Evaluation of Bond Performance of Epoxy-Coated Reinforcing Steel Using Nonlinear Finite Element Analysisby David Darwin, Univ of Kansas, United States,
Steven L. McCabe, Univ of Kansas, United States,
Oan Chul Choi, Univ of Kansas, United States,
Abstract: The role played by epoxy coatings on the failure of standard beam-end specimens is explored. The specimen consists of a reinforcing bar embedded in concrete. As the bar is loaded, the specimen is placed in flexure, resulting in simultaneous tension in both the reinforcing steel and the concrete. The specimen is designed to duplicate the stress field that occurs in beams. Experimental results show that bond strength increases with additional cover and embedment length, but that bond strength per unit length decreases as embedment length increases. The results also show that epoxy coatings reduce bond strength, but that the effect is dependent on the bar size and the deformation pattern. The finite element model for the beam-end specimen includes representations for the deformed steel bar, the concrete, and the interfacial material. The interface is represented by special link elements that can be varied to match the stiffness and friction properties of the interfacial material. Cracking within the concrete is represented using A. Hillerborg's fictitious crack model. The goal of the model is to incorporate the key aspects of material behavior in as simple a representation as possible while duplicating the principal behavior of the test specimen.
Subject Headings: Reinforced concrete | Bars (structure) | Material properties | Bonding | Finite element method | Epoxy | Nonlinear finite element analysis
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