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

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.