A flexible pavement with SN = 4 and TSI = 2.5 carries the following vehicles: • Cars (39,466/ day): Two 4000 lb single axles each Single unit trucks (141/ day): One 12,000 lb single axle, One 48,000 tandem axle What is the yearly equivalent traffic load (in 18 kip ESALs)?

A flexible pavement with SN = 4 and TSI = 2.5 carries the following vehicles: • Cars (39,466/ day): Two 4000 lb single axles each Single unit trucks (141/ day): One 12,000 lb single axle, One 48,000 tandem axle What is the yearly equivalent traffic load (in 18 kip ESALs)?

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

A flexible pavement with SN = 4 and TSI = 2.5 carries the following vehicles:
Cars (39,466/ day): Two 4000 lb single axles each
Single unit trucks (141/ day): One 12,000 lb single axle, One 48,000 tandem axle
What is the yearly equivalent traffic load (in 18 kip ESALs)?

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The pavement that need to be constructed is a six-lane divided highway. The present AADT (both directions) of 6000 vehicles is expected to grow at 5% per annum. The percent of traffic on the design lane is 45%. Determine the design ESAL if the design life is 20 years and the vehicle mix is: Passenger cars (1000 lb/axle) 60% 2-axle single-unit trucks (5000 lb/axle) = 30% 3-axle single-unit trucks (7000 lb/axle) 10% %3D Dosign the navement (with the design ESAL calculated in auestion 3a)
A six-lane divided highway is to be designed to replace an existing highway. The present AADT (both directions) of 5,300 vehicles is expected to grow at 5 percent per annum. Assume SN = 4 and pt = 2.5. The percent of traffic on the design lane is 45 percent. Determine the design ESAL if the design life is 20 years and the vehicle mix is as follows. (Assume the contribution of passenger car traffic to the total ESAL is negligible. Use single-axle load equivalency factors for 2-axle and 3-axle trucks.) Passenger cars (1,000 lb/axle)=59%2-axle single-unit trucks (5,000 lb/axle)=25%3-axle single-unit trucks (7,000 lb/axle)=16%
1) A six-lane highway (3 lanes in each direction) is to be designed to replace an existing highway. The present AADT in one direction is 6000 and is expected to grow at 3% per year. Assume SN = 4 and p = 2.5. Determine the design ESAL if the design life is 30 years and the vehicle mix is: Passenger cars (2000 lb/axle) = 60% 2-axle single unit trucks (6000 lb/axle) = 30% 3-axle single unit trucks (12000 lb/axle) = 10% 2) Using the ESAL obtained in Problem #1, design a flexible pavement for an interstate highway. Use the following information: R=95% and So = 0.45 Modulus of asphalt concrete = 400,000 psi Mr of base course material = 30,000 psi Mr of subbase material = 15,000 psi Mr value of subgrade = 8,000 psi Assume initial seviceability index = 4.5 and terminal serviceability index = 2.5. The pavement is to be exposed to moisture level approaching saturation more than 25% of the time. Quality of drainage is fair.
• Question 26 The maximum wheel load that the pavement could carry is 120 kN. If the contact radius of the wheel is assumed to be 250 mm, and subgrade bearing capacity is equivalent to 0.24 Megapascals, calculate the subgrade layer thickness of the flexible pavement in mm using the 45-deg cone pressure distribution method.
Problem 2 only
Aggregates from a material storage site are required for the embankment of a roadway. The porosity of the aggregates at the storage is 75% and it is desired that these be compacted until a porosity of 20% is reached. The section of current interest for the embankment is 8m wide, 1.2m compacted thickness and 220m long. Compute the total cost if each truckload of aggregates to be transported will cost around 3550.00 and each truckload has a capacity of 7m3.
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