The elastic-plastic behaviors of metal column segments under cyclic biaxial loading and constant axial force are studied by the experiments and numerical analysis. The loads considered are an axial force, two bending moments about the principal axes and a bimoment and the corresponding deformations are an axial strain at the centroid of the section, two bending curvatures about the principal axes and a warping curvature. 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, the nonlinear stress-strain behaviors of fibers, i. e. the strain hardening and Bauschinger effect, are considered. In part 1, the experimental and analytical methods are shown and the propriety of analytical method is examined by a few example, and after part 2, the behaviors of hollow circuler section and H-section are discussed.
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