城市桥梁汽车荷载调查与疲劳荷载模型研究

Research on Vehicular Loads and Fatigue Load Model of Urban Road Bridge

以成都市城市快速路三环路的汽车荷载为研究对象,在道路的东、南、西、北4个方向各全天候不间断地连续测试7 d,采集车辆信息共计122万余辆,信息包括交通流量、轴重、轴距、总重、车速和车牌等。最后以成都市三环路北段的测试数据为基础,根据299 439条汽车荷载信息,统计出成都市三环路的汽车荷载频值谱。依据基于损伤应变的疲劳等效原则和英国BS5400规范的计算方法,以实测的车辆荷载频值谱为基础,制定出符合成都市三环路的汽车疲劳荷载模型。对于其他交通组成相同的道路,该汽车荷载模型可为道路桥梁的疲劳损伤验算提供有价值的参考。

Taking the vehicular loads on The Third Ring Expressway in Chengdu as the research object, all the vehicles from the east, south, west and north directions are tested for continuous 7 d. The data of 1 220 thousand vehicles are collected, which includes traffic volume, axle weight, wheelbase, total weight, speed, license plates, and so on. Finally, based on the test data of the north section, a total of 299, 439 pieces of vehicular load information, the vehicle load frequency value spectrum of the third ring road is obtained. According to the damage stress based fatigue equivalent principle and the calculation method specified in British BS5400 standard, on the basis of the measured vehicular load frequency value spectrum, the model of vehicular fatigue load on The Third Ring Expressway is worked out. The vehicular load model can provide a valuable reference for checking fatigue damage of road bridges which has the same traffic composition.