Abstract
Inelastic behaviors of steel column segments under cyclic biaxial bendings and constant axial force are studied by the experiments and the numerical analyses. The loads considered are an axial force and two bending moments about the principal axes and the corresponding deformations are an axial strain at the centroid of the section and two bending curvatures about the principal axes. The numerical analysis is done by the step-iteration method using a tangent stiffness given by W. F. Chen and T. Atsuta. In the analysis, nonlinear and non-stationary hysteretic stress-strain relations of fibers are predicted by the author's method using the monotonic stress-strain curve of the material and the previously reported empirical equations for mild steels. The experiments for various loading paths are performed and the resultant moment-curvature relations are compared with the results of corresponding numerical analyses to show good agreement.
