汽车制动作用下不同截面形式简支梁桥的冲击系数研究

Study of impact factors of simply-supported concrete girder bridges with different cross-sections under vehicle braking

基于一个三维车-桥振动模型,计算了四座不同截面和跨径的混凝土简支梁桥在一辆典型三轴重车制动作用下的冲击系数。分别研究了刹车位置、减速度、速度、路面粗糙度等几个重要因素对冲击系数的影响规律,对不同截面类型梁桥的冲击系数情况进行了比较,并将计算的冲击系数与我国规范值进行了对比。计算结果可为桥梁评估及工程实践提供一定的参考。

In this study, impact factors of simply supported concrete girder bridges with different cross - sections under the braking of a typical vehicle model were obtained based on a three - dimensional vehicle - bridge coupled model. A parametric study was performed to investigate the effect of several important parameters, including the vehicle braking position, deceleration rate, initial vehicle speed, road surface condition, on the impact factors. Impact factors of simply supported concrete girder bridges with different cross - sections were compared. A comparison was made between the calculated dynamic impact factors and those specified in the current Chinese bridge design code. The results show that vehicle braking has a significant effect on the impact factors. The calculation results in this paper can provide some reference value for bridge evaluation and engineering practice.