人车路系统分析模型在差异沉降指标确定中的应用

在对设置桥头搭板的路桥过渡段路面进行简化后,建立了车辆通过搭板时的人车路垂向振动系统分析模型;通过模态分析方法求解并计算了车辆下桥时的人车系统的位移响应,速度响应和加速度响应;利用所建的人车路系统分析模型对车辆经过路桥段时的振动特性进行了评价;并结合公路线形特点确定了路桥过渡段差异沉降指标与搭板坡差、桥面坡差、车速、载重、搭板长度等因素之间的关系,最终从功能性的角度提出路桥过渡段的搭板容许坡差应不超过0.4%.

Application on People - Vehicle - Road Analysis Model on Differential Settlements of Bridge - Approach

The people-vehicle-road analysis model has been established through the simplification of bridge-approach with the slab when the vehicle passes the transition section.Secondly,the mode analysis method is employed to calculate the displacement,velocity and acceleration of people and vehicle when the vehicle is coming down from the bridge.Thirdly,the vibration characteristics of vehicle are evaluated according to the analysis model.Lastly,the relationships between differential settlements and different factors,such as slab slope,bridge slope,velocity,vehicle load and slab length,are studied to decide the permissible allowable slab slope within 0.4% from the angle of functional index.