The predicted traffic mix of a proposed four-lane urban non-interstate freeway is as follows.Passenger cars=78%Single-unit trucks:2-axle, 5,000 lb/axle=12%2-axle, 9,000 lb/axle=4%3-axle or more, 23,000 lb/axle=3%Tractor semitrailers and combinations:3-axle, 20,000 lb/axle=3%The projected AADT during the first year of operation is 3,900 (both directions). If the traffic growth rate is estimated at 3 percent and the CBR of the subgrade is 7.5, determine the depth of a full-asphalt pavement (in inches) using the AASHTO method and n = 20 years. The resilient modulus of the asphalt (EAC) is 320,000 lb/in2. Assume mi for the subgrade is 1 and the percent of traffic on the design lane is 42 percent, pt = 2.5, and SN = 4. Use a reliability level of 90 percent, a standard deviation of 0.45, and a design serviceability loss of 2.0. Assume the design lane factor fd is 0.42. (Use single-axle load equivalency factors for 2-axle vehicles and tandem-axle load equivalency factors for 3-axle vehicles.) Your response differs from the correct answer by more than 10%. Double check your calculations. inches The predicted traffic mix of a proposed four-lane urban non-interstate freeway is as follows.Passenger cars = 78%Single-unit trucks:2-axle, 5,000 lb/axle = 12%2-axle, 9,000 lb/axle = 4%3-axle or more, 23,000 lb/axle = 3%Tractor semitrailers and combinations:3-axle, 20,000 lb/axle = 3%The projected AADT during the first year of operation is 3,900 (both directions). If the traffic growth rate is estimated at3 percent and the CBR of the subgrade is 7.5, determine the depth of a full-asphalt pavement (in inches) using the AASHTOmethod and n = 20 years. The resilient modulus of the asphalt (EAC) is 320,000 lb/in². Assume m; for the subgrade is 1and the percent of traffic on the design lane is 42 percent, p₁ = 2.5, and SN = 4. Use a reliability level of 90 percent, astandard deviation of 0.45, and a design serviceability loss of 2.0. Assume the design lane factor fd is 0.42. (Use single-axle load equivalency factors for 2-axle vehicles and tandem-axle load equivalency factors for 3-axle vehicles.)Your response differs from the correct answer by more than 10%. Double check your calculations. inches

Step 1: Calculate the ESAL for the Traffic MixFirst, we need to convert the traffic mix into…

Answered: The predicted traffic mix of a proposed…

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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The predicted traffic mix of a proposed four-lane urban non-interstate freeway is as follows.

Passenger cars=78%Single-unit trucks:2-axle, 5,000 lb/axle=12%2-axle, 9,000 lb/axle=4%3-axle or more, 23,000 lb/axle=3%Tractor semitrailers and combinations:3-axle, 20,000 lb/axle=3%

The projected AADT during the first year of operation is 3,900 (both directions). If the traffic growth rate is estimated at 3 percent and the CBR of the subgrade is 7.5, determine the depth of a full-asphalt pavement (in inches) using the AASHTO method and

n = 20 years.

The resilient modulus of the asphalt

(E_AC)

is 320,000 lb/in². Assume

m_i

for the subgrade is 1 and the percent of traffic on the design lane is 42 percent,

p_t = 2.5,

and

SN = 4.

Use a reliability level of 90 percent, a standard deviation of 0.45, and a design serviceability loss of 2.0. Assume the design lane factor

f_d

is 0.42. (Use single-axle load equivalency factors for 2-axle vehicles and tandem-axle load equivalency factors for 3-axle vehicles.)