A method for flexible pavement thickness design which requires the calculation of summation of equivalent 18,000-lb axle loads over a design period has been proposed for use in Minnesota. In order to calculate equivalent loads it is necessary to know equivalency factors for various axle loads and configurations, total traffic, vehicle type distribution and axle load distribution within each vehicle type. For convenience the load distribution for each vehicle type is laid out in the format of a standard W-4 Table and the average effect is determined and called an N18 Factor for each vehicle type. Axle load equivalencies from the AASHO Road Test which are dependent on thickness index and terminal serviceability index are used. A study of the effect of each of these factors with time and location on design thickness indicates that for design purposes it would be desirable to allow them to study. Based on a traffic load and vehicle type distribution study on 40 Minnesota test sections it was found that design thicknesses can vary by 2 to 3 in. of granular equivalent for variations in vehicle type distribution and up to 10 in. for typical variations in vehicle weight distribution. (Author)
Use of Traffic Data for Calculating Equivalent 18000 lb Single Axle Loads
1970
66 pages
Report
No indication
English
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