This paper presents a nonlinear analysis of reinforced concrete structures. Various yield surfaces of concrete are reviewed in the beginning and then a recently proposed yield surface for concrete is introduced. The yield surface considers the behavior of concrete in a three-dimensional stress state. Based on the yield surface, a nonlinear nite element formulation is provided to facilitate a three-dimensional analysis of reinforced concrete structures. An eight-node brick element is used in the analysis. Several numerical examples are given to show the ability of the yield surface in solving nonlinear reinforced concrete problems.

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