https://engineering.purdue.edu/~flm/CE 361_files/ICDP4-361-13.pdf <-question p=\

Question

https://engineering.purdue.edu/~flm/CE 361_files/ICDP4-361-13.pdf <-question p="">

For this exercise, you are to design a northbound section of interstate that is to carry

150,000 travelers a day (excluding truck occupants). The vehicles that carry these

people include; (1) personal vehicles (average occupancy of 1.2 people per car) 2-2 kip

single axles, and (2) buses with 2-22 kip single axles (assume they are filled with an

average of 40 passengers). There are also trucks on the roadway and all trucks have 1-40

kip triple axle, 1-32 kip tandem axle, and 1-8 kip single axle. You know that the soil CBR

is 6, the initial PSI is 4.5 and the TSI is 2.5. Other values to be used:

- All drainage coefficients = 1.0

- Reliability = 90%

- Overall standard deviation of traffic = 0.50

- Concrete Modulus of Elasticity = 5.5 million lb/in2

- Concrete Modulus of Rupture = 750 lb/in2

- PCC load transfer coefficient = 3.0

Design a rigid and flexible pavement, to last 15 years, for a four-lane road (four lanes in

the northbound design direction) with 600 trucks per day in the design direction, and 5%

of all travelers going by bus (the rest go in personal vehicles).

Sketch cross-section of your two pavement designs and show all parameter assumptions.

Do not forget to determine the amount of traffic that will be in the "design Lane" before

beginning your computations

Explanation / Answer

Procedure: ? Determine W18 for rigid and W18 for flexible (they will not be the same). Assume SN =4 and D =10 to get the axle-load equivalence factors. ? Determine design lane W18 for 4 lanes (design conservatively). See Table 4.10. ? For flexible pavement, select layer materials and thicknesses using Eq. 4.3 SN 1 1 2 2 2 3 D3 M3 ? a D ? a D M ? a . Assume all but one D, and solve for it (as done in Example 4.1 on page 110).

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