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本文通过对107国道实际运行线路车辆进行调查,统计分析了车辆的交通量、总重、轴荷分布及轴距等特征。以统计值为依据,选取两轴车进行研究,考虑两轴车以不同车间距组成的车队形式,根据其计算效应与公路设计荷载效应相等的原则,给出了两轴车总重的计算值,并通过比较跨中弯矩效应所得总重值与支座反力效应所得总重值,得出与支座反力效应相等时所得的车总重值为车辆允许通过总重值。同时,通过计算发现,同类型车辆以不同车间距组成的车队通过不同跨径的桥梁时,除个别区段外,车辆允许通过总重值随跨径的增大基本呈下降的趋势;对于同一桥梁跨径而言,该车队组合方式中车辆的允许通过总重值则随着车间距的增大,车辆总重呈逐渐增大的趋势。
Through the investigation of the actual running line vehicles of State Road 107, this paper statistically analyzes the traffic volume, total weight, axle load distribution and wheelbase and other characteristics. Based on the statistical value, the two-axle vehicle was chosen to study, considering the formation of two-axle vehicles with different vehicle distances, the calculated total axle weight of the two-axle vehicle was given according to the principle that its calculation effect was equal to the load effect of highway design By comparing the total weight value obtained from the mid-span bending moment effect with the total weight value of the bearing reaction force, it is concluded that the total vehicle weight value obtained when the bearing reaction force is equal is the total vehicle weight allowed. At the same time, it is found through calculation that when vehicles of the same type and different distances are passing through bridges with different span diameters, the total allowable value of vehicle passing through increases with the span diameter basically declines except for individual sections. For the same As for the bridge span, the total allowable weight of vehicles in the fleet combination mode increases with the increase of the vehicle distance, and the total vehicle weight tends to increase gradually.