地震後の梁端部破断による崩壊温度の低下 : 地震被害を受けた鋼架構の火災時安定性(その2)

概要

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For the purpose of making clear the effect of fracture at the end of the girder after earthquake upon ultimate temperature this paper has studied analytically the ultimate temperature of earthquake-resistant steel frame after earthquake. Assuming that steel frame consisting of 3 stories and 1 span undergoes fracture at the end of the girder by earthquake and it is subsequently subjected to fire at the first story refined finite element analyses as well as a simplified theoretical analysis have been conducted at earthquake and at fire. It is found that, in case that residual slope by relative story displacement does not exist their ultimate temperature is less decreased compared with those of frames without fracture at the end of the girder, but in case that residual slope by relative story displacement exists their ultimate temperature is decreased with increase in residual slope by relative story displacement or effective slenderness ratio compared with those of frames without fracture at the end of the girder.
2009-02-28