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Running Safety Analysis of Long-Span Railway Cable-Stayed Bridge Under Seismic Excitations

机译：地震作用下大跨度铁路斜拉桥的运行安全分析

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摘要

In order to study the effect of earthquakes on the safety of high-speed railway running over the long-span cable-stayed bridge, based on the dynamic interaction theory of train-railway-bridge, the cable-stayed bridge of the twin towers in Quanzhou bay with the double-span composite beam of ( 70+70+130+400+130+70+70) m is taken as the engineering background. The train-track-bridge coupling vibration analysis model under earthquake action is established. The self-developed train-track-bridge analysis system program TTBSAS is used to simulate the calculation of one measured seismic wave by relative motion method. The influence of the train speed, ground motion peak acceleration and traveling wave effect on train running safety on the cable-stayed bridge of semi-floating system, and get the safe speed threshold when the CRH3 high-speed train passing through the bridge during earthquakes. The results show that the speed, the peak acceleration of ground motion and the traveling wave effect has great influence on the train running safety index on the cable-stayed bridge. The dynamic response of the train-bridge system is larger when the traveling wave speed is 200m/s. The safety threshold of CRH3 high-speed trains under seismic intensity of 7~9 degrees is 300km/h.
机译：为了研究地震对高速铁路跨大跨度斜拉桥安全性的影响，基于列车-铁路-桥梁的动力相互作用理论，对双塔斜拉桥进行了研究。以（70 + 70 + 130 + 400 + 130 + 70 + 70）m双跨组合梁的泉州湾为工程背景。建立了地震作用下的列车－桥梁－桥梁耦合振动分析模型。自行开发的火车—轨道—桥梁分析系统程序TTBSAS，用于通过相对运动方法模拟一个测得的地震波的计算。列车速度，地震动峰值加速度和行波效应对半浮动系统斜拉桥上列车运行安全的影响，并获得CRH3高速列车在地震中通过桥梁时的安全速度阈值。结果表明，速度，地震动的峰值加速度和行波效应对斜拉桥的列车运行安全指数有很大的影响。当行波速度为200m / s时，火车-桥梁系统的动态响应会更大。 CRH3高速列车在7〜9度地震烈度下的安全阈值为300km / h。

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