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強制変形を受ける場合について

概要

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The thermal elongation of steel beams should be taken into account for fire-resistant design of concrete-filled steel tube (C.F.T.) columns in case of fire. Five C.F.T. column specimens using rectangular steel tubes and four C.F.T. column specimens using circular steel tubes were heated under constant axial load and deformation to simulate the elongation. The tests results are summarized as follows: 1) The fire resistance was 2 hours for rectangular specimens and 1 hour for circular specimens, when the axial load ratio was equal to 0.45 and the displacement angle was equal to 1/100. 2) All C.F.T. columns were axially elongated most at early stage, and then shrinked gradually to failure. 3) After 30 minute heating, the C.F.T. columns could not resist the bending moment due to the elongation of beams, however the columns could sustain the axial load.
社団法人日本建築学会の論文
1994-04-30