地震作用下千米级高速铁路悬索桥行车安全性研究

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (10) : 249-255.

论文

雷虎军1,2，刘伟1，黄炳坤1

作者信息 +

Running safety of high-speed railway kilometre-level suspension bridge under earthquake

LEI Hujun1,2, LIU Wei1, HUANG Bingkun1

Author information +

文章历史 +

摘要

为研究地震作用下超大跨铁路悬索桥桥上列车的行车安全问题，以某主跨为1 120 m的公铁两用悬索桥方案为研究对象，采用虚拟横梁法建立了全桥梁格模型，并通过板梁组合模型验证了梁格模型的正确性。在此基础上，通过输入7条地震波，采用自主编制的列车-轨道-桥梁-地震分析程序TTBSAS进行仿真计算，研究了一致激励、行波激励下悬索桥-列车系统的动力响应特征，分析了列车过桥时的行车安全性。结果表明：对于悬索桥-列车系统，地震对桥梁和轨道动力响应的影响大于车辆；横向地震除了使钢桁梁主梁及桥上轨道发生大幅横向振动外，还会诱发主梁的附加扭转振动；不考虑地震行波效应会严重低估列车的行车安全性指标。对于这些计算条件，桥上列车行车安全性研究的最不利行波波速为500 m/s，在0.15 g 设计地震作用下列车通过主跨1 120 m悬索桥时的安全车速阈值为300 km/h

Abstract

In order to study the running safety of trains on a super-long-span railway suspension bridge under earthquake, taking the scheme of a highway-railway suspension bridge with a main span of 1 120 m as the research object, the full bridge lattice model was established by using the virtual crossbeam method, and the correctness of the grillage model was verified by the plate-beam combination model.On this basis, by inputting seven seismic waves, the train-track-bridge-seismic analysis program TTBSAS was used for simulation calculation, the dynamic response characteristics of suspension bridge-train system under uniform excitation and traveling wave excitation were studied, and the running safety of the train crossing the bridge was analyzed.The results show that for the suspension bridge-train system, the influence of the earthquake on the dynamic response of the bridge and track is greater than that of the vehicle, and the lateral earthquake not only causes the large lateral vibration of the steel truss girder and the track on the bridge, but also induces the additional torsional vibration of the main girder.Without considering the seismic traveling wave effect, the safety index of the train will be seriously underestimated.According to the calculation conditions of this paper, the most unfavorable traveling wave speed for the study of train safety on the bridge is 500 m, and the safe speed threshold of the train passing through the main span 1 120 m suspension bridge under the action of 0.15 g design earthquake is 300 km/h.

导出引用

雷虎军1,2，刘伟1，黄炳坤1. 地震作用下千米级高速铁路悬索桥行车安全性研究[J]. 振动与冲击, 2020, 39(10): 249-255

LEI Hujun1,2, LIU Wei1, HUANG Bingkun1. Running safety of high-speed railway kilometre-level suspension bridge under earthquake[J]. Journal of Vibration and Shock, 2020, 39(10): 249-255

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