1. An axle weight study on a section of a highway gave the following data on...

 

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1. An axle weight study on a section of a highway gave the following data on axle-load distribution: Axle Load Group: Single (1000 lb) <4 4-8 8-12 12-16 16-18 18-20 20-22 22-24 24-26 No. of Axles per 1000 Vehicles 678 775 500 150 60 40 7 4 3 Axie Loaa Group: Tandem (1000 lb) <6 6-12 12-18 18-24 24-30 30-32 32-34 34-36 36-38 38-40 No. of Axles per 1000 Vehicles 18 236 170 120 152 66 30 Passenger cars (1000 lb/axle) = 60% 2-axle single-unit trucks (5000 lb/axle) = 30% 3-axle single-unit trucks (7000 lb/axle) = 10% 12 4 1 Determine the truck factor for this section of highway. Assume SN = 4 and p = 2.5. 2. A six-lane divided highway is to be designed to replace an existing highway. The present AADT (both directions) of 6000 vehicles is expected to grow at 5% per annum. Assume SN = 4 and p = 2.5. 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: 3. Using the information given in Problem 2, design a suitable pavement consisting of an asphalt mixture surface with an elastic modulus of 250,000 lb/in2, a granular base layer with a structural coefficient of 0.14 on a subgrade having a CBR of 10. Assume all m.values = 1, and the percent of traffic on the design lane is 45%. Use a reliability level of 85%, a standard deviation of 0.45, and a design serviceability loss of 2.0. 4. The traffic on the design lane of a proposed four-lane rural interstate highway 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, and p = 4.2 and P₁ = 2.5. Growth rate = 4% Design life = 20 years Reliability level = 95% Standard deviation = 0.45. 1. An axle weight study on a section of a highway gave the following data on axle-load distribution: Axle Load Group: Single (1000 lb) <4 4-8 8-12 12-16 16-18 18-20 20-22 22-24 24-26 No. of Axles per 1000 Vehicles 678 775 500 150 60 40 7 4 3 Axie Loaa Group: Tandem (1000 lb) <6 6-12 12-18 18-24 24-30 30-32 32-34 34-36 36-38 38-40 No. of Axles per 1000 Vehicles 18 236 170 120 152 66 30 Passenger cars (1000 lb/axle) = 60% 2-axle single-unit trucks (5000 lb/axle) = 30% 3-axle single-unit trucks (7000 lb/axle) = 10% 12 4 1 Determine the truck factor for this section of highway. Assume SN = 4 and p = 2.5. 2. A six-lane divided highway is to be designed to replace an existing highway. The present AADT (both directions) of 6000 vehicles is expected to grow at 5% per annum. Assume SN = 4 and p = 2.5. 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: 1. An axle weight study on a section of a highway gave the following data on axle-load distribution: Axle Load Group: Single (1000 lb) <4 4-8 8-12 12-16 16-18 18-20 20-22 22-24 24-26 No. of Axles per 1000 Vehicles 678 775 500 150 60 40 7 4 3 Axie Loaa Group: Tandem (1000 lb) <6 6-12 12-18 18-24 24-30 30-32 32-34 34-36 36-38 38-40 No. of Axles per 1000 Vehicles 18 236 170 120 152 66 30 Passenger cars (1000 lb/axle) = 60% 2-axle single-unit trucks (5000 lb/axle) = 30% 3-axle single-unit trucks (7000 lb/axle) = 10% 12 4 1 Determine the truck factor for this section of highway. Assume SN = 4 and p = 2.5. 2. A six-lane divided highway is to be designed to replace an existing highway. The present AADT (both directions) of 6000 vehicles is expected to grow at 5% per annum. Assume SN = 4 and p = 2.5. 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: 3. Using the information given in Problem 2, design a suitable pavement consisting of an asphalt mixture surface with an elastic modulus of 250,000 lb/in2, a granular base layer with a structural coefficient of 0.14 on a subgrade having a CBR of 10. Assume all m.values = 1, and the percent of traffic on the design lane is 45%. Use a reliability level of 85%, a standard deviation of 0.45, and a design serviceability loss of 2.0. 4. The traffic on the design lane of a proposed four-lane rural interstate highway 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, and p = 4.2 and P₁ = 2.5. Growth rate = 4% Design life = 20 years Reliability level = 95% Standard deviation = 0.45. 3. Using the information given in Problem 2, design a suitable pavement consisting of an asphalt mixture surface with an elastic modulus of 250,000 lb/in2, a granular base layer with a structural coefficient of 0.14 on a subgrade having a CBR of 10. Assume all m.values = 1, and the percent of traffic on the design lane is 45%. Use a reliability level of 85%, a standard deviation of 0.45, and a design serviceability loss of 2.0. 4. The traffic on the design lane of a proposed four-lane rural interstate highway 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, and p = 4.2 and P₁ = 2.5. Growth rate = 4% Design life = 20 years Reliability level = 95% Standard deviation = 0.45.

Answer rating: 100% (QA)

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