考虑行波效应的无砟轨道铁路桥梁纵桥向地震响应

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (4) : 142-149.

论文

刘正楠，陈兴冲，张永亮，丁明波，张熙胤

作者信息 +

Longitudinal seismic response of ballastless railway bridges considering traveling wave effect

LIU Zhengnan，CHEN Xingchong，ZHANG Yongliang，DING Mingbo，ZHANG Xiyin

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文章历史 +

摘要

为研究考虑行波效应的无砟轨道铁路桥梁纵桥向地震响应，选用某高速铁路连续梁及32 m简支梁桥作为研究对象，分别建立考虑轨道约束模型和传统全桥模型，基于绝对位移输入法(ADM)，开展行波效应对两种不同抗震体系(延性及减隔震)铁路桥梁地震响应的影响分析。研究结果表明：对于延性抗震体系，行波对墩底曲率的影响表现为行波对结构反应更有利；对减隔震体系，行波对墩底内力的影响不及延性抗震体系明显。两种抗震体系中，墩梁相对位移的变化应予以考虑，防止邻梁碰撞现象。行波效应对轨道系统的影响应重点关注，避免其轴力过大发生扭曲。不同视波速下，简支与连续梁上的剪力齿槽水平剪力分配呈现此消彼长的现象，简支梁上剪力齿槽抗力应加强设计。行波中的拟静力成分对轨道系统地震响应的贡献显著，动力成分主导桥墩地震响应，两者共同决定总地震响应。

Abstract

In order to study the longitudinal seismic response of ballastless railway bridge considering traveling wave effect, a high-speed railway continuous beam and 32 m simply supported beam bridge were selected as the research object, and the track constraint model and the traditional full bridge model were established respectively.Based on the absolute displacement input method (ADM), the influence of traveling wave effect on the seismic response of two different seismic systems (ductility and isolation) of railway bridges was analyzed.The results showed that for the ductile seismic system, the influence of the traveling wave on the curvature of the pier bottom is more favorable for the structural response, and for the seismic isolation system, the influence of the traveling wave on the internal force at the bottom of the pier is less obvious than that of the ductile seismic system.In the two kinds of seismic systems, the change of the relative displacement of piers and beams should be considered to prevent the collision of adjacent beams.The influence of traveling wave effect on orbital system should be paid more attention to so as to avoid distortion due to excessive axial force.Under different apparent wave velocities, the horizontal shear distribution of shear grooves on simply supported and continuous beams fluctuates, and the resistance of shear grooves on simply supported beams should be strengthened.The quasi-static component in the traveling wave has a significant contribution to the seismic response of the track system, and the dynamic component dominates the pier seismic response, both of which determine the total seismic response.

导出引用

刘正楠，陈兴冲，张永亮，丁明波，张熙胤. 考虑行波效应的无砟轨道铁路桥梁纵桥向地震响应[J]. 振动与冲击, 2020, 39(4): 142-149

LIU Zhengnan，CHEN Xingchong，ZHANG Yongliang，DING Mingbo，ZHANG Xiyin. Longitudinal seismic response of ballastless railway bridges considering traveling wave effect[J]. Journal of Vibration and Shock, 2020, 39(4): 142-149

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