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Title: Structural analysis computer programs for rigid multicomponent pavement structures with discontinuities--WESLIQID and WESLAYER. Report 1, Program development and numerical presentations
Authors: Chou, Yu T.
Keywords: WESLAYER
Computer programs
Finite element method
Publisher: Geotechnical Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; GL-81-6 rept. 1.
Description: Technical Report
Abstract: This study was conducted to develop finite element computer programs to calculate stresses and deflections in rigid pavements with cracks and joints subjected to loads and temperature warping, as well as in the supporting subgrade soil. The Joints are connected by dowel bars or other load transfer devices. The slabs can have full or partial loss of subgrade support over designated regions of the slabs. Multiple-wheel loads can be handled and the number of wheels is not limited. Two programs were developed, one called WESLIQID and the other WESLAYER . The former is for pavements on liquid foundations and the latter is for linear layered elastic solids. Variable slab thicknesses and moduli of subgrade reaction are incorporated in the WESLIQID program, and any number of slabs arrayed in an arbitrary pattern can be handled. Because of larger computer storage requirement and computational complexity, the WESLAYER program is limited to two slabs. The theoretical background of the model is presented first, and the capability and logic of the programs are fully described. A discussion of the load transfer mechanism along the joints and cracks is then given. Results computed by the WESLIQID program were compared with those of available solutions, such as the Westergaard solution and Pickett and Ray's influence charts, and the comparisons were very favorable. The comparisons with the discrete-element computer program were excellent, except that the edge stresses computed by the discrete element program were much smaller. The WESLIQID and WESLAYER programs were used to analyze test pavements at eight U. S. Air Force bases and at the Ohio River Division Laboratories. The comparisons were centered on the percent stress transfer across the joint, and the comparisons were good. Based on the conclusions of the computed results, the design implication of WESLIQID in the rigid pavements is discussed.
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