A six-lane major highway with three lanes in each direction will be built using concrete pavement. The lane distribution factor of traffic is 0.40. Traffic survey on the highway indicates that the AADT (average annual daily traffic) during the first year of operation is 24,000 with the following vehicle mixes and axle loads. Passenger cars = 50% 2-axle single-unit trucks (two single axles at 12,000 lb/axle) = 40% 3-axle single trailer trucks (three single axles at 16,000 lb/axle) = 10% 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% annually. Using the AASHTO 1993 design procedure, determine the minimum depth of concrete pavement required for the design period of 20 years. The following design parameters should be used. P₁ = 4.5 P₁ = 2.5 S = 650 lb/in.² E = 5 x 106 lb/in.² k=130 lb/in.³ J = 3.2 Ca = 1.0 So = 0.3 R = 95%

Structural Analysis
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Chapter2: Loads On Structures
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A six-lane major highway with three lanes in each direction will be built using
concrete pavement. The lane distribution factor of traffic is 0.40. Traffic survey on
the highway indicates that the AADT (average annual daily traffic) during the first
year of operation is 24,000 with the following vehicle mixes and axle loads.
Passenger cars = 50%
2-axle single-unit trucks (two single axles at 12,000 lb/axle) = 40%
3-axle single trailer trucks (three single axles at 16,000 lb/axle) = 10%
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% annually. Using the
AASHTO 1993 design procedure, determine the minimum depth of concrete
pavement required for the design period of 20 years. The following design
parameters should be used.
P₁ = 4.5
P₁ = 2.5
S' = 650 lb/in.²
E = 5 x 106 lb/in.²
k=130 lb/in.³
J = 3.2
Ca = 1.0
So = 0.3
R = 95%
Transcribed Image Text:A six-lane major highway with three lanes in each direction will be built using concrete pavement. The lane distribution factor of traffic is 0.40. Traffic survey on the highway indicates that the AADT (average annual daily traffic) during the first year of operation is 24,000 with the following vehicle mixes and axle loads. Passenger cars = 50% 2-axle single-unit trucks (two single axles at 12,000 lb/axle) = 40% 3-axle single trailer trucks (three single axles at 16,000 lb/axle) = 10% 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% annually. Using the AASHTO 1993 design procedure, determine the minimum depth of concrete pavement required for the design period of 20 years. The following design parameters should be used. P₁ = 4.5 P₁ = 2.5 S' = 650 lb/in.² E = 5 x 106 lb/in.² k=130 lb/in.³ J = 3.2 Ca = 1.0 So = 0.3 R = 95%
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