北京工业大学学报,2006,32(3):208—212.
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