Abstract: The vehicle-bridge system are considered as two separate subsystems，and the vibration equilibrium functions for double axis vehicle model and bridge are derived with the application of d’Alembert principle． And then the separate iteration method is applied in the numerical solution of vehicle-bridge coupling vibration problem． In consideration of NEWMAＲK numerical calculation principals，computational procedures for vehicle-bridge coupling vibration are compiled by use of MATLAB． Furthermore，the accuracy of this program is verified． The influence of the deck conditions and vehicle speed on vehicle-bridge system is discussed on the basis of this program． It demonstrates that the solution is accurate and the influence of the deck conditions on vehicle-bridge vibration is significant; the influence of the vehicle speed on bridge vibration depends on the force frequency caused by vehicle on the bridge．

Key words: vehicle-bridge system, numerical analysis, vehicle model, dynamic response

摘要： 将车桥系统视为两个分离的子系统，应用达朗贝尔原理推导了双轴密贴车辆模型和桥梁的运动平衡方程，采用分离迭代法对车桥振动问题进行数值求解。利用 MATLAB 结合 NWMAＲK 法计算原理编制了车桥耦合计算程序，对该程序的准确性进行了验证，在此基础上研究了桥面状况和车速对车桥振动的影响。结果表明: 该程序的计算结果准确可靠，桥面状况对车桥振动影响很大，车速对桥梁振动的影响取决于与其对应的车辆对桥梁作用力的频率。

关键词: 车桥系统, 数值分析, 车辆模型, 动力响应