中文摘要：

把桥梁和车辆看作车桥耦合振动体系的两个分离子系统,基于ANSYS软件建立了3种车辆和桥梁的有限元模型。考虑桥面不平度影响,以车轮与桥梁接触点的位移作为协调条件,采用分离迭代算法计算了车桥耦合系统的动力响应。采用快速傅立叶逆变换的方法,应用三角级数叠加模拟了5种等级的桥面不平度及其速度项。通过对一简支梁桥车桥耦合振动的数值模拟,研究了车辆模型、桥面状况和车速对桥梁冲击效应的影响。结果表明：不同车辆模型对桥梁的冲击效应差别很大,桥面不平度对冲击效应的影响较车速大,桥梁的位移冲击效应大于内力冲击效应。因此,设计分析时宜采用能充分模拟车辆特性的复杂模型,移动荷载冲击系数取值建议以位移冲击系数为基准。

英文摘要：

The bridge and vehicle were treated as two separated sub-systems,the FEM model of three vehicle-bridge vibrations were established based on ANSYS software.The dynamic response of vehicle-bridge coupled vibration system was solved by separated iterative algorithm in consideration of the deck roughness and compatibility conditions of the contact points.The fast inverse Fourier transform and trigonometric series iteration were used to generate 5 grades of deck roughness and their derivative velocity terms.The vehicle-bridge coupled vibration of a simple supported beam bridge was simulated numerically to find out the influence of vehicle model,road roughness and the velocity of moving vehicle on the impact effect of bridge.The result indicates that（1）the impact effects of bridge with variant vehicle models differ greatly;（2）the influence of road roughness is more significant than that of the velocity of moving vehicle,and the displacement impact effect is larger than the internal force impact effect.This study illustrates that complicated model that can describe the dynamic characteristic of vehicle should be used and the displacement impact factor is proposed to be used as moving load impact factor in the design and assessment of bridge.