Abstract
The present paper is concerned with an elasto-plastic large displacement analysis of cantilever type of steel pipe-section columns modeling the bridge piers under cyclic loading. A modified two-surface plasticity model recently developed in Nagoya University is employed for material nonlinearity. Comparisons between the analytical and experimental results show that the modified two-surface model can be used to predict the inelastic cyclic behavior of steel structures with good accuracy. A parametric study is then performed to investigate the effects of radius-thickness ratio, slenderness ratio, magnitude of axial load and cycle numbers on the ultimate strength and ductility of the columns. Finally some formulas on load carrying capacity and ductility are presented considering the effects of various parameters.
