| 摘要 |
PROBLEM TO BE SOLVED: To provide fireproofing-protection-free steel-frame members, such as column materials, beam materials, connection brackets and damage- concentrated members, which can be used for a steel-frame structure subjected to fires and by which 30 min fireproofing-protection-free structure or 60 min fireproofing-protection-free structure can be attained at >700 to 850 deg.C. SOLUTION: The fireproofing-protection-free steel-frame member are those for use in a steel-frame structure subjected to fires and are composed of fire- resisting steel material having >=94 MPa yield strength at >700 to 850 deg.C; the coefficient of sectional form, HP/A(m<-1> ), is made to <=150 and 30 min fireproofing-protection-free structure can be attained. In the case of steel-frame members having 60 min fireproofing-protection-free structure, the coefficient of sectional form, Hp/A(m<-1> ), is made to <=60.
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