中文摘要：

在已建立三维车辆模型和所编制车-桥耦合分析程序的基础上,通过接触面间的位移协调条件和力相互作用建立旧桥的车-桥耦合振动方程；根据一座被加固实桥的实测振动数据和模型修正方法对所建立的旧桥的车-桥耦合振动模型进行更新,通过实测数据与数值结果比较表明本文方法可精确地计算出桥梁的动态响应值及冲击系数；并与其他桥梁规范相比表明,美国桥梁规范的冲击系数最大,而中国桥梁规范值最小；相对于大多数路面已经严重损坏的旧桥而言,通过现有规范计算出的桥梁冲击系数已经失去准确性.

英文摘要：

Based on the three-dimensional vehicle model and the calculation code of vehicle-bridge coupled vibration,the vehiclebridge coupled system is established by combining the equations of motion of both the bridge and vehicles meanwhile allowing for the displacement relationship and the interaction force relationship at the contact patches.With the field test vibration data of a reinforced bridge and the modal modification,the bridge and vehicle coupled vibration models were updated.The simulated results show that the present method can simulate precisely the response of the tested bridge; compared with the other bridge codes,the impact factor specified by the bridge code of AASHTO （LRFD） is the most conservative one,and the value of Chinese highway bridge design code （CHBDC） is minimal; for the large majority of old bridges whose road surface conditions have deteriorated,calculating the impact factor with the bridge codes cannot ensure the reliable results.