高速公路桥梁活荷载参数研究

在高速公路桥梁结构极限承载力和可靠性研究中,由于规范中没有车辆荷载的统计参数,无法直接进行可靠性分析,因此有必要首先进行荷载统计参数和加载模型的研究.基于英国交通研究实验室于1990年进行的历时2周的统计调查所得的WIM数据,利用Microsoft Visual Basic(6.0版)编制分析程序,首先根据各种不同车辆出现概率统计出5种最常见载重卡车;然后分别统计其构形、轴重、总重及桥跨为变量时多辆卡车在桥梁上同时出现的概率.统计结果可直接用于桥梁结构体系可靠性分析.

Study on Live Load Parameter for Highway Bridge

We have been unable to make a reliability analysis about the highway-bridge structure because the previous study lacks related statistical parameters about vehicle load in bridge specifications. Therefore, a study of the loading model must be enforced for developing an appropriate loading model for the system reliability analysis. The research in this paper based on the analysis of the WIM data from British Transportation Research Lab (tested lasting two weeks in 1990) and the analysis program by Microsoft Visual Basic (6.0). Two main aspects are involved in it. The first one is to find out which trucks are the most frequent according to the probability they turn up. The second one is to count up these trucks' configurations, axle weigh, gross weigh respectively and the occurrence probability of more than one truck going side by side or in lane as the bridge span is variable. The statistical data concluded from this paper may be used to study reliability assessment of bridges once the resisting-force-load model of bridge has been established.