2. Given the pavement structure presented in the blew Table and for a wheel load of 4500 Ib, tire pressure of 100 psi, and traffic speed of 60 mph, determine the followings: • Loading frequency at the mid depth of both asphalt concrete and base layers. Why this is important? • Loading frequency at the bottom of the asphalt concrete layer. Why this is important? • If the coefficients of the resilient modulus model, k and ki, values for the granular aggregates used in the base layer are 7500 and 0.5 respectively, determine the resilient modulus values at the top and middle of the base layer. Discuss the results. If the coefficients of the generalized strain-based fatigue model, ki and k: and ki, values for the hot mix asphalt used in the asphalt concrete layer are 0.008, 3.50, and 0.85 respectively, determine the number of cycles to cause fatigue damage at the bottom of the asphalt concrete layer, N. Layer No. Material Type Thickness (in.) Modulus (psi) Poisson's Ratio Asphalt Concrete 4.0 400,000 0.35 50,000 10,000 2 Base Course 8.0 0.40 3 Silty Clay Subgrade Infinite 0.45
2. Given the pavement structure presented in the blew Table and for a wheel load of 4500 Ib, tire pressure of 100 psi, and traffic speed of 60 mph, determine the followings: • Loading frequency at the mid depth of both asphalt concrete and base layers. Why this is important? • Loading frequency at the bottom of the asphalt concrete layer. Why this is important? • If the coefficients of the resilient modulus model, k and ki, values for the granular aggregates used in the base layer are 7500 and 0.5 respectively, determine the resilient modulus values at the top and middle of the base layer. Discuss the results. If the coefficients of the generalized strain-based fatigue model, ki and k: and ki, values for the hot mix asphalt used in the asphalt concrete layer are 0.008, 3.50, and 0.85 respectively, determine the number of cycles to cause fatigue damage at the bottom of the asphalt concrete layer, N. Layer No. Material Type Thickness (in.) Modulus (psi) Poisson's Ratio Asphalt Concrete 4.0 400,000 0.35 50,000 10,000 2 Base Course 8.0 0.40 3 Silty Clay Subgrade Infinite 0.45
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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pavement
Transcribed Image Text:2. Given the pavement structure presented in the blew Table and for a wheel load of 4500 Ib,
tire pressure of 100 psi, and traffic speed of 60 mph, determine the followings:
• Loading frequency at the mid depth of both asphalt concrete and base layers. Why this is
important?
• Loading frequency at the bottom of the asphalt concrete layer. Why this is important?
• If the coefficients of the resilient modulus model, k and ki, values for the granular
aggregates used in the base layer are 7500 and 0.5 respectively, determine the resilient
modulus values at the top and middle of the base layer. Discuss the results.
If the coefficients of the generalized strain-based fatigue model, ki and k: and ki, values
for the hot mix asphalt used in the asphalt concrete layer are 0.008, 3.50, and 0.85
respectively, determine the number of cycles to cause fatigue damage at the bottom of the
asphalt concrete layer, N.
Layer No.
Material Type
Thickness (in.)
Modulus (psi)
Poisson's Ratio
Asphalt Concrete
4.0
400,000
0.35
50,000
10,000
2
Base Course
8.0
0.40
3
Silty Clay Subgrade
Infinite
0.45
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