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Variable Serviceability Concept For Pavement Design Confirmed By Aasho Road Test Fatigue Data, Herbert F. Southgate, Robert C. Deen
Variable Serviceability Concept For Pavement Design Confirmed By Aasho Road Test Fatigue Data, Herbert F. Southgate, Robert C. Deen
Kentucky Transportation Center Research Report
Fatigue data from the AASHO Road Test were plotted for each level of serviceability. The Kentucky thickness design system uses the concept of a variable level of serviceability as a function of EALs. The Kentucky thickness design curve for the equivalent CBR was converted to an equivalent structural number and superimposed on each of the specific serviceability figures. The AASHTO Equation C–14 of the 1972 AASHTO Interim Guide was evaluated for each level of serviceability and superimposed on its respective figure. Equation C–14 fits reasonably well for serviceability levels of 2.0 and 2.5 but does not fit the remining serviceability …
Variations Of Fatigue Due To Unevenly Loaded Axles Within Tridem Groups, Herbert F. Southgate, Robert C. Deen
Variations Of Fatigue Due To Unevenly Loaded Axles Within Tridem Groups, Herbert F. Southgate, Robert C. Deen
Kentucky Transportation Center Research Report
The effect of unevenly distributed loads on the axles within a tridem has been shown to be very significant. Equations are presented that enable the equivalent load effect for equal load distribution to be adjusted for uneven loading. Considering the relative increase and the relatively small volume of trucks currently using tridems, the equation for all tridems without regard to locations on the vehicle is recommended at this time. Consideration should be given to using equations for individual load patterns as the volume of trucks using tridems increases and more weight data become available.