• Question 26The maximum wheel loadthat the pavement could carry is 120kN. If the contact radius of the wheelis assumed to be 250 mm,andsubgrade bearing capacity isequivalent to 0.24 Megapascals,calculate the subgrade layerthickness of the flexible pavement inmm using the 45-deg cone pressuredistribution method.

Answered: Image /qna-images/answer/f452066c-88dc-4005-8f73-9cd9666e6483.jpg

Answered: The maximum wheel load that the…

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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Q5. Given the following information: A concrete pavement for two lane highway has doweled joints and no concrete shoulders. The modulus of subgrade reaction is 200 pci (54.2MN/m3), and the modulus of rupture is 650 psi (4.5Mpa). Assume a load safety factor of 1.1. truck weight distribution data for single axle load is as follows: Axle load(kips) 1 Single axles 28 Multiplied by LSF (1.1) 26 24 2 Expected repetitions 3 Erosion analysis Allowable repetitions 30.8 5,913 28.6 12,483 26.4 15,111 22 24.2 102,492 Using a trial thickness of 8 in. Fill in the empty spaces using PCA design method 4 6. Erosion factor Erosion percent 5
Q2) A wheel load with circular area has a radius 6 in. and uniform pressure 552 kPa is applied on a two-layer system, consists of asphalt layer has an elastic modulus of 350000 psi and stabilized subgrade has elastic modulus 70000 psi. The subgrade can support a maximum vertical stress allowing for allowable number of stress repetitions of 2.5 x 109 before occurring of permanent deformation. Calculate the required thickness of a full-depth pavement, deflection in pavement and the critical tensile strain at the bottom of asphalt layer.
By the Asphalt Institute method, determine the allowable ESAL for a 3.5-inch overlay on an asphalt pavement with a representative rebound deflection of 0.075 inches. E2 = (1.5x70x6.4)/0.062 = 10840 psi Deflection = 0.04621 ESAL = 347000
13. Refer to Figure 3.1 attached. In the flexible pavement design example illustrated in the figure, what would be the required structural number if designing for W18=2,000,000 instead?a. 1.5b. 4.3c. 6.1d. 7.3
07. Determine Structural Number and terminal serviceability index value of flexible pavement. Given B and G, value for 32-kip tandem-axle loads. B= 0,4 G= -0.22
12. Refer to Figure II-1 attached. A flexible pavement is to be evaluated according to the AASHTO 1972 design guide. The existing pavement has a weighted structural number=3.4, a regional factor=2.0, and a soil support value=4.5. What would be the approximated number of daily equivalent 18-kip axles to be allowed on this road for a 20-year analysis period?a. 10b. 33c. 100d. 1490
A dual wheel having a load per tire of 4000 Ib, 80 psi pressure and μ = 0.5. Calculate thetotal pavement deflections due to the dual wheel by two layer theory at the followingradial distances from the centerline of one tire: r=0, 7,14. Assume that E1 = 10 E2
27. The PCA design methodology for airfield rigid pavements is based on the interior bending stress at the bottom of the slab.a. Trueb. False
A conventional flexible pavement has been periodically checked for accumulated permanent deformations in various layers using a multi-depth deflectometer (MDD). The following subgrade soil rut data were obtained: Subgrade Soil Rut (in.) Number of 18-kip Axle Loads 0.1 10,000 0.225 100,000 Estimate the rut depth contributed by the subgrade soil for 1-million 18-kip axle loads.
Rigid pavements distribute loads more efficiently than flexible pavements. True/False Please explain in detail
The overall standard deviation in the flexible pavement design equation accounts for the variation in the loading, materials and the construction practices. O True O False

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