Research on Longitudinal Seismic Responses of Continuous Welded Rails on Large-span Bridges
Research on Longitudinal Seismic Responses of Continuous Welded Rails on Large-span Bridges
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发表时间：
2014
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通讯作者：
Y. Men
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作者：
Y. Men
大跨桥梁连续焊轨纵向地震反应研究具有重要意义。以某大跨桥梁为例，研究了均匀激励下连续焊轨的纵向地震反应，研究了小阻力扣件的敷设、梁温差和地震波谱特性对连续焊轨最大纵向力的影响。 结果表明:钢轨约束对大跨桥梁结构的低阶纵向固有频率影响较大;地震作用下梁缝处钢轨最大受力远大于现行规范计算的最大膨胀力,因此建议铁路相关工程规范中增加钢轨地震力指标;大跨度设置小抗力扣件的情况 桥梁最大钢轨受力将降低20%~30%；跨地震区的大跨度桥梁连续梁设计应合理考虑梁温差，桥梁结构低阶纵向固有频率设计应避开现场地震波的主要频段，否则地震时连续梁的工作状态将受到严峻考验。
Study on longitudinal seismic responses of CWRsCcontinuous welded rails) on large-span bridges is of great significance.Taking one large-span bridge as an example,longitudinal seismic responses of CWRs under uniform excitation were studied.Influence of laying of small resistance fasteners,beam temperature differences and seismic wave spectrum characteristics on the maximum CWRs longitudinal force was analysed.Results show as follows;Rail restraints have great influence on the low-order longitudinal natural frequencies of the large-span bridge structure;the maximum rail forces at beam joints under the action of earthquake motion are much larger than the maximum expansion forces calculated according to the current specifications,so the index of rail seismic force is suggested to be added to the related railway engineering specifications;in the case that small resistance fasteners are installed on large-span bridges,the maximum rail force will be decreased by 20%~30%in earthquake;CWRs design for large-span bridges located across earthquake zones should take beam temperature differences into rational consideration,and the low-order longitudinal natural frequencies of the bridge structures should be designed to avoid the main frequency bands of seismic waves on site,otherwise the working status of CWRs will be subjected to severe tests when in case of earthquake.