Simplified Methods for Calculating Aircraft Load Repetition

Abstract:

The paper presents a discussion on the simplified methods for calculating aircraft load repetition,which is used in mechanistic-empirical pavement design procedure.A simplified concept based on stress/strain spread angle and equivalent width is put forward as the basis of load repletion calculation.The results based on double pavement layers analysis show that the equivalent width is the function of top layer thickness and relative stiffness of the layers.Then,the simplified equations for calculating equivalent width are put forward.The width differences between simplified method and spatial response-based method are within 5%.The pavement with more than two layers can be transferred to two layers according the equivalent approach.With the equivalent width,load repetition methods are developed for single tire,and a detailed analysis is made of the multiple tires and multiple axles as well.Furthermore,the equations with a consideration of the mixed traffic are put forward.