1-581 is being continued eastbound in Roanoke. The existing freeway consists of two lanes in each direction of flexible pavement with a structural number of 5 and a subgrade CBR of 6. If the pavement is conservatively designed, how many years longer will the pavement last if a third lane is added given the following conditions for the updated design? An overall standard deviation of 0.35 and reliability of 90%. • Initial design PSI of 4.6, with the final PSI of 2.5. Anticipated design traffic is: 23,000 vehicles per day, where the design passenger car has two 1,000-lb single axles. • 3,000 trucks per day, where the design truck has a 12,000-lb single axle and two 32,000-lb tandem axles.
1-581 is being continued eastbound in Roanoke. The existing freeway consists of two lanes in each direction of flexible pavement with a structural number of 5 and a subgrade CBR of 6. If the pavement is conservatively designed, how many years longer will the pavement last if a third lane is added given the following conditions for the updated design? An overall standard deviation of 0.35 and reliability of 90%. • Initial design PSI of 4.6, with the final PSI of 2.5. Anticipated design traffic is: 23,000 vehicles per day, where the design passenger car has two 1,000-lb single axles. • 3,000 trucks per day, where the design truck has a 12,000-lb single axle and two 32,000-lb tandem axles.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:1-581 is being continued eastbound in Roanoke. The
existing freeway consists of two lanes in each direction
of flexible pavement with a structural number of 5 and
a subgrade CBR of 6. If the pavement is conservatively
designed, how many years longer will the pavement
last if a third lane is added given the following
conditions for the updated design?
An overall standard deviation of 0.35 and reliability
of 90%.
• Initial design PSI of 4.6, with the final PSI of 2.5.
Anticipated design traffic is:
23,000 vehicles per day, where the design
passenger car has two 1,000-lb single axles.
• 3,000 trucks per day, where the design truck has a
12,000-lb single axle and two 32,000-lb tandem
axles.
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