Compressive behavior of steel cruciform column subjected to thermal history assuming fire

Abstract

A series of experiments and numerical analyses were conducted for investigating the compressive behavior of steel cruciform columns subjected to thermal history assuming fire damage. The lower arts of the columns were locally heated up to 600 ℃ and 900 ℃ and rapidly cooled by water. After the heating experiments, the monotonic compressive loading experiments were performed. The elastic stiffness of the heated columns became lower than that of the sound column according to the magnitude of the out-of-plane deformation by the heating. The ultimate compressive strengths of the heated columns were almost the same as that of the sound column. The change in mechanical properties and residual stress by heating did not influence the compressive behavior of the heated columns.