Nonlinear Analysis of Cross Sections under Axial Load and Biaxial Bending

作者：Di Ludovico Marco^*; Lignola Gian Piero; Prota Andrea; Cosenza Edoardo

来源：ACI Structural Journal, 2010, 107(4): 390-399.

• biaxial bending
• cross section
• nonlinear
• moment-curvature
• three-dimensional interaction domain

The paper presents a method and an integration procedure specifically targeting the analysis of cross sections under biaxial bending and axial load, whatever the shape-including internal voids-and made of different materials (for example, concrete) internally or externally reinforced by mild steel, prestressing tendons, and fiber-reinforced polymers. Surface integration of meshed cross sections allows moment-curvature relationships to be computed using nonlinear constitutive relationships (also with softening) and three-dimensional (3D) interaction domains P-M-x-M-y to be drawn. Iteration procedures and convergence criteria are herein proposed to rapidly solve the highly nonlinear problem. Numerical tests showed fast convergence of the algorithm and good agreement with experimental results elsewhere; comparisons between the numerical outcomes and the simplified expressions available in the literature have been performed to point out the current limits of the available codes' formulas.

• 出版日期2010-8