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原文传递 Calibration of Pavement Response Models for the Mechanistic-Empirical Pavement Design Method.

题名：	Calibration of Pavement Response Models for the Mechanistic-Empirical Pavement Design Method.
作者：	luo, r. prozzi, j. a.
关键词：	pavement design,methodologies,tire-pavement contact,contact stress/tire inflation pressure, pavement response, pavement strains, pavement fatigue life/
摘要：	Most pavement design methodologies assume that the tire-pavement contact stress is equal to the tire inflation pressure and uniformly distributed over a circular contact area. However, tire-pavement contact area is not in a circular shape and the contact stress is neither uniform nor equal to the tire inflation pressure. To precisely account for the effect of actual contact stress on pavement responses, this research evaluates pavement responses under the 3-D non-uniform stresses and under the uniform stress. The studied pavement responses include the horizontal strains at the pavement surface, the horizontal strains at the bottom of the asphalt layer, and the vertical strains at the top of subgrade. A multi-layer linear-elastic computer program, CIRCLY, is used to estimate pavement strains under a number of combinations of tire load, tire pressure, asphalt modulus, asphalt thickness and subgrade modulus. The Asphalt Institute method and the Shell method are used to predict the pavement fatigue life based on the critical strains at the bottom of the asphalt layer calculated by both 3-D stress model and the uniform stress model. / NOTE: Rept. for 1 Sep 06-31 Aug 07. / Supplementary Notes: Sponsored by Southwest Region Univ. Transportation Center, College Station, TX., Texas Dept. of Transportation, Austin. and Federal Highway Administration, Austin, TX. Texas Div. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
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