[2] A pavement structure composed of the following three layers: (5.75 in) HMA with elastic modulus 400,000 psi, (23 in) granular base with elastic modulus 20,000 psi, and a subgrade with elastic modulus 10,000 psi. All layers are assumed to have a Poisson ratio of 0.5. Calculate the maximum horizontal tensile strain at the bottom of HMA and the maximum vertical compressive strain on the top of subgrade under a 40,000-lb wheel load and 150-psi contact pressure.

[2] A pavement structure composed of the following three layers: (5.75 in) HMA with elastic modulus 400,000 psi, (23 in) granular base with elastic modulus 20,000 psi, and a subgrade with elastic modulus 10,000 psi. All layers are assumed to have a Poisson ratio of 0.5. Calculate the maximum horizontal tensile strain at the bottom of HMA and the maximum vertical compressive strain on the top of subgrade under a 40,000-lb wheel load and 150-psi contact pressure.

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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Concept explainers

Design of pavements

Pavement is a structure that is made up of different layers such as sub-base course layer, base course layer, binder course, and a surface course formed with different materials such as gravel, above the subgrade soil constructed to act as a path or carriageway enabling the movement of vehicles. The surface of the pavement should possess characteristics such as adequate friction, light reflection, and drainage. The pavements are classified based on structural design into rigid pavements, flexible pavements, composite pavements, and unpaved pavements. The process of determining a suitable pavement type, its constituent layers, and its thickness is called pavement design.

Question

[2] A pavement structure composed of the following three layers: (5.75 in)
HMA with elastic modulus 400,000 psi, (23 in) granular base with elastic
modulus 20,000 psi, and a subgrade with elastic modulus 10,000 psi. All
layers are assumed to have a Poisson ratio of 0.5. Calculate the maximum
horizontal tensile strain at the bottom of HMA and the maximum vertical
compressive strain on the top of subgrade under a 40,000-lb wheel load and
150-psi contact pressure.

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