Current truck traffic volumes (in AADTT) for a six-lane highway are shown in the table below. An asphalt pavement with a 20 year design life is to be designed according to the Hveem method. It is assumed that traffic volumes for each truck classification will grow linearly by 20 percent over the next 20 years. Current traffic Expanded Vehicle Type ESAL constant 20 year ESAL volume (AADTT) Volume 2-axle trucks 500 3-axle trucks 300 4-axle trucks 150 5-axle or more trucks 750 Total

Current truck traffic volumes (in AADTT) for a six-lane highway are shown in the table below. An asphalt pavement with a 20 year design life is to be designed according to the Hveem method. It is assumed that traffic volumes for each truck classification will grow linearly by 20 percent over the next 20 years. Current traffic Expanded Vehicle Type ESAL constant 20 year ESAL volume (AADTT) Volume 2-axle trucks 500 3-axle trucks 300 4-axle trucks 150 5-axle or more trucks 750 Total

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The pavement that need to be constructed is a six-lane divided highway. The present AADT (both directions) of 6000 vehicles is expected to grow at 5% per annum. The percent of traffic on the design lane is 45%. Determine the design ESAL if the design life is 20 years and the vehicle mix is: Passenger cars (1000 lb/axle) 60% 2-axle single-unit trucks (5000 lb/axle) = 30% 3-axle single-unit trucks (7000 lb/axle) 10% %3D Dosign the navement (with the design ESAL calculated in auestion 3a)
section of a two-lane rural highway is to be realigned and replaced by a four-lane highway with a full-depth asphalt pavement. Consists of 40% trucks. If classification studies have shown that the truck factor can be taken as 0.45, design a suitable flexible pavement using the 1993 AASHTO procedure if the AADT on the design lane during the first year of operation is 1000. It is expected that construction will be completed five years from now, and pi =4.5 and pt = 2.5. Growth rate = 4%. Design life = 20 years. The pavement structure will be exposed to moisture levels approaching saturation 20% of the time, and it will take about one week for drainage of water. Effective CBR of the subgrade material is 7. CBR of the base and subbase are 70 (Mr=30000 lb/in2 ) and 22 (Mr=13500 lb/in2 ), respectively, and Mr for the asphalt mixture, 400,000 lb/in2 .
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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 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 pavement (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 is 42 percent, pt = 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…
Q. 4 a) Why should the effective structural capacity of an existing pavement earmarked for rehabilitation to extend its service life be evaluated? b) The following expression is associated with the use of the Falling Weight Deflectometer (FWD) on pavements earmarked for rehabilitation. 1.5pa d, = Mg MR %3D E, i. What is the structural transformation required to make the use of the above expression possible? Which parameters in the expression relate to the transformation? I1. Identify the parameters in the expression which are obtained from the FWD test and briefly III. describe how the setup of the test enables those parameters to be obtained. [You may use any relevant expression(s) or equation(s) to support your explanation.]
What is the average skid resistance of the pavement surface when a vehicle travelling at a speed of 36 kmph was stopped by applying brakes fully? (Assume the skid marks were 8 m in Length.)
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.
A section of a two-lane rural highway is to be realigned and replaced by a four-lane highway with a full-depth asphalt pavement. The AADT (both ways) on the existing section can be represented by 750 ESAL. It is expected that construction will be completed 5 years from now. If the traffic growth rate is 2 percent and the effective CBR of the subgrade on the new alignment is 9.0, determine a suitable depth of the asphalt pavement (in inches) using the AASHTO method. Take the design life of the pavement as 20 years. The resilient modulus of the asphalt (EAC) is 450,000 lb/in. ². Assume m; for the subgrade is 1 and the percent of traffic on the design lane is 45 percent. Use a reliability level of 90 percent, a standard deviation of 0.45, and a design serviceability loss of 2.0. 8.25 inches
A pavement designer has arrived at a design traffic of 100 million standard axles for a newly developing national highway as per IRC:37 guidelines using the following data: design life = 15 years, commercial vehicle count before pavement construction = 4500 vehicles/day, annual traffic growth rate = 8%. The vehicle damage factor used in the calculation was A B с 1.53 2.24 3.66 D 4.14
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A flexible pavement has the following class of loads during a particular hour of the day. i. 80 buses with 2-axles (each axle load of 40 KN); ii. 160 trucks with 2-axles (front and rear axle loads of 40 kN and 80 kN, respectively) The equivalent standard axle load repetitions for this vehicle combination as per IRC: 37-2012 would be