为研究列车编组等因素对大跨度铁路斜拉桥冲击系数的影响，针对大跨度铁路斜拉桥车致振动的特点，采用车桥耦合振动的方法，探讨了不同列车运营条件对桥梁局部构件的冲击效应的影响。通过自主研发车桥分析软件BANSYS，分析了大跨度铁路斜拉桥的动力响应，讨论了列车编组、轨道不平顺、行车方向和列车类型等因素对斜拉桥各部件冲击系数的影响。研究表明：进行车桥动力计算和现场动力试验时，应尽量采用与实际列车相同或相似的列车编组；列车行车方向不同时，构件同一位置处冲击系数相差较大。
Abstract
In order to investigate the effect of some factors including train formation on impact coefficient of long-span railway cable-stayed bridge, according to the vehicle-induced vibration characteristics of long-span railway cable-stayed bridge, the method of vehicle-bridge coupling vibration is adopt to explore the impact effects to local elements of bridge under different train’s operational conditions. Based on the self-developed software BANSYS, the dynamic responses of the long-span railway cable-stayed bridge are calculated, and the effect of train formation, track irregularities, advancing directions and types of trains on the impact characteristics of each part of cable-stayed bridge are discussed. The results show that the same or similar train formation should be adopted when conducting vehicle-bridge dynamic calculation or field dynamic experiments; there are obvious differences among the impact coefficients at the same position when the driving direction of train is opposite.
关键词
大跨度铁路斜拉桥 /
车桥耦合振动 /
冲击系数 /
影响因素 /
列车编组
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Key words
long-span railway cable-stayed bridge /
vehicle-bridge coupling vibration /
impact coefficient /
influencing factor /
train formation
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