A six-lane divided highway is to be designed to replace an existing highway. The present AADT (both directions) of 5,700 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.
A six-lane divided highway is to be designed to replace an existing highway. The present AADT (both directions) of 5,700 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.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A six-lane divided highway is to be designed to replace an existing highway. The present AADT (both directions) of 5,700 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) = 64%
2-axle single-unit trucks (5,000 lb/axle) = 27%
3-axle single-unit trucks (7,000 lb/axle) = 9%
Total ESAL =
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