车辆-桥梁耦合作用分析

文章通过拉氏方程，在时变动力学的基础上，建立车-桥耦合振动的系统方程。重点探讨了车的质量、车速、刚度、阻尼比、桥跨、桥的阻尼比，桥面粗糙程度等参数在车．桥耦合振动中的作用。其中车速、车的刚度、桥的形式、桥的阻尼起着重要作用。文中还比较了把车辆分别模拟为移动力、移动刚体、移动的弹性体时车．桥互相作用力的差别，得出有必要将车辆模拟为移动的弹性体，以减小分析高速车辆所引起的互相作用力的误差。并考虑了车-桥耦合振动中行驶车辆的转动效应，虽然它的影响是很小的；还尝试性的讨论了桥上行车舒适度的问题，车的阻尼起着很重要的作用。

Coupled Interaction Analysis on Vehicle-bridge System

By using Lagrange equations based on time-vary dynamics, the systematic equations on vehicle-bridge coupled vibratoin were formulated. The emphasis on vehicle -bridge coupled vibration analysis is to research on the roles of vehicle mass, vehicle velocity, vehicle stiff, vehicle damp ratio, spans of bridge, damp ratio of bridge, bridge surface irregularities. In the problem, vehicle velocity, vehicle stiff, type of bridge, damp ratio of bridge play the main roles. Also simulating vehicles into moving forces, moving rigid bodies, moving elastic bodies, the differences of vehicle-bridge interactive forces were compared. The conclusion that it is necessary to simulate the vehicles into moving elastic bodies was provided. In order to reduce the error, the interaction between rapid vehicles and bridge was analyzed. The rotation effect of running cars in vehicle-bridge coupled vibration analysis was considered, though its effect is minor. The problem on comfortable degree during running was tried to discuss, in which the vehicle damp ratio is crucial importance.