An analytical model able to evaluate the bondslip\nlaw of confined reinforced concrete elements is developed\nand presented in this paper. The model is based on the\nstudies developed by Tepfers and by den Uijl and Bigaj on\nthe thick-walled cylinder model and extended to the case of\nthe presence of transverse reinforcement. The bond strength\nand the considered failure modes (splitting or pull-out failure)\nare expressed as a function of the geometrical (concrete\ncover and transverse reinforcement) and mechanical (concrete\nstrength) parameters of the element. The application of\nthe proposed methodology allows to forecast the failure\nmode, and equations for the bond-slip law are finally proposed\nfor a range of steel strain lower than the yielding one.
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