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In this article,the earthquake response features of cable-stayed railway bridge are investigated through inputing different earthquake excitings to typical bridge and varying the vehicle and structural parameters.The study results show that the main factors affecting the seismic response characteristics of bridge are the dynamic properties of vehicles and bridge,as well as the input excitings.By the comparison analysis of various conditions,the effect mechanism of train velocity,lateral stiffness of bridge span,stiffness... In this article,the earthquake response features of cable-stayed railway bridge are investigated through inputing different earthquake excitings to typical bridge and varying the vehicle and structural parameters.The study results show that the main factors affecting the seismic response characteristics of bridge are the dynamic properties of vehicles and bridge,as well as the input excitings.By the comparison analysis of various conditions,the effect mechanism of train velocity,lateral stiffness of bridge span,stiffness of sub-structure,and the input excitings is discussed and summarized. 通过对典型铁路斜拉桥在地震作用下的响应分析,研究了斜拉桥这种适用跨度大、空间受力性能优越的桥型的抗震性能。结果表明,影响斜拉桥在地震作用下的响应特性及桥上运行列车稳定性和安全性的因素主要是桥、车的动力特性及输入地震激励的物理特性。通过对不同结构参数、列车速度和地震作用条件下桥车响应的对比分析,得出了行车速度、桥梁横向刚度(宽跨比)、桥梁下部结构刚度以及不同输入地震激励对桥梁地震响应的影响规律与特点。 In this paper,the calculation model of the girder-pier system is proposed.Lateral seismic response of Long-span bridges with high piers is analysed numerically.Influ-ence of the asynchronous lateral ground motion on the bridge response is studied.Further-more,the role of the lateral stiffness in seismic response is discussed.Results of our study in-dicate that the asynchronous lateral ground motion has a negative effect on the earthquake-re-sponse of the long-span bridge with high piers. However,the lateral... In this paper,the calculation model of the girder-pier system is proposed.Lateral seismic response of Long-span bridges with high piers is analysed numerically.Influ-ence of the asynchronous lateral ground motion on the bridge response is studied.Further-more,the role of the lateral stiffness in seismic response is discussed.Results of our study in-dicate that the asynchronous lateral ground motion has a negative effect on the earthquake-re-sponse of the long-span bridge with high piers. However,the lateral stiffness of box-girderhas little effect on the lateral seismic response of the bridge. 本文建立了梁、墩空间耦联体系力学模型,计算分析了大跨度高墩连续梁桥的横向地震反应;探讨了该桥在地震作用下的相位差效应,以及桥梁横向刚度对其地震响应的形响。研究结果表明,地震波的相位差效应对于大跨度高墩桥是不利的;梁的横向刚度对该桥的横向地震反应影响不大。 Contents of lateral stiffness of railway bridge are analysed, expressions of comfortable range, with horizontal f/L ratio as evaluation scale of lateral stiffness, for a train passing through a bridge are proposed, and furthermore, theoretic methods, considering accerleration probabilty distribution, for determining allowable f/L ratio are established and verified with calculation examples. 分析了铁路桥梁横向刚度的内蕴,提出了适用于列车过桥的舒适度表达式,建议以水平挠跨比作为横向刚度的评价尺度。在此基础上,考虑加速度的概率分布,得出了确定允许挠跨比的理论方法,并通过算例予以验证
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