DYNAMIC ANALYSIS OF CONSTRAINED RIGID PAVEMENT SUBJECTED TO MOVING LOAD

Abstract

In the present study velocity-induced displacement, stress, and stiffness response of rigid pavement subjected to moving mass is captured using a numerical program. The implicit integration scheme is used to carry out dynamic analysis of rigid pavement supported by granular fill confined by retaining walls. A comparative solution to the problem of velocity induced loading, displacement, stress, and stiffness response is obtained using numerical algorithms. The dynamic amplification factors are calculated as a function of velocity in the vertical as well as in the lateral direction. The maximum value of dynamic displacement observed in the vertical direction was 31% higher than that of the static displacement and 57% higher than that of static displacement in the lateral direction. The maximum dynamic magnification was observed to be 70% higher than that of the static load for the selected velocities considered in this study. Numerical damping was introduced while computing velocity induced magnifications. The dynamic displacement contour showed levitation effects for the higher range of velocities. The model is validated by performing mesh convergence tests and results are compared within the output obtained using numerically varied algorithms. The evaluation of numerical damping, load and displacement magnification, and dynamic stiffness of the pavement along with velocity induced stress variation subjected to moving mass set an important milestone in the dynamic analysis of rigid pavements supporting the transportation network.