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建立路桥过渡段三维模型及七自由度整车模型,分析了当搭板板中折断时不同搭板厚度、材料参数以及行车速度对车辆运行平稳性的影响,以车体垂向加速度、车轮动荷载系数以及前后轮垂向位移差作为评价指标,优化了搭板设计参数。结果表明:搭板厚度由25cm增加到50cm的过程中,车辆运行平稳性指标变化非常明显;搭板混凝土标号由C15提高到C25的过程中,车辆的平稳性稍有改善,继续提高至C80的过程中,平稳性几乎没有变化;行车速度小于12.7m/s时,前、后轮动荷载系数都能满足A级路面动荷载系数的标准。认为在道路营运5年内既能满足不劣于人体稍不舒适标准,又能满足前后轮最大动荷载系数为A级路面标准时,搭板的厚度宜取45cm及以上,混凝土标号应在C25及以上,行车速度在12.7m/s以下。
The three-dimensional road-bridge transition model and the seven-degree-of-freedom vehicle model are established. The influence of the thickness, material parameters and driving speed on the vehicle running stability when the slab is snapped is analyzed. The vertical acceleration, Load factor and the vertical displacement difference between the front and rear wheels as evaluation index, optimize the design parameters of the strap. The results show that during the process of increasing the thickness of the slab from 25cm to 50cm, the vehicle running stability index changes obviously. During the process of raising the slab concrete number from C15 to C25, the stability of the vehicle slightly improves and continues to increase to C80 During the process, there is almost no change in the stability; when the running speed is less than 12.7m / s, the dynamic load factors of the front and rear wheels can meet the standard of the dynamic load coefficient of A-class road surface. It is considered that the thickness of the slab should be 45cm and above when the maximum operating dynamic load factor of the front and rear wheels meets the A-level road standard within 5 years of operation of the road, meeting the standard of not less than the slight uncomfortableness of the human body and concrete slab designation C25 and above , Driving speed below 12.7m / s.