pavement , 1. Determine the CBR value of a local dune sand to be used as a subgrade layer using the testresults summarized in the below Table. Apply any necessary corrections.Penetrati 0.0 0.0 0.0 0.0 0.0 0.1 0.1on (in.) 0 2 | 4 |6 8 0.1i 2Load at4 0.16 0.18 0.2 0.22 0.24 o.26 0.28 0.3103. 107. 112. 116. 120. 122. 124.20. 34. 50. 63. 77. 87.Top (Ub)Load at0.0 8.5 5 8183 7 95.8 24710. 25. 40. 56. 71. 83. 93. 100. 108. 114. 119. 122. 124. 125. 126.0.0 3Bottom254 545432. Given the pavement structure presented in the blew Table and for a wheel load of 4500 1b.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 isimportant?• Loading frequency at the bottom of the asphalt concrete layer. Why this is important?• If the coefficients of the resilient modulus model, k; and k, values for the granularaggregates used in the base layer are 7500 and 0.5 respectively, determine the resilientmodulus values at the top and middle of the base layer. Discuss the results.• If the coefficients of the generalized strain-based fatigue model, k, and k and k, valuesfor the hot mix asphalt used in the asphalt concrete layer are 0.008, 3.50, and 0.85respectively, determine the number of cycles to cause fatigue damage at the bottom of theasphalt concrete layer, N.Material TypeAsphalt ConcreteLayer No.Thickness (in.)Modulus (psi)Poisson's Ratio14.0400,0000.352Base Course8.050,0000.40Silty Clay Subgrade3Infinite10,0000.453. The table below includes the coefficients of both the dynamic modulus (E*) sigmoidalfunction and the shift factor-temperature function. Determine the [E*| at the mid of theasphalt concrete layer of the pavement structure given in Question 2 for the following twoconditions:a. The pavement temperature at the mid of asphalt layer is 50 °F and the traffic speed is 70mph.b. The pavement temperature at the mid of asphalt layer is 100 °F and the traffic speed is 30mph.c. Discuss the resultsa4.8101.7310.5570.6280.00015-0.1016.316

CBR is the abbreviation of California bearing ratio. It is the mechanical property property of the…

1. Determine the CBR value of a local dune sand to be used as a subgrade layer using the test results summarized in the below Table. Apply any necessary corrections. Penetrati 0.0 0.0 0.0 0.0 0.0 on (in.) Load at Top (Ub) Load at 0.1 0.1 02 46 8 0.1 2 4 0.16 0.18 0.2 0.22 0.24 0.26 0.28 0.3 20. 34. 50. 63. 77. 87. 103. 107. 112. 116. 120. 122. 124. 0.0 8.5 5 8 1 8 3 7 95.8 2 0 4| 7 0 5 3 10. 25. 40. 56. 71. 83. 93. 100. 108. 114. 119. 122. 124. 125. 126. 0.0 3 2|5 Bottom 7 5| 4 4 4 5 5 4 3

1. Determine the CBR value of a local dune sand to be used as a subgrade layer using the test results summarized in the below Table. Apply any necessary corrections. Penetrati 0.0 0.0 0.0 0.0 0.0 on (in.) Load at Top (Ub) Load at 0.1 0.1 02 46 8 0.1 2 4 0.16 0.18 0.2 0.22 0.24 0.26 0.28 0.3 20. 34. 50. 63. 77. 87. 103. 107. 112. 116. 120. 122. 124. 0.0 8.5 5 8 1 8 3 7 95.8 2 0 4| 7 0 5 3 10. 25. 40. 56. 71. 83. 93. 100. 108. 114. 119. 122. 124. 125. 126. 0.0 3 2|5 Bottom 7 5| 4 4 4 5 5 4 3

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

pavement ,

1. Determine the CBR value of a local dune sand to be used as a subgrade layer using the test
results summarized in the below Table. Apply any necessary corrections.
Penetrati 0.0 0.0 0.0 0.0 0.0 0.1 0.1
on (in.) 0 2 | 4 |6 8 0.1i 2
Load at
4 0.16 0.18 0.2 0.22 0.24 o.26 0.28 0.3
103. 107. 112. 116. 120. 122. 124.
20. 34. 50. 63. 77. 87.
Top (Ub)
Load at
0.0 8.5 5 818
3 7 95.8 2
4
7
10. 25. 40. 56. 71. 83. 93. 100. 108. 114. 119. 122. 124. 125. 126.
0.0 3
Bottom
2
5
4 5
4
5
4
3
2. Given the pavement structure presented in the blew Table and for a wheel load of 4500 1b.
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 k, 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, k, and k and k, 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.
Material Type
Asphalt Concrete
Layer No.
Thickness (in.)
Modulus (psi)
Poisson's Ratio
1
4.0
400,000
0.35
2
Base Course
8.0
50,000
0.40
Silty Clay Subgrade
3
Infinite
10,000
0.45
3. The table below includes the coefficients of both the dynamic modulus (E*) sigmoidal
function and the shift factor-temperature function. Determine the [E*| at the mid of the
asphalt concrete layer of the pavement structure given in Question 2 for the following two
conditions:
a. The pavement temperature at the mid of asphalt layer is 50 °F and the traffic speed is 70
mph.
b. The pavement temperature at the mid of asphalt layer is 100 °F and the traffic speed is 30
mph.
c. Discuss the results
a
4.810
1.731
0.557
0.628
0.00015
-0.101
6.316

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