轨道约束系统对高速铁路多跨简支梁桥地震反应的影响
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摘要
文中结合高速铁路多跨简支梁桥及轨道系统的特点,建立了考虑钢轨、轨道板以及桥梁结构的线桥一体化模型,采用反应谱法研究了轨道约束系统以及相邻后继结构对所选桥跨地震反应的影响。研究结果表明:轨道约束系统对相邻墩高相差较大的多跨简支梁桥的地震反应影响较大,因此对其地震反应分析时应采用线桥一体化模型;由于受端刺等路桥过渡段结构纵向刚度的影响,后继结构的桥梁跨数越少,对边墩地震反应的卸载作用越显著。
Based on properties of multi-span simply supported girder bridges and rail system restraints in the high-speed railway,a rail-bridge model is established by considering rail,track slab and bridge structure.Elastic response spectra are adopted to research the influnce of rail system restraints and the succeeding-structure on seismic response for selected bridge spans.The results show that the effect of rail system restraints on seismic response for the multi-span simply supported girder bridge with relatively great difference height of adjacent piers is significant,so the rail-bridge model for the case should be adopted in earthquake response analysis.Due to the effect of longitudinal stiffness of the railway and bridge transitional section such as terminal spine,the unloading effect on the seismic response of the side piers is more significant if the number of the succeeding-structure spans is fewer.
Based on properties of multi-span simply supported girder bridges and rail system restraints in the high-speed railway,a rail-bridge model is established by considering rail,track slab and bridge structure.Elastic response spectra are adopted to research the influnce of rail system restraints and the succeeding-structure on seismic response for selected bridge spans.The results show that the effect of rail system restraints on seismic response for the multi-span simply supported girder bridge with relatively great difference height of adjacent piers is significant,so the rail-bridge model for the case should be adopted in earthquake response analysis.Due to the effect of longitudinal stiffness of the railway and bridge transitional section such as terminal spine,the unloading effect on the seismic response of the side piers is more significant if the number of the succeeding-structure spans is fewer.
引文
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[5]Ⅱ型板对桥梁地震反应的影响[R].兰州交通大学,2010.The influence ofⅡtype slab on seismic response of the bridge[R].Lanzhou Jiaotong University,2010.
[6]GB50111-2006铁路工程抗震设计规范[S].GB50111-2006,Code for Seismic Design of Railweug Engineering[S].
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[2]罗学海,朱葳,谢逢萱.铁路实体桥墩动力分析的简化方法[J].地震工程与工程振动,1982,2(3):87-95.Luo Xuehai,Zhu Wei,Xie Fengxuan.Asimplified method for dynamic analysis of piers of railway bridges[J].Journal of Earthquake Engineeringand Engineering Vibration,1982,2(3):87-95.
[3]黄艳,阎贵平,刘林.轨道约束对铁路桥梁纵向地震反应特性的影响[J].铁道学报,2002,24(5):124-128.Huang Yan,Yan Guiping,Liu Lin.Effects of rail restraints on longitudinal seismic response of railway bridges[J].Journal of The China RailwaySociety,2002,24(5):124-128.
[4]马坤全,陈文艳.轨道交通高架桥合理抗震设计参数及抗震措施研究[J].中国铁道科学,2001,22(4):63-68.MAKunquan,Chen Wenyan.The Research of the reasonable seismic design parameters and anti-seismic measures of mass transit viaducts[J].Chi-na Railway Science,2001,22(4):63-68.
[5]Ⅱ型板对桥梁地震反应的影响[R].兰州交通大学,2010.The influence ofⅡtype slab on seismic response of the bridge[R].Lanzhou Jiaotong University,2010.
[6]GB50111-2006铁路工程抗震设计规范[S].GB50111-2006,Code for Seismic Design of Railweug Engineering[S].
[7]郑健.中国高速铁路桥梁[M].北京:高等教育出版社,2008.Zheng Jian.The Bridge of High-speed Railway in China[M].Beijing:Higher Education Press,2008.
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