高速公路桥梁车辆荷载的三峰分布概率模型

Probability Model of Three-peak Distribution of Vehicle Load on Highway Bridge

为研究高速公路桥梁车辆荷载分布模型,选择G6京藏高速公路,通过统计分析甘肃省内的车辆荷载,得到每日的车辆荷载分布主要由小型车辆、中型车辆和大型车辆组成,呈现出三峰分布的状态,并采用一个极值I型与两个正态分布的加权和拟合得到了三峰分布的概率模型.然后将拟合结果与实际结果、拟合结果之间进行K-S检验,检验结果显示拟合结果可以表明实际的三峰分布,同时每一天的车辆荷载是属于同一分布.这就消除了因为工作日、双休日还有国家法定节假日而导致的车辆荷载分布不同的影响.

In order to research the vehicle load distribution model of highway bridge, the vehicle load on G6 Beijing-Tibet expressway in Gansu Province is statistically analyzed. The result shows that the daily vehicle load consists of small vehicle,medium vehicle and large vehicle,and it pres-ents three-peak distribution. An extreme value I and the weighted sum of two normal distribution are fitted to obtain the probability model of three-peak distribution. Then K-S test is carried out between the fitting results,and the fitting result and the actual result. The result shows that the fitting result can represent the actual distribution of three peaks, and the vehicle load every day belongs to the same distribution. This eliminates different vehicle load distributions in working days, weekends and national holidays.