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Uesugi, H., Seki, M., Niwa, H. and Saito, H., 1997. Numerical Analysis Of Load Bearing Capacity Of Concrete-filled Steel Tubular Columns Exposed To The Standard Fire. Fire Safety Science 5: 1069-1080. doi:10.3801/IAFSS.FSS.5-1069
Fire resistance of concrete-filled steel tubular columns is greater than that of unfilled members. But it is required to apply spray fire protection to the same thickness as for non composite steel structures under the present regulations in Japan. It has been tried to make clear the fire resistance of concrete-filled steel tubular columns under pure compression but the columns must suffer the large bending deflection according to thermal elongation of beams exposed to fire. In this study it is tried to analyze the loss of load bearing capacity about concrete filled steel tubular columns under bending deformation and axial force in fire. It is cleared that the loss of the load bearing capacity is due to concrete cracking at inner part of column section induced by thermal expansion at mounting part of column section.