無耐火被覆小梁を有する鋼構造床架構の火災高温時崩壊挙動評価

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  • COLLAPSE BEHAVIOR EVALUATION OF STEEL FLOOR STRUCTURES WITH UNINSULATED SECONDARY BEAMS UNDER ELEVATED TEMPERATURES IN FIRES

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<p>The collapse behavior of steel floor structures under elevated temperatures in fires was investigated by detailed FEM analyses. The floor structure in the fire compartment is composed of uninsulated secondary-beams and steel-deck composite slabs, supported by insulated primary-beams, adjacent to unheated floor structures. Under the elevated temperatures, the secondary-beams and bolted simple connections lose strength and alternatively slabs carry the vertical load associated with large sagging deformation. The floor structure collapses when the reinforcement around the secondary-beam ends fails. The behavior and failure mechanism observed in the FEM analyses were confirmed by a simultaneous heating and two-directional loading experiment.</p>

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