EBK PRINCIPLES OF HIGHWAY ENGINEERING A
6th Edition
ISBN: 9781119299332
Author: WASHBURN
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Chapter 2, Problem 35P
To determine
The minimum tractive effort required for the vehicle to maintains its given speed.
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The following figure is a flexible pavement system with the resilient
moduli layer coefficients and drainage coefficients as shown. If the predicted ESAL
= 6x106, Reliability, R = 99%, Standard Deviation (So) = 0.45, and APSI = 2.5,
select thicknesses D1, D2, and D3 in accordance with the AASHTO Guide for
Design of Pavement Structures.
E₁ = 400, 000 psi; a₁ = 0.42, Thickness = D₁
E₂=30,000 psi; a₂= 0.14, m₂ = 1.2; Thickness = Dz
E=11,000 psi; a=0.08, m3 = 1.2; Thickness = D3
MR= 5,700 psi
Diagramtically show the placement, size, and spacing of temperature steels, dowel bars and tie bars in rigid pavements. Also mention their puproses in rigid pavements.
A six-lane concrete roadway is being designed for a metropolitan area. This
roadway will be constructed on a subgrade with an effective modulus of subgrade reaction k of 200 lb/in^3. The ESALs used for the design period is 6.0×10^6. Using the AASHTO design method, determine a suitable thickness of the concrete pavement (to the nearest 1/2 inch), provided that the working stress of the concrete to be used is 600 lb/in^2 and the modulus of elasticity is 6×10^6 lb/in^2. Assume the initial serviceability is 5.0 and the terminal serviceability is 2.0. Assume the overall standard deviation, So, is 0.35, the load transfer coefficient J as 3.2, the drainage coefficient, Cd, is 1.15, and R = 99%.
Chapter 2 Solutions
EBK PRINCIPLES OF HIGHWAY ENGINEERING A
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