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 avement (in inches) using the AASHTO method and n = 20 years. The resilient modulus of the asphalt (EAC) is 320,000 lb/in2. Assume m, for the subgrade is 1 and the percent of traffic on the design lane i 2 percent, p, 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 is 0.42. (Use single-axle load equivalency factors for 2-axle vehicles and tandem-axle load equivalency factors for 3-axle vehicles.) 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 at 3 percent and the CBR of the subgrade is 7.5, determine the depth of a full-asphalt avement (in inches) using the AASHTO method and n = 20 years. The resilient modulus of the asphalt (EAC) is 320,000 lb/in2. Assume m, for the subgrade is 1 and the percent of traffic on the design lane i 2 percent, p, 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 is 0.42. (Use single-axle load equivalency factors for 2-axle vehicles and tandem-axle load equivalency factors for 3-axle vehicles.) inches
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 Annual Average Daily Traffic (AADT) during the first year of operation is 3,900 (both directions). If the traffic growth rate is estimated at 3 percent and the California Bearing Ratio (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.)
[Input box for answer] inches](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5d720e68-4285-464d-8dda-3c1128b35873%2Fd8b0355d-278b-495b-8659-ec666b1ad78b%2Fsvx307j_processed.jpeg&w=3840&q=75)
Transcribed Image Text: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 Annual Average Daily Traffic (AADT) during the first year of operation is 3,900 (both directions). If the traffic growth rate is estimated at 3 percent and the California Bearing Ratio (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.)
[Input box for answer] inches
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