Abstract
ABSTRACT The aim of this paper was to present the fracture criteria of the SRC columns based on the nonlinear analytical model. This study explored the flexural behavior of the SRC columns confined by the cross-shaped flange sections encased in the structural concrete which are subjected to the flexural loads and the axial loads with 40% of the axial loads relative to the nominal axial load capacity. The confinements of the concrete columns in the compression zone provided by both the transverse reinforcements and the cross-shaped wide steels were evaluated based on an analytical model under axial and lateral loads. The increased flexural strength of the SRC columns by the confined effects offered by steel cores was also calculated. The composite actions of the cross-shaped flange sections that interacted with concrete were found to increase the flexural strength from 20% to 55%, depending on the spacing of the hoop reinforcement of the columns, compared with when composite actions were not accounted. The flexural capacities were underestimated substantially as the axial loads increased when the confinement provided by steel section was not accounted.
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