Abstract
Thin-walled steel columns composed of stiffened plate elements are often used in Japan as piers for elevated highway bridges in urban areas, because of their small cross-sectional areas and high earthquake resistance. An accurate finite-element-method-based (FEM-based) analysis to predict the ultimate hysteretic behavior of thin-walled steel columns subjected to seismic loading is presented in this paper. For this purpose, a three-surface cyclic metal plasticity model is developed. The three-surface model includes less material parameters and internal variables for the ease of its implementation in the FEM analysis. This model is characterized by a discontinuous surface inserted between the yield surface and the bounding surface. The discontinuous surface is used to express the yield plateau and the change of hardening coefficient. Most material parameters in the three-surface model can be determined by the tensile coupon test. However, three parameters independent of material types are calibrated by the existing cyclic loading test results of thin-walled steel columns. This is to improve the accuracy of this analysis specifically in the simulation of the localized buckling behavior, which accompanies extremely large plastic strains.
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