基于跑车试验的桥梁冲击系数研究

Research on Bridge Impact Coefficient Based on Vehicle Field Test

通过对某钢混组合连续梁桥跑车试验结果进行分析,得到桥梁结构在特定车型及特定车速下可能发生冲击系数异常增大的情况。通过车辆相邻车轴间距,换算在不同车速下前后相邻车轴对桥梁的激励间隔时间,通过对比,当相邻车轴对桥梁的激励间隔时间接近桥自振周期时,桥梁动力效应增大明显,冲击系数显著增大。

Through the analysis of the vehicle field test results of a steel-concrete composite continuous beam bridge,it is found that the impact coefficient of the bridge structure may increase abnormally under specific vehicle type and vehicle speed.According to the distance between adjacent axles of the vehicle,the excitation interval from adjacent ax⁃les to the bridge at different speeds is converted.By comparison,when the excitation interval of adjacent axes of the bridge is close to the natural vibration period of the bridge,the dynamic effect of the bridge increases significantly and the impact coefficient increases significantly.