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 year. 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: Passenger cars (4.44kN/axle) = 60% 2-axle single unit trucks (22.2kN/axle) = 30% 3-axle single unit trucks (31.11kN/axle) = 10%

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 year. 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: Passenger cars (4.44kN/axle) = 60% 2-axle single unit trucks (22.2kN/axle) = 30% 3-axle single unit trucks (31.11kN/axle) = 10%

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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Concept explainers

Capacity and Level of Service at Intersections

The term capacity is associated with transportation engineering. Capacity helps to understand how many pedestrians or vehicles can be handled by a transport facility. Level of service is also a term associated with transportation engineering. The level of service indicates the performance of the transport facility.

Question

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 year. 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:
Passenger cars (4.44kN/axle) = 60%
2-axle single unit trucks (22.2kN/axle) = 30%
3-axle single unit trucks (31.11kN/axle) = 10%

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Step 1 Equivalent Single Axle Load

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Step 2 Analyze each term of ESAL

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Step 3 Identify the load equivalency factor

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Step 4 2 axle SUT (22.2 KN/ axle)

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Step 5 3 axle SUT (31.11 KN/ axle)

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Step 6 Final Design ESAL

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A four-lane rural freeway segment has a 510 m grade length of 2% upgrade followed by a 630 m grade length of 3%. The freeway has 3.4-m lane, 1.5m left-shoulder lateral clearances and interchanges spaced at every 25 km. During the peak hour, there are 6% trucks, 2% buses, 2% recreational vehicles and the rest are passenger cars. Driver population adjustment is determined to be 0.90, peak hour factor is 0.90 and the BFFS is 110 km/h. At present, the freeway operates at capacity during the peak hour in the direction in question. If an additional 3.4 m lane is introduced, and all other factors stay the same, what will be the new level of service?
Step by step solutionProblem 3: A four-lane freeway (two lanes in each direction) operates at capacity during the peak hour. It has 11-ft lanes, 5-ft shoulders, and there are 3 ramps within 3 miles upstream of the segment midpoint and 3 ramps within 3 miles downstream of the segment midpoint. The freeway is on rolling terrain and has 10% heavy vehicles with a PHF of 0.9. It is known that 15% of the AADT occurs in the peak hour and the directional factor is 0.7. Determine: (a) Heavy vehicle adjustment factor(b) Free-flow speed(c) Capacity(d) Volume-to-capacity ratio(e) Density and LOS(f) AADT(g) What is the highest possible value of the heavy vehicle adjustment factor? (h) If the volume exceeds capacity, what is the LOS? Note: No need to show calculations for (g) and (h).
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…
A two-lane, one-way, rural freeway segment is being designed to service a demand volume of 4,000 vehicles per hour. The PHF is expected to be 0.95. If the combination of trucks, buses, and recreational vehicles is represented by a heavy vehicle adjustment of 0.85, what is the flow rate (pcphpl)? Provide your answer to the nearest integer.