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

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. A C.F.T. column specimen using rectangular steel tube and three C.F.T. column specimens using circular steel tubes were heated under constant axial load and lateral force to simulate the elongation. The tests results are summarized as follows: 1) The fire resistance was 2.5 hours for a rectangular specimen and 3.5 hours for a circular specimen, when the axial load ratio was equal to 0.4 and maximum displacement angle was equal to 1/50. 2) After 30 minute heating, all specimens could not resist the bending moment due to the elongation of beams, however the specimens could sustain the axial load. 3) After 2 or 3 hours heating tests for circular specimens when the axial load ratio was equal to 0.3 or 0.2, the residual flexural stiffness and bending capacity were two-thirds of their original ones respectively.
一般社団法人日本建築学会の論文
2000-03-20