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Unformatted text preview: design direction) with 400 trucks per day in the design direction, and 20% 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 (see Table 4.11). Procedure: • Determine W 18 for rigid and W 18 for flexible (they will not be the same). Assume SN =4 and D =10 to get the axle-load equivalence factors. • Determine design lane W 18 for 4 lanes (design conservatively). See Table 4.11. • For flexible pavement, select layer materials and thicknesses using Eq. 4.9 3 3 3 2 2 2 1 1 SN M D a M D a D a + + = . Assume all but one D , and solve for it (as done in Example 4.2 on page 114)....
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This document was uploaded on 03/15/2012.
- Spring '09