Dynamic analysis of rigid pavements considering pavement-subgrade-aircraft interaction

An algorithm based on the finite element method is developed to analyze the dynamic response of multiple, jointed concrete pavements to moving aircraft loads. The algorithm accounts for the dynamic pavement-subgrade-aircraft interaction effects. A special joint element is developed to accurately model the dowel pavement joints, based on the contact theory. In the finite element idealization, the concrete pavement is modeled by thick or thin plate finite elements. The subgrade is idealized by the Winkler spring-dashpot system or by the two parameter foundation model. The dowel bars at the transverse joints are represented by beam, grid or plane frame elements. The dowel-pavement interaction effects are accounted for by employing contact elements between the pavement and the dowel bar. Keyed joint or aggregate interlock joint is assumed for the longitudinal joint and represented by a series of vertical spring elements.;The dynamic aircraft-pavement interaction effects are considered in the analysis by modeling the aircraft by masses supported by spring-dashpot systems representing the landing gear of the aircraft. It is assumed that the aircraft travels along a straight line with a specific initial velocity and acceleration.;The accuracy of the computer code is verified by the available experimental and analytical solutions. A parametric study is conducted to investigate the effects of various parameters on the dynamic response of pavements.