抄録
This paper is intended to investigate the comparison of analytical results for RC columns subjected to bi-axial bending by means of different types of analyses, Fiber Model and Two-Dimensional Model. In Fiber Model, a cross section is discretized into a number of fiber segments. It is assumed that each segment is uniaxially stressed and stress of a segment can be obtained from the past strain history. Supposing that the section remains plane after deformation, the moment-curvature relation of a section would be calculated, assembling the stiffness matrix of each segment. Two-Dimensional Model is formulated, extending the degradingtype trilinear model, a kind of one-dimensional hysteretic rule, into two-dimensional one, by using Ziegler's hardening rule and Mises' flow rule in plasticity. Two similar models, original Two-Dimensional Model and modified one, discriminated according to the difference of stiffness evaluation in after-yielding range, are provided. In statical analysis, results by Fiber Model agree quite well with testing results. Those by modified Two-Dimensional Model are much more consistent with testing results than those by original Two-Dimensional Model. In dynamical analysis, response results by Fiber Model and modified Two-Dimensional Model have considerable similarity in the maximum displacements and also their waveforms.
