地震後の残留層間変形角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1)

概要

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Within three days immediately after earthquake fire often breaks out. When fire fighters cannot approach such a structure because of traffic congestion caused by earthquake, it is necessary to prevent somehow the structure from collapsing. Assuming that a steel building frame undergoes permanent relative horizontal story displacement due to an earthquake and it is subsequently subjected to fire, this paper has studied the ultimate temperature of the damaged structure. To this end, refined finite element analyses as well as a simplified theoretical analysis have been conducted. It is found that, although the damaged frames are apparently weakened in fire resistance due to earthquakes and their ultimate temperatures are more or less decreased compared with those of frames without damage, the reduction in ultimate temperature remains slight for the frames consisting of short columns (columns with slenderness ratio of 0.2 to 0.4) which are commonly used in seismic design in Japan.
2008-08-30