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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DAlembert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。
Taking into account the longitudinal rotation and overturning of the vehicle, the process of passing heavy vehicles through the transitional section of the bridge and tunnel is regarded as forced vibration under a certain initial condition. According to the principle of D Alembert, the dynamic coupling calculation model between vehicle and pavement is established, and the vibration equation is given. By using Laplace transform, the dynamic response of the vehicle is analyzed, and the variation law of maximum force of each tire on the road surface with time is obtained . The influence of vehicle mass, cargo position, driving speed and differential settlement on the vehicle dynamic response is studied. The acceleration of the vehicle is measured and the calculation results are verified. The results show that the impact of the vehicle on the road surface increases with the differential settlement, the driving speed and the vehicle mass loading, and the impact degree from big to small is the vehicle mass, differential settlement and driving speed. The impact of the cargo position on the vehicle impact force Less affected.