) ( AIJ ) AIJ AIJ 1) ( ) AIJ RELATIONSHIPS BETWEEN FIRE PROOFING MATERIAL VOLUME AND SEISMIC STRUCTURAL RESISTANT MARGINS FOR A STEEL BUILDINGS Optimization for required fire proofing material volume using genetic algorithm Fuminobu OZAKI and Kenzo HAMAGUCHI In case when fire resistance of a steel frame is verified in seismic regions, it is important to understand effect of seismic design on fire resistant design, to improve both seismic and fire resistant performance. The main purpose of this

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... aper is to clarify relationships between an input amount of fire proofing material and a seismic structural resistant margin, which is given by a quotient of horizontal load-bearing capacity divided by required horizontal load-bearing capacity of the steel frame. To estimate minimum value of the required fire proofing material volume, genetic algorithm (GA) analyses are conducted. From minute investigation of the parametric numerical results, it was clarified that the fire proofing material volume can be reduced in the case of steel frame with the large seismic structural resistant margin, because the redundant seismic frames have the high collapse temperatures and large thermal capacity of the large cross-sectional area members. Keywords fire resistant design for steel structure, fire proofing material, seismic structural resistant margin, genetic algorithm, optimization 1 ( ) Associate Professor, Grad. S. Environmental Studies, Nagoya Univ., Dr.Eng. 2 ( ) Former Dept. Civil Engineering and Architecture, Nagoya Univ., B.Eng. ─ 1811 ─