This paper proposes an analysis procedure able to determine the flexural response of rectangular symmetrically reinforced\r\nconcrete sections subjected to axial load and uniaxial bending.With respect to the usual numerical approaches, based on the fibre\r\ndecompositionmethod, this procedure is based on the use of analytical expressions of the contributions to the equilibriumgiven by\r\nthe longitudinal reinforcement and the concrete region in compression, which depend on the neutral axis depth and the curvature\r\nat each analysis step. The formulation is developed in dimensionless terms, after a preliminary definition of the geometrical and\r\nmechanical parameters involved, so that the results are valid for classes of RC sections.The constitutive laws of the materials include\r\nconfinement effect on the concrete and postyielding behaviour of the steel reinforcement, which can be assumed to be softening\r\nbehaviour for buckled reinforcing bars. The strength and curvature domains at the first yielding of the reinforcement in tension\r\nand at the ultimate state are derived in the form of analytical curves depending on the compression level; therefore, the role of a\r\nsingle parameter on the shape of these curves can easily be deduced. The procedure is validated by comparing some results with\r\nthose numerically obtained by other authors.
Loading....