桥隧过渡段重载车辆冲击响应分析

Impact response analysis of heavy vehicle passing bridge-tunnel section

考虑车辆的纵向转动与倾覆,将重载车辆通过桥隧过渡段的过程视为一定初始条件下的受迫振动。根据DAlembert原理,建立了车辆与路面的动力耦合计算模型,并给出振动方程,利用Laplace变换,对车辆的动力响应进行分析,求得车辆各轮胎对路面最大作用力随时间的变化规律。研究了车辆载质量、货物位置、行车速度与差异沉降对汽车动力响应的影响,实测了汽车的加速度,并对计算结果进行了验证。分析结果表明:差异沉降、行车速度以及车辆载质量的增加均使车辆对路面的冲击力增大,影响程度由大到小依次为车辆载质量、差异沉降、行车速度;货物位置对车辆冲击力的影响较小。

The rotation and overturn of vehicle in longitudinal direction were considered, and the process of heavy vehicle passing bridge-tunnel section was regarded as forced oscillation under certain initial condition. Based on D＇Alembert principle, the calculating model of vehicle road dynamic coupling was built, and vibration equation was given. The impact response of vehicle was analyzed by using Laplace transform, the change law of maximum impact force of vehicle on road was got. The influences of vehicle load, goods position, vehicle speed, difference settlement on vehicle impact response were researched. The test acceleration value was obtained, and the calculated result of acceleration was verified. Analysis result shows that this impact forces between vehicle and road increase with the increases of difference settlement, vehicle speed and load, the influences from big to small in order are vehicle load, difference settlement, vehicle speed. The goods position has little influence on vehicle impact force. 7 figs, 15 refs.