Analysis of slab-on-grade pavement systems subjected to wheel and temperature loadings
Korovesis, George Theofanis
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Permalink
https://hdl.handle.net/2142/20751
Description
Title
Analysis of slab-on-grade pavement systems subjected to wheel and temperature loadings
Author(s)
Korovesis, George Theofanis
Issue Date
1990
Doctoral Committee Chair(s)
Barenberg, Ernest J.
Ioannides, Anastasios M.
Department of Study
Civil and Environmental Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Transportation
Language
eng
Abstract
This study is focused on the analysis of slab-on-grade pavement systems. Temperature and wheel loadings are considered. Aggregate interlock and dowel bars may be taken into account as load transfer devices at the joints or cracks.
In the first part of this thesis, previous analytical attempts to analyze slabs-on-grade with a temperature distribution through the thickness are examined. A short review of the theory of thermal stresses is also presented. It is recognized that although the temperature distribution through the thickness of the slab is highly nonlinear, neither an analytical nor a numerical procedure to estimate stresses and deflections due to such a loading combined with wheel loads exists. Using the finite element method a nodal load vector, work equivalent to a linear temperature distribution through the thickness, may be developed. For nonlinear distributions, separating the slab into two or more fully bonded layers facilitates the use of a piecewise linear interpolation scheme to accurately represent the temperature distribution.
Using the previously described scheme, program ILLI-SLAB was expanded to facilitate the analysis with linear temperature distributions and program ILLI-LAYER was developed to be used in the analysis with nonlinear distributions. The Kirchhoff and Mindlin plate theories are used in the formulation of the finite element for ILLI-SLAB and ILLI-LAYER respectively.
In the second part of this thesis the problem of multiple-slab systems is examined using ILLI-SLAB data and the principles of dimensional analysis. The independent engineering variables for the problem are identified. A method for the backcalculation of joint stiffnesses, and especially parameters like the spring stiffness for aggregate interlock and the dowel concrete interaction from Nondestructive Testing (NDT) data, is suggested.
For the case of multiple-slabs with linear temperature distributions through the thickness and wheel loads, the effect of pure-shear (aggregate interlock) as well as shear and bending (dowel bars) load transfer devices was examined. Both aggregate interlock and dowel bars may transfer a significant part of the wheel loading without increasing the slab restraint in curling.
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