DUCTILITY EVALUATION OF SRC COLUMNS PREDICTING THE LOCAL BUCKLING OF THE H-SHAPED STEEL

Abstract

In reversed cyclic loading tests, SRC columns with a large amount of H-shaped steel are known to have excellent ductility after the spalling of cover concrete and the buckling of longitudinal bars. However after the local buckling of H-shaped steel, SRC columns are brittle fractured caused by the cracks. A ductility evaluation of SRC columns focused on the local buckling of the H-shaped steel has been suggested, because the crack of H-shaped steel is caused after the local buckling. In this method, the ultimate strain of flange plate has been formulated considering the concrete fixing. Moreover, the ultimate displacement of SRC columns are calculated by integrating the curvature. After comparing with the results from FEM analysis and experimental tests, it has been confirmed that the same response can be obtained by using proposed method to calculate the ultimate displacement, the buckling length and plastic length of flange plate.