基于随机过程的连续箱梁桥通行荷载研究

Research on Traffic Load of Continuous Box Girder Bridges Based on Stochastic Process

车辆荷载是桥梁的基本可变荷载之一,其模型由车重、轴重、桥跨、交通量等许多随机变量来表征。选择了7处国省道的移动称重系统(WIM)数据,将其与原交通部"公路桥梁可靠度研究"中相关车辆特征进行对比,分析其差异和变化情况,并将某一时段实测的数据加载在连续箱梁桥上得到对应时程曲线、截口分布和最大值样本分布,并基于此,得到对应典型PC变截面连续箱梁桥的通行荷载特性。

Vehicle load is one of the basic variable loads of bridges and its model is described by many random variables such as vehicle weight,axle load,bridge span and traffic volume.In this paper,the weigh-in-motion (WIM) data of seven national and provincial highways are compared with the related vehicle characteristics in the "highway bridge reliability study" of the original Ministry of Transport and the differences and changes are analyzed.The corresponding time history curve,the section distribution and the maximum sample distribution are obtained by applying WIM data during a certain time period to continuous box girder bridges.Based on this,the traffic load characteristics of typical PC continuous box girder bridges are obtained.