鉄筋を配した充填鋼管コンクリート柱の耐火性能に関する実験的研究 : 梁の伸び出しによる横力を受ける場合について

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This paper presents experimental results of fire-resistance tests of concrete-filled steel tube (CFT) columns with inner reinforcement. Seven CFT column specimens using rectangular steel tubes (300 by 300) and seven CFT column specimens using circular steel tubes (318.5 dia.), limited up to 1/50 drift angle at maximum, were heated under constant axial loads and lateral forces to simulate the elongation of steel beams exposed to fire. The test results are summarized as follows : the CFT columns with inner reinforcement showed high fire resistance as compared to ones without inner reinforcement; the rectangular steel tube specimens, with 2.28% of longitudinal reinforcement and 0.22% to 0.45% of lateral reinforcement, were of 2.5-hour or more fire resistance for 0.6 of the axial ratio, and 3.0-hour or more fire resistance for 0.5 ; the circular steel tube specimens, with 2.12% of longitudinal reinforcement and 0.42% of lateral reinforcement, were of 2.0-hour or more fire resistance for 0.7 of the axial ratio, and 3.0-hour or more fire resistance for 0.6, while the ones with 0.21% of lateral reinforcement were of 3.0-hour or more fire resistance for 0.6 of the axial ratio.
社団法人日本建築学会の論文
2001-11-30