路桥过渡段容许台阶高度确定的参数影响

Parameters' Influence on Determination of Allowable Differential Settlement between Bridge and Approach Embankment

采用5自由度车辆模型,考虑上桥和下桥两个方向以及车路耦合的影响,给出了车辆通过不设搭板的路桥过渡段进行动力响应分析所需的振动方程、初始条件和前后轮下路面位移,并提出以人的振动频率和最大瞬态振动值作为容许台阶高度确定的控制指标。在动力响应分析的基础上,详细分析了行进方向、车速、车辆载重等参数对容许台阶高度的影响。

In this paper,simplifying the vehicle as a five-degree-freedom system,taking into account of two different movement directions and the compression of the approach roadway,the authors gave the vibration equations and the initial condition and the distance of the pavement under the front and rear wheel which needed in dynamic response analysis of the vehicle passing the end of the bridge without approach slab,and took the frequency and Maximum Transient Vibration Value as the controlling index when the allowable differential settlement were determined.Based on the dynamic response analysis above,the influence on the allowable differential settlement of some parameters,such as movement direction,speed and the weight of the load,were studied,and some conclusions were given,which contributed a lot to the determination of the allowable differential settlement under different conditions.