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This paper describes a basis framework which is composed of an assemblage of mathematical models to form a structural subsystem intended to be used in the structural analysis of flexible pavements. Emphasis is placed upon describing the newer type laboratory tests which provide the necessary inputs for the operation of the structural subsystem computer program package referred to in this paper as VESYS II. A method is presented whereby variations of the material properties which might be expected to occur in the field can be determined from the results of the laboratory tests. Several examples of computer output are given as well as those significant limitations which should be imposed on its use.
fatigue tests, material characterization, viscoelasticity, structural subsystems, computer programs
Highway research engineer, Federal Highway Administration, Washington, D.C.