Abstract
Mild steel portal frame specimens are tested under the constant vertical and monotonic alternating horizontal loads, in order to clarify the influence of the local buckling on inelastic behavior of steel frames. The frame specimens are assembled by welding from H-shape columns and a rolled H-shape beam. As the experimental parameters, width-to-thickness ratio of the flange and web of column cross section and axial load of column. Twenty six specimens are tested. Load carring capacity and deformation capacity are investigated, and it is shown that experimental behavior of the locally buckling frames is well predicted by the analysis based on the plastic hinge method in which the decrease of the full plastic moment of the cross section due to the local buckling is taken into consideration.
