Question: 2 (20 Points): For the pavement structure shown in the figure below, the radial strain under the center line o

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Question 2 20 Points For The Pavement Structure Shown In The Figure Below The Radial Strain Under The Center Line O 1 (133.43 KiB) Viewed 49 times

Question: 2 (20 Points): For the pavement structure shown in the figure below, the radial strain under the center line of the wheel load are plotted versus depth within the pavement structure as shown in the next figure. The air voids of the HMA layer is 7% and the binder content by volume is 10%. Note: use -ve for compression and +ve for tension. All responses are under the centerline of the wheel load. Note also that the fatigue model requires all inputs to be in the US Customary unites. 1 psi = 6.895 kPa, 1 inch = 2.54 cm, and 1 uε = 10-in./in. Assume Poisson's ratio is equal to 0.5 for all layers, determine the following: a) Determine the number of loading cycles to fatigue failure for this pavement structure using the MEPDG fatigue cracking model shown below: (10 points) 3.9492 1.281 N, = 0.00432 x k'ı xCx ♡ Where, E is the stiffness of the HMA layer in psi and &t is the strain at the bottom of the HMA layer in in/in. b) If the actual number of loading cycles from the same axle category= 100,000 repetitions, determine the fatigue damage and bottom-up fatigue cracking %: (10 points) ఆలో - 1.0 -2x C2 1.0 C'} = -2.40874 – 39.748x(1+h)-2.856 HMA, E1 = 1,500 MPa 15 cm Base, Ez = 350 MPa = 50 cm Subgrade, Ez = 65 MPa
Radial Strain (us) -200 0 200 400 -600 -400 600 800 1000 -1000 -800 0 20 40 Depth (cm) 60 80 Radial Strain 100