关于公路桥梁冲击系数的探讨

参照简化的车辆模型和桥梁模型建立车-桥相互作用的数学模型，给出在移动车辆荷栽作用下连续梁桥各截面动力响应的时程曲线和连续梁桥前几阶模态的振型曲线，研究表明，连续粱桥各控制截面起主要作用的模态并不都一样；另外，数值分析表明，对于连续梁桥，冲击系数公式仅考虑桥梁第一阶频率是不合理的。

Discussion on Impacting Factor of Highway Bridge

Base on simple vehicle model and simple continuous girder bridge model, the vehiclebridge interaction model is built. Under moving vehicle loads, the histories of bending moment at different sections and mode curves of continuous girder bridge are given. The investigations show that the main mode is different for different sections of a continuous girder bridge. The numerical analysis indicates that the formula of impacting factor for a concrete continuous girder bridge is unreasonable which only takes account of the first frequency of bridge.