Fall 2002
Dynamic Analysis of Concrete Pavements
Syed Oliur Rahman
Based on a Finite
Element formulation of thick plate on elastic foundation, parametric studies are
performed in this work to investigate some important details of the dynamic
behavior of concrete pavements. Since the 2-parameter soil provides a rational
and computationally efficient model of the sub-soil, it is used in this work as
the sub-grade soil model and the differences from the response of Winkler
foundation is investigated. The parametric studies further include the
difference between static and dynamic response and also investigate the effects
of structural damping, vehicular speed and soil stiffness on the response of
concrete pavements to single wheel as well as HS20 loading. The wheels are moved
over the edge and centerline of the pavement and the resulting deflections and
principal tensile stresses are calculated from a dynamic time domain analysis. Results from the numerical analyses indicate that the
Winkler soil model may overestimate the structural responses and significantly
overdesign the pavement as a result. The effects of soil stiffness and
structural damping are found to be significant, as is the importance of dynamic
analysis. However, the effect of vehicular speed is found to be relatively less
significant in this study. |