Abstract: Traffic loading is one of the most important parameters in pavement analysis and design.However,currently the Equivalent Axle Load Factors (EALFs) are chosen arbitrarily in calculating the number of equivalent single axle loads (ESALs),and the results could not reflect true traffic conditions.Thus Weight-in-Motion (WIM) data were collected from 2004 to 2006 at 20 expressways in Jiangsu province,and load spectra parameters were determined through the analysis.The difference between AASHTO 1993 and China ESAL calculation methods were analyzed.EALFs of various types of vehicles were determined using both AASHTO1993 and China methods,and results could be used in pavement analysis and design.ESALs for mixed traffic are calculated,and it is pointed out that the difference of EALF calculation methods should be taken into account in comparing the domestic and foreign traffic volumes.

Key words: Equivalent Axle Load Factor (EALF), Weight-in-Motion (WIM), load spectra, AASHTO1993 design method

摘要： 交通荷载是在路面结构分析和设计中最重要的因素之一,然而我国目前在进行沥青路面当量轴载换算时,对不同车型的换算系数取值随意性较大,不能很好的反映真实情况。利用江苏省不同地区20条高速公路从2004年-2006年所有货车和大客车的动态称重(WIM)数据,分析确定了各自的轴载谱参数。比较了我国和AASH-TO1993沥青路面设计方法中的轴载换算公式的区别。分别利用两种方法确定了各种车型的当量轴载换算系数,可供沥青路面结构分析和设计参考。计算了混合交通的当量轴载作用次数,指出在对比我国和国外的交通量时,应考虑由于轴载换算方法不同而带来的差别。

关键词: 当量轴载换算系数, 动态称重, 轴载谱, AASHTO1993设计方法