桥头跳车引起的路面受力计算分析

Analysis of Pavement Loading Caused by Vehicle Jumping at Bridge Head

桥头路面沉将导致路、桥过渡段纵坡几何不平顺,由此引起桥头跳车现象。桥头跳车现象将导致路面受力显著的变化。通过建立简化的车辆运动双轴动力模型,得出在桥头跳车过程中车辆的动力振动方程,进而考虑桥头跳车现象中车辆运动的各种边界条件,给出该方程的解析解。结合工程实例计算,对高等级公路跳车过程中后轮对路面作用力进行分析,由此揭示车辆驶向和驶离桥面时车轮对路面作用力的变化情况,可供桥头路基路面沉降分析及相应的设计规范或规定的制定参考。

Settlements of the embankment of bridge approaching cause discontinuity of vertical section in geometric size and cause vehicle jumping at bridge head resulting in vehicle loading onto the pavement in different scale.According to the simplified dynamical model of driving vehicle,a dynamical vibrating equation of vehicle was obtained.Considering the boundary conditions of vehicles passing the bridge head,the analytical solution of dynamical vibrating equation was gained.Combined with a practical engineering,analysis of the dynamical load onto the pavement at bridge head was carried out and the variability of the force caused by vehicle approaching and leaving bridge head revealed,which can be used as references for formulation of design specifications.