风屏障透风率对T型梁桥车桥耦合振动的影响

Effect of wind barrier porosity on coupled vibration of train-bridge system for simply supported T-beam bridge of heavy haul railway in cross wind

为探究强风环境下,风屏障透风率对重载铁路桥车桥耦合振动的影响,依据弹性系统总势能不变值原理,建立风荷载作用下车桥耦合振动方程,计算横风作用下,列车通过安装了不同透风率风屏障的T型梁桥时车桥的气动三分力系数和车桥振动响应。研究结果表明:随着风屏障透风率的增大,列车阻力系数增大,桥梁阻力系数减小;桥梁竖向位移对风屏障透风率的变化不敏感,桥梁横向位移随风屏障透风率的增大而小幅增大;机车的脱轨系数和轮重减载率随着风屏障透风率的增加而增加;风屏障透风率为30%时重车横向摇摆力最小,风屏障透风率为20%时空车横向摇摆力最小。

In order to study the effect of wind barrier porosity on coupled vibration of train-bridge system of heavy haul railway in crosswind,the coupled vibration equation of train-bridge system under wind load was established according to the principle of constant total potential energy of elastic system.The aerodynamic three-component force coefficients and the dynamic responses of train-bridge system were calculated when trains pass through a simply supported T-beam bridge with different pored wind barriers in crosswind.The research results show that with the increase of wind barrier porosity,the drag coefficient of trains increases and the drag coefficient of bridge decreases.The vertical displacement of the bridge is not sensitive to changes in the wind barrier porosity,and the lateral displacement of the bridge increases slightly with the increase of wind barrier porosity.The derailment coefficient and wheel unloading rate of locomotive increase with the increase of wind barrier porosity.When the wind barrier porosity is 30%,the lateral swaying force of full-load trains reaches the minimum.When the wind barrier porosity is 20%,the lateral swaying force of no-load trains reaches the minimum.