高速铁路斜拉桥与T型刚构协作体系车桥耦合振动分析

Coupling Vehicle-Bridge Vibration Analysis of Collaborated System with Cable-Stayed Bridge and T-shape Rigid Structure on High Speed Railway

建立了列车、斜拉桥与T型刚构协作体系空间振动的有限单元分析模型,按照轮轨密贴接触假定建立了车-桥系统耦合运动方程组,以德国低干扰谱生成轨道不平顺样本作为激励源,对一座(100+2×210+100)m的斜拉桥与T型刚构协作体系的自振特性以及4种列车车型分别以不同车速通过该桥梁的空间振动响应进行了计算分析,结果表明:在计算桥梁的自振频率时,第一、第二自振频率均为主梁横向弯曲;斜拉桥与T型刚构协作体系可以提高全桥的竖向刚度;德国ICE3车型通过桥梁时,车桥系统振动响应最大,竖向挠跨比约为1/5 440,桥上车辆的各项指标均在我国规范规定的允许值以内;车辆乘客乘坐横、竖向平稳性指标均达到"良好"标准以上,表明该斜拉桥与T型刚构协作体系能较好地满足高速行车要求.

A finite element analysis model for space vibration of the train and the collaborated system with cable-stayed bridge and T-shape rigid structure was established. The coupled equations of motion were presented for the vehicle-bridge system on the basis of a corresponding assumption on the wheel-track interaction both in lateral and vertical directions. Taking the track irregularity samples based on German low disturb track spectra as excitation, the space vibration responses were analyzed when the train ran through the collaborated system with cable-stayed bridge and T-shape rigid structure at different speeds. Numerical results show that the mod- els of the first two orders of the collaborated system with cable-stayed bridge and T-shape rigid structure are bending in lateral. It follows that the lateral rigidity is smaller than the vertical rigidity. The collaborated system with cable-stayed bridge and T-shape rigid structure has bigger vertical stiffness while calculating the natural frequency. The ratio of dynamic deflection to bridge span is 1/5440： as the German ICE3 train runs through the b bridge are wi thus can well ridge, th th in the e space vibration responses are the highest. All the dynamic indices of the vehicle on the range of the allowable values. The ride comfort indices all achieve the good standard, satisfy the high speed train passage.