适用于重载交通的公路桥梁荷载标准研究

Research on Load Standard of Highway Bridges Suitable for Heavy Load Traffic

某一级公路具有明显的重载交通特征,在运营过程中也出现了严重的超载问题,为准确分析该一级公路上的汽车荷载,并确定其对该路上广泛使用的简支梁桥和连续梁桥的荷载作用,以WIM调查数据为基础并进行统计分析,利用蒙特卡洛方法随机数生成模拟自然车队的拟合荷载流。基于《公路工程结构可靠度设计统一标准》中计算荷载效应的可靠度理论,以拟合荷载流在产生的弯矩与公路Ⅰ级的弯矩效应比值为分析对象,确定了适应该一级公路重载交通荷载下计算桥梁结构内力的汽车荷载标准。针对该路重载交通的实际情况,给出了不同超载条件下适度提高汽车荷载等级的荷载放大系数。

The characteristics of heavy traffic is obvious in some first-class highway.At the same time,the overload is very serious.To describe the live load and analyze the action of live load on the simply supported beam and continuous beam bridges in quantitative method,the data from WIM system are dealed with statistics mathematical method.Monte Carlo random number generator theory is used to generate simulation traffic load flow simultaneously.Based on the reliability theory,the bending moment between the normal traffic load value and simulation traffic load flow value are compared.The live load criterion for the heavy traffic of the first-class highway is definited.Last,the live load amplification factors are given to suit different overload conditions.