EVALUATION OF NON-UNIFORM TYRE CONTACT STRESSES ON THIN ASPHALT PAVEMENTS

The paper illustrates the importance of load/stress inputs in pavement design on pavements with relatively thin asphalt surfacings, typically used in southern Africa. The investigation concentrates on the quantification of several pavement response parameters as a result of non-uniform and non-circular shaped contact stresses at different asphalt moduli, compared to the traditional circular uniformly loaded tire patch. The finite element method (FEM) was used for the detailed analyses. The responses of an un-cracked and cracked pavement structure were also compared, under circular and rectangular loading shapes of varying levels of loads and contact stresses using a customized semi-analytical FEM code. The response data were benchmarked with multilayered linear elastic theory, and also indicated the importance of both load shape and level of contact stress on pavement performance. The paper highlights the importance of using and managing actual tire-pavement contact stress data for more rational design and analysis of pavements incorporating thin asphalt layers.

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