1. Discuss the structural components of a flexible pavement 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 pi = 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 vehidle 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%
1. Discuss the structural components of a flexible pavement 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 pi = 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 vehidle 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%
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:1. Discuss the structural components of a flexible pavement
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 pe = 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%
3. The following data is obtained from the axle load survey conducted for 3 days.
Axle Load (kN) No. of axles
Ave. axle load
LEF = (Li/Lso )* ESAL80
30 to 40
50
40 to 50
69
50 to 60
66
60 to 70
79
70 to 80
100
80 to 90
98
90 to 100
111
100 to 110
78
110 to 120
68
120 to 130
78
130 to 140
51
140 to 150
56
Determine the following:
3.1. Average axle load, load equivalent factor (LEF)
3.2. Equivalent number of axle loads
3.3. 80 kN ESAL repetitions for 3 days
3.4. 80 kN ESAL repetitions per year
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