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 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…
The predicted traffic mix of a proposed four lane urban non-interstate freeway: Passenger cars (4.44KN/axle) = 69% 2-axle single unit trucks (22.2kN/axle) = 20% 2-axle single unit trucks (40KN/axle) = 5% 3-axle or more single unit trucks (100KN/axle) = 4% 3-axle or tractor semitrailers and combinations (90kN/axle) = 2% %3D %3D %3D The projected AADT during the first year of operation is 3500 (both directions). If traffic growth rate is estimated at 4%, percent of traffic on the design lane is 42%, pt =2.5 and SN =3, determine the design ESAL at the design life of 20 years.
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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.
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Q: What is Strategic Highway Research Program? What are the main causes of asphalt aging? Discuss in detail. Subject: Pavement Structure and design. Program: MS in Transportation Engineering.
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
Subject : Transportation Engineering Give me both a and b right solutions A 5 tonne wheel load is applied on a pavement and generates a surface deflection of 0.15 mm. (a) If the equivalent radius of tyre contact is 100 mm and Poisson’s ratio is 0.3, what is the pavement’s modulus of elasticity? (b) If the pavement is 125 mm thick, what is the vertical stress at the top of the subgrade?
A roadway project will be constructed in 2026 as flexible pavement, pt-2.5, expected SN= 4 and has a 20-year design life. Design work was done in 2021, with growth rate of 6%. The traffic survey gives axles loads shown in table above. Find the design ESAL according to AASHTO design method. Truck type Axle Category Type-1 1-single axle of 30 kips 1- tandem axle of 32 kips 1-single axle of 18 kips 2- tandem axle of 40 kips 1-single axle of 20 kips 1- tandem axle of 36 kips 1- tandem axle of 50 kips 2-single axle of 22 kips 1- tandem axle of 38 kips 2-single axle of 38 kips 1- tandem axle of 52 kips 2-single axle of 14 kips 1- tandem axle of 32 kips 1- triple axles of 50 kips 1-single axle of 40 kips 1- tandem axle of 32 kips CS Cams Typer triple axies of 58 kips Type-2 Type-3 Type-4 Type-5 Type-6 % Total AADT 9% 10% 7% 5% 3% 5% 4%