Computer analysis of arbitrary reinforced concrete cross-section under bieccentric load

The computational aspects of the problem of ultimate strength analysis of a rbitrary reinforced concrete cross-sections under normal force and biaxial bending are considered. The cross-section secant stiffness derived here ins ures the convergence of the solution for the equilibrium equations in any l oad case. The stress-strain relations of concrete and reinforcements are ex pressed in terms of the piece-wise continuous cubic polynomials. The coeffi cients of the cross-section equilibrium equations me evaluated numerically by applying the integration rules proposed by Rieckmann and Sommerfield. Th e present approach is demonstrated through several examples.