MEPDG Traffic Loading Defaults Derived From Traffic Pooled Fund Study

Figure 8. Graph. MEPDG alligator cracking prediction.

This graph shows Mechanistic-Empirical Pavement Design Guide (MEPDG) alligator cracking prediction. The x-axis shows the number of truck applications for class 9, and the y axis shows percentage of alligator cracking from 0 to 35 percent. There are four series of lines shown in the figure that correspond to the various loading patterns. The line for SPS site 35-0500 is represented by a continuous purple line and purple square markers for data points and starts with an alligator cracking value of 1.56 percent at 150,000 truck applications and jumps to 1.71 percent at 1,050,000 truck applications, 2.56 percent at 1,500,000 truck applications, 2.89 percent at 1,956,000 truck applications, 4.06 percent at 2,892,000 truck applications, 12.51 percent at 3,360,000 truck applications, 13.97 percent at 3,834,240 truck applications, and 16.08 percent at 4,807,680 truck applications. The line for SPS site 12-0100 is represented by a continuous black line and black diamond markers for data points and starts with an alligator cracking value of 1.58 percent at 150,000 truck applications and jumps to 1.75 percent at 1,050,000 truck applications, 2.99 percent at 1,500,000 truck applications, 3.62 percent at 1,956,000 truck applications, 6.05 percent at 2,892,000 truck applications, 16.54 percent at 3,360,000 truck applications, 17.57 percent at 3,834,240 truck applications, and 18.96 percent at 4,807,680 truck applications. The line for GPS site 50-1004 is represented by a continuous green line and green circular markers for data points and starts with an alligator cracking value of 1.62 percent at 150,000 truck applications and jumps to 1.84 percent at 1,050,000 truck applications, 4.93 percent at 1,500,000 truck applications, 7.02 percent at 1,956,000 truck applications, 12.51 percent at 2,892,000 truck applications, 20.39 percent at 3,360,000 truck applications, 20.81 percent at 3,834,240 truck applications, and 21.38 percent at 4,807,680 truck applications. The line for GPS site 44-7401 is represented by a continuous blue line and blue triangular markers for data points sand tarts with an alligator cracking value of 2.06 percent at 150,000 truck applications and jumps to 3.77 percent at 1,050,000 truck applications, 22.89 percent at 1,500,000 truck applications, 23.59 percent at 1,956,000 truck applications, 25 percent at 2,892,000 truck applications, 28.21 percent at 3,360,000 truck applications, 28.71 percent at 3,834,240 truck applications, and 29.61 percent at 4,807,680 truck applications. A horizontal red line for the terminal condition is at 25 percent all the way across the plot.

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Figure 32. Graph. Monthly NALS for tandem axles for site 26-0100 class 9 trucks.

This line plot shows monthly normalized axle load spectra (NALS) for tandem axles for site 26-0100 class 9 trucks. The x-axis shows the tandem axle load ranges in pounds, and the y-axis shows axle load distribution from 0 to 18 percent. There are 10 series of lines that correspond to the various loading patterns. There are two continuous black vertical lines at 26,000 to 27999 lb and at 34,000 to 35,999 lb that represent the typical peak range of 26,000 to 35,999 lb. There is also another dashed black vertical line at 28,000 to 29,999 lb that represents the peak range of 26,000 to 35,999 lb for the site 26-0100. The line for February 2008 is represented by a dark red line and rectangular markers for data points and has a peak of 10.21 percent at 12,000 to 13,999 lb and a second peak of 4.39 percent at 34,000 to 35,999 lb. The line for April 2009 is represented by a continuous burgundy line and asterisk markers for data points and has a peak of 10.55 percent at 12,000 to 13,999 lb and a second peak of 5.21 percent at 36,000 to 37,999 lb. The line for February 2009 is represented by a continuous green line and green circular markers and has a peak of 110.3 percent at 12,000 to 13,999 lb and a second peak of 5.16 percent at 38,000 to 39,999 lb. The line for January 2009 is represented by a continuous purple line and plus signs for data points and has a peak of 11.85 percent at 10,000 to 11,999 lb and a second peak of 4.54 percent at 36,000 to 37,999 lb. The line for March 2009 is represented by a continuous light blue line and rectangular markers for data points and has a peak of 10.84 percent at 12,000 to 13,999 lb and a second peak of 5.55 percent at 36,000 to 37,999 lb. The line for average for site based on 27 months is represented by a thick continuous black line and has a peak of 13.7 percent at 10,000 to 11,999 lb and a second peak of 7.74 percent at 30,000 to 31,999 lb. The line for average for mu plus 2 times standard deviation is represented by a dashed red line and has a peak of 16.95 percent at 10,000 to 11,999 lb and a second peak of 11.48 percent at 30,000 to 31,999 lb. The line for average for mu minus 2 times standard deviation is represented by a dashed red line and has a peak of 10.44 percent at 10,000 to 11,999 lb and a second peak of 4 percent at 30,000 to 31,999 lb.

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