Application of LS-DYNA in Identifying Critical Stresses Around Dowel Bars
A detailed 3D Finite Element (3DFE) Model is developed to examine the triaxial state of contact stress that develops around the dowel bars due to both traffic and thermal loads. Dowel bars are modeled using 8-node solid brick elements. Sliding interfaces with friction that permit separation are modeled along the full cylindrical surface between each dowel and the surrounding concrete. The model results are validated through comparison with laboratory measured strains in dowel jointed concrete specimens. The model results reveal that under the standard axle load, tensile stresses of magnitude sufficient to initiate localized concrete failure may develop in the concrete surrounding the loaded dowel. Such stresses are responsible for initiating cracks in the concrete that lead to the rapid joint deterioration.
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Application of LS-DYNA in Identifying Critical Stresses Around Dowel Bars
A detailed 3D Finite Element (3DFE) Model is developed to examine the triaxial state of contact stress that develops around the dowel bars due to both traffic and thermal loads. Dowel bars are modeled using 8-node solid brick elements. Sliding interfaces with friction that permit separation are modeled along the full cylindrical surface between each dowel and the surrounding concrete. The model results are validated through comparison with laboratory measured strains in dowel jointed concrete specimens. The model results reveal that under the standard axle load, tensile stresses of magnitude sufficient to initiate localized concrete failure may develop in the concrete surrounding the loaded dowel. Such stresses are responsible for initiating cracks in the concrete that lead to the rapid joint deterioration.
06-5.pdf
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