by a 6-lane divided expressway (3 lanes in each direction). Traffic volume data on the highway indicate that the AADT (both directions) during the first year of operation is 24,000 with the following vehicle mix and axle loads. Passenger cars = 50 percent 2-axle single-unit trucks (12,000 lb/axle) = 40 percent 3-axle single-unit trucks (16,000 lb/axle) = 10 percent The vehicle mix is expected to remain the same throughout the design life of 20 years, althoug
by a 6-lane divided expressway (3 lanes in each direction). Traffic volume data on the highway indicate that the AADT (both directions) during the first year of operation is 24,000 with the following vehicle mix and axle loads. Passenger cars = 50 percent 2-axle single-unit trucks (12,000 lb/axle) = 40 percent 3-axle single-unit trucks (16,000 lb/axle) = 10 percent The vehicle mix is expected to remain the same throughout the design life of 20 years, althoug
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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An existing rural 4-lane highway is to be replaced by a 6-lane divided expressway (3 lanes in each direction). Traffic volume data on the highway indicate that the AADT (both directions) during the first year of operation is 24,000 with the following vehicle mix and axle loads.
Passenger cars = 50 percent
2-axle single-unit trucks (12,000 lb/axle) = 40 percent
3-axle single-unit trucks (16,000 lb/axle) = 10 percent
The vehicle mix is expected to remain the same throughout the design life of 20 years, although traffic is expected to grow at a rate of 3.5 percent annually. Using the AASHTO design procedure, determine the minimum depth of concrete pavement required for the design period of 20 years.
Transcribed Image Text:An existing rural 4-lane highway is to be replaced by a 6-lane divided expressway (3 lanes in each
direction). Traffic volume data on the highway indicate that the AADT (both directions) during the first
year of operation is 24,000 with the following vehicle mix and axle loads.
Passenger cars = 50 percent
2-axle single-unit trucks (12,000 lb/axle) = 40 percent
3-axle single-unit trucks (16,000 lb/axle) = 10 percent
The vehicle mix is expected to remain the same throughout the design life of 20 years, although
traffic is expected to grow at a rate of 3.5 percent annually. Using the AASHTO design procedure,
determine the minimum depth of concrete pavement required for the design period of 20 years.
P, = 4.5
P = 2.5
S' = 650 lb/in.?
E = 5 × 10 lb/in.2
k = 130 lb/in.³
J = 3.2
C, = 1.0
S = 0.3
R = 95%
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