列车制动下铁路斜拉桥梁轨动力相互作用研究

运用ANSYS软件建立某大跨度铁路斜拉桥梁轨相互作用有限元模型,进行列车制动力作用下的梁轨动力响应分析,研究梁轨相对位移及钢轨制动附加力的动力放大效应以及制动力作用位置、制动距离、斜拉桥结构体系等参数对梁轨动力响应的影响。结果表明:列车制动过程中,钢轨制动附加力峰值产生于斜拉桥梁端;斜拉桥结构在列车制动作用下的动力放大效应并不明显;制动力作用位置、斜拉桥结构体系对梁轨动力响应峰值有较大的影响,而制动距离对动力响应计算结果的影响不大。

Dynamic Interaction between Beam and Track of Railway Cable-Stayed Bridge under Train Braking

The finite element model for the beam-track interaction of a long-span railway cable stayed bridge was established by using ANSYS software.The dynamic response of beam and track under train braking force was analyzed.The dynamic magnification effects of beam-track relative displacement and additional rail braking force were studied,and the influence of such parameters as braking force position,braking distance and the structural system of cable stayed bridge on beam-track dynamic response was analyzed.Results show that,in the process of train braking,the peak value of the additional force of rail braking occurs at the beam-ends of cable-stayed bridge.The dynamic magnification effect of cable-stayed bridge under train braking is not obvious.The braking force position and the structural system of cable-stayed bridge have great influence on the peak value of beam track dynamic response,while the braking distance has little effect on the calculation results of dynamic response.