行波效应对铁路大跨长联连续刚构桥地震反应的影响
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摘要
介绍了多点激励下结构运动方程的求解方法。以某大跨度铁路连续刚构桥为工程背景,用有限元软件MIDAS建立了结构有限元模型,选取地震波波速为主要参数,对某铁路大跨长联连续刚构桥进行了考虑行波效应的时程反应分析,并与一致激励下的结果进行了对比。结果表明:考虑行波效应后,跨中截面的弯矩增大,而墩底截面的弯矩减小。在梁部结构的抗震设计中应考虑行波效应的影响。
Solution of motion equations of a structure under multi-support excitations is introduced in this paper.Taking a long-span continuous rigid-frame railway bridge as an example,considering earthquake wave speed as main parameter,time history analysis of railway long-span and long-conjunction continuous rigid-frame bridge under traveling wave excitation is performed,and the comparative analysis of the results under the traveling wave and uniform excitation is made.The results show that the moment at the mid span of girder is increasing but the moment at the pier bottom is decreasing with considering traveling wave effect.So traveling wave effect should be considered in the seismic design of girder structure.
Solution of motion equations of a structure under multi-support excitations is introduced in this paper.Taking a long-span continuous rigid-frame railway bridge as an example,considering earthquake wave speed as main parameter,time history analysis of railway long-span and long-conjunction continuous rigid-frame bridge under traveling wave excitation is performed,and the comparative analysis of the results under the traveling wave and uniform excitation is made.The results show that the moment at the mid span of girder is increasing but the moment at the pier bottom is decreasing with considering traveling wave effect.So traveling wave effect should be considered in the seismic design of girder structure.
引文
[1]宋丹,田小红,吴辉科.大跨度刚构桥的行波效应影响分析[J].中南公路工程,2007,32(2):82-85.Song Dan,Tian Xiaohong,Wu Huike.The effect analysis under excitation of traveling waves for long span continuous rigid-framed bridges[J].Central South Highway Engineering,2007,32(2):82-85.
[2]丰硕,项贻强,汪劲丰.大跨径连续刚构桥的动力性能及地震响应分析[J].中南公路工程,2005,30(4):77-81.Feng Shuo,Xiang Yiqiang,Wang Jinfeng.Analysis on dynamic characteristics and seismic responses for long span continuous rigid-framed bridges[J].Central South Highway Engineering,2005,30(4):77-81.
[3]刘洪兵,范立础.大跨桥梁考虑地形及多点激励的地震响应分析[J].同济大学学报:自然科学版,2003,31(6):641-646.Liu Hongbin,Fan Lichu.Seismic analysis of long span bridges considering topographic effects and multi-supported excitations[J].Journal of TongJi University(Natural Science),2003,31(6):641-646.
[4]王蕾,赵成刚,王智峰.考虑地形影响和多点激励的大跨高墩桥地震响应分析[J].土木工程报,2006,39(1):50-59.Wang Lei,Zhao Chenggang,Wang Zhifeng.Seismic responses analysis of continuous rigid-framed bridge with high piers considering topographic effects and multi-support excitations[J].China Civil Engineering Journal,2006,39(1):50-59.
[5]吴东.多点激励下大跨度桥梁的地震反应分析[D].成都:西南交通大学,2006.Wu Dong.Seismic responses analysis for long span bridges under multi-support excitations[D].Cheng Du:Southwest Jiaotong University,2006.
[6]GB50111-2006,铁路工程抗震设计规范[S].GB50111-2006,Code for seismic design of railway engineering[S].
[2]丰硕,项贻强,汪劲丰.大跨径连续刚构桥的动力性能及地震响应分析[J].中南公路工程,2005,30(4):77-81.Feng Shuo,Xiang Yiqiang,Wang Jinfeng.Analysis on dynamic characteristics and seismic responses for long span continuous rigid-framed bridges[J].Central South Highway Engineering,2005,30(4):77-81.
[3]刘洪兵,范立础.大跨桥梁考虑地形及多点激励的地震响应分析[J].同济大学学报:自然科学版,2003,31(6):641-646.Liu Hongbin,Fan Lichu.Seismic analysis of long span bridges considering topographic effects and multi-supported excitations[J].Journal of TongJi University(Natural Science),2003,31(6):641-646.
[4]王蕾,赵成刚,王智峰.考虑地形影响和多点激励的大跨高墩桥地震响应分析[J].土木工程报,2006,39(1):50-59.Wang Lei,Zhao Chenggang,Wang Zhifeng.Seismic responses analysis of continuous rigid-framed bridge with high piers considering topographic effects and multi-support excitations[J].China Civil Engineering Journal,2006,39(1):50-59.
[5]吴东.多点激励下大跨度桥梁的地震反应分析[D].成都:西南交通大学,2006.Wu Dong.Seismic responses analysis for long span bridges under multi-support excitations[D].Cheng Du:Southwest Jiaotong University,2006.
[6]GB50111-2006,铁路工程抗震设计规范[S].GB50111-2006,Code for seismic design of railway engineering[S].
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