公路桥梁车辆荷载概率模型研究(一)——非治超地区

Research on Probabilistic Model of Highway Bridge Vehicle Loads(1)——Non-controlling Area

为了解我国近年公路桥梁车辆荷载的情况,对非治超地区、计重收费地区和强制治超地区的车辆荷载数据进行了统计分析。分析表明,通过所有路段的车辆荷载服从多峰分布。本文用4个正态分布的加权和对非治超地区和计重收费地区车辆荷载的概率分布进行模拟,用6个正态分布的加权和对强制治超地区车辆荷载的概率分布进行模拟。另外,为准确描述对桥梁安全起控制作用的重型车辆荷载,采用分段函数模拟非治超地区车辆的概率分布。车辆荷载在不同时段内的最大值概率分布均可由极值I型描述。

In order to investigate the development of vehicle loads on highway in recent years,data collection and statistical analysis of vehicle loads in overload non-controlling area,toll-by-weight area,and overload controlling area were made.It is shown that all the vehicle loads follow multiple-peaked distribution. The vehicle load probability distribution in overload non-controlling area and toll-by-weight area was simulated using a weighted sum of 4 normal distributions,and the probability distribution of the vehicle load in overload controlling area was simulated by a weighted sum of 6 normal distributions.In order to describe the load limit of heavy duty vehicle for bridge safety accurately,the vehicle load probability distribution in overload non-controlling area was simulated by a piecewise function.The maximum probability distribution of vehicle loads during different periods were simulated by the distribution of I type extremum.