The purpose of this paper is to propose the hysteretic model of laterally unsupported H-shaped steel beams under cyclic loading at one end. We have figured out the lateral buckling behavior, including large deformation region, of the beams under cyclic loading through experiments. The hysteretic model is determined by the lateral deformation, unloading stiffness and cumulative plastic deformation of the experimental data. The validity of the proposed model is examined by comparison with the experimental data.The applicable range of width-thickness ratio of the model is determined by means of numerical simulation using FEM analysis.
