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当路桥过渡段不设桥头搭板时,在引道和桥台之间由于工后沉降差所造成的台阶是桥头跳车的主要诱因,不同的台阶高度会对行车安全造成不同的影响。但目前对于容许台阶高度尚未形成一致的认识。文中通过对未设搭板情况下桥头跳车形成机理的分析,建立路桥过渡段台阶高度与减速度之间的关系,进而以减速度为依据分析台阶高度对交通安全的影响,分别确定了行车速度为80km/h、100km/h、120km/h时3种情况下,不同影响等级所对应的容许台阶高度。研究表明:从交通流运行特征的角度分析台阶高度与交通安全的关系是可行的,未设搭板情况下容许台阶高度与车速紧密相关,其取值随着行车速度的增加不断减小。
When the transitional section of road and bridge is not provided with bridgehead, the difference caused by post-construction settlement difference between approach road and bridge abutment is the main cause of bridgehead jumping. Different step height will have different impact on driving safety. However, no consensus has been reached yet on the allowable height of the steps. Through the analysis of the forming mechanism of bridgehead jumping without bows, this paper establishes the relationship between the bridge height and the deceleration of road-bridge transitional section, and then analyzes the influence of the height of stairs on the traffic safety based on the deceleration, Speed of 80km / h, 100km / h, 120km / h when the three cases, the impact of different levels corresponding to the allowable step height. The research shows that it is feasible to analyze the relationship between the height of steps and traffic safety from the perspective of traffic flow characteristics. The height of stairs is closely related to the speed of the vehicle without the baffle, and its value decreases with the increase of traffic speed.