FIRE RESISTANCE OF CONCRETE-FILLED STEEL TUBULAR LONG COLUMNS WITHOUT FIRE PROTECTION

Abstract

Fire resistance test with loading was carried out to get the load carrying capacity of concrete-filled steel tubular long columns without fire protection in fire. The ratio of diameter to length of CFT columns is 12.0. The survey for the demand of CFT long columns in tall building was made. Before fire resistance test of specimen, loading method in tests, and analyses of CFT columns-Steel beam frame in fire were conducted to design specimen. As the results, the regression curves offire resistant time to axial load for circular and rectangular long CFT columns in ISO fire for fire resistant design can be obtained, respectively.