车辆荷载作用下大跨桥梁的随机振动

Random Vibration of Long Span Bridge under Moving Vehicles

基于随机轨道粗糙度和车桥偶合单元,提出了大跨桥梁移动车辆荷载作用下随机振动的计算模式。采用功率谱密度函数生成随机的轨道粗糙度,车辆模拟为4轴模型,桥梁模拟为梁单元,考虑桥梁的几何非线性,对一座实际大跨斜拉桥的冲击效应进行了研究,并分析了随机样本数目、阻尼及车辆速度的影响。

Based on random rail roughness and vehicle-bridge coupling element, a method is proposed for calculating random vibration of long span bridges under moving vehicles in this paper. In the method, the random rail roughness samples are generated using a power spectral density function, the vehicle is modeled as a four axle system, the bridge is modeled as beam elements, and geometric nonlinearity of the bridge is taken into account. Impact effects of a cable stayed bridge are investigated with various numbers of roughness samples, values of damping and speeds of train.