FIRE RESISTANCE OF FIRE-RESISTANT STEEL COLUMNS

This paper is to verify the fire resistance of columns made from fire- resistant (FR) structural steel by means of a full-scale loaded heat t est and numerical analysis. Because of the elements contained, FR stee l has higher strength than conventional structural steel at elevated t emperatures. Its 0.2% proof stress at 600-degrees-C is equal to or gre ater than two-thirds the value specified at room temperature. Rock woo l, ceramic fire protection, and foaming-type intumescent coating were used as fire-protection materials. Using Japanese codes. the high-temp erature strength of steel can be exhibited with building members, the fire-protection thickness can be reduced below what is required for co nventional steel columns, and 1-h fire resistance can be obtained by i ntumescent coating with a lower insulation property. Also, deformation and fire-resistance time can be simulated from the mechanical propert ies at elevated temperatures and elastoplastic thermal deformation ana lysis. Furthermore, this study is based on Japanese codes, and results will differ if based on ASTM codes.