This paper presents a computer method for moment-curvature analysis of arbitrary-shaped prestressed reinforced cross-sections that are subjected to biaxial bending and axial force. The method shows very good stability in presence of strain softening effect exhibited by the concrete in compression and tension and convergence stability is not affected by the shape of stress-strain relationships of concrete and the type and amount of reinforcements. The effect of the presstressing strain over inelastic behavior of cross-section has been also investigated. In order to illustrate the proposed method and its accuracy and efficiency, a computer program has been developed and used to study several representative examples, which have been studied previously by other researchers.

Keywords: Moment-curvature, Prestressed RC sections, Arc-length method, Biaxial bending.