Simplified M-E Approach for the Design of Flexible Pavement Structures

Simplified M-E Approach for the Design of Flexible Pavement Structures

Osama Abaza

almabaza@hotmail.com

Civil Engineering Department, Faculty of Science, An-Najah National University, Nablus, Palestine

Received : 13-05-2006 , Accepted : 04-04-2007

Language: English

Abstract

This paper presents a simplified design procedure, which depends mainly on finite elements analysis considering the same input variables used in the traditional AASHTO empirical design methodology. The multiple regression equation developed considered the subgrade resilient modulus (Mr), Equivalent Single Axle Load (ESAL) repetitions, and the dynamic behavior of flexible pavements by incorporating vehicle speed. The outputs of this model are given in terms of structural number (SN) making it easier for the designer to deal with the various pavement thickness as per the traditional AASHTO procedure. Based on the model developed for static loading, SN values were approximately -6 to 7 percent compared to those of AASHTO design methodology depending on number of 18 kips single axle load repetitions. In the analysis of the dynamic behavior of pavements, SN dropped up to 30 percent for the practical design speeds that could be considered for pavement design purposes.

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