Following are general guidelines: Highway Conditions High volume urban High volume rural Low volume paved Low volume aggregate surface Analysis Period (years)Ģ.1.1Time Constraints This section involves the selection of performance and analysis period inputs which affect (or constrain) pavement design from the dimension of time. For high-volume urban freeways, longer analysis periods may be considered. Consideration should be given to extending the analysis period to include one rehabilitation. It is now recommended that consideration be given to longer analysis periods, since these may be better suited for the evaluation of alternative long-term strategiesbasedon life-cycle costs.
In the past, pavements were typically designed and analyzed for a 2O-yearperformance period, since the original Interstate Highway Act in 1956required that traffic be considered through 1976. Becauseof the consideration of the maximum performance period, it may be necessary to consider and plan for stage construction (i.e., an initial pavement structure followed by one or more rehabilitation operations) to achieve the desired analysis period. The analysis period is analogous to the term design life used by designers in the past. This refers to the period of time for which the analysis is to be conducted, i.e., the length of time that any designstrategymust cover. Thus, if life-cyclecostsare to be considered accurately, it is important to give some consideration to the maximum practical performance period of a given pavement type. The selection of longer time periods than can be achieved in the field will result in unrealistic designs. This limiting time period may be the result of PSI loss due to environmental factors, disintegration of surface, etc. II-7 areas that pavements originally designed to last 20 years required some type of rehabilitation or resurfacing within l5 years after initial construction. Thus, the designer must use meon values and standard deviations associatedwith his conditions. This book, or parts thereof, may not be reproduced in any form without written permission of the publishers.ĭesign Requirements section), it is strongly recommended that the designer use mean (average) values rather than "conservative estimates"for each of the designinputs requiredby the procedures.This is important sincethe equationswere developed using mean values and actual variations. 1986,by the American Association of State Highway and Transportation 0fficials.
Publishedby the American Association of State Highway and Transportation OfficialsIt44 N. It can also be used to perform loss of support analysis and load transfer efficiency (LTE) calculations.UIDE G FOR S DESIGN FPAVEMENT TRUCTURES O 1986 The tool is capable of analyzing raw deflection data files obtained from Falling Weight Deflectometer (FWD) testing devices, backcalculating in-place elastic layer moduli for flexible and rigid pavements and generating inputs for performing rehabilitation design using Pavement ME. The Pavement ME Deflection Data Analysis and Backcalculation Tools is a standalone software program that can be used to generate backcalculation inputs to the AASHTO Pavement ME Design software for rehabilitation design. ME Design is a production-ready software tool to support the day-to-day pavement design functions of public and private pavement engineers.
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ME Design supports AASHTO"s Mechanistic-Empirical Pavement Design Guide, Interim Edition: A Manual of Practice. AASHTOWare Pavement ME Design is a pavement design software, which builds upon the mechanistic-empirical pavement design guide, and expands and improves the features in the accompanying prototype computational software.