高層建築物の火災時崩壊挙動に関する数値解析的検証

摘要

Fire-induced collapse behaviors of a high-rise building with an outrigger truss system were verified using the ASI-Gauss technique. The effects of fire patterns and structural parameters on the redundant strengths were surveyed by observing the collapse initiation time: the duration from the beginning of the fire until collapse initiation. From the numerical results, it is confirmed that collapse initiation times are significantly affected by the member joint strengths if the axial force ratio is small on the condition that the fire pattern is nearly symmetrical, and the load paths to and from the outrigger truss system are sufficiently protected.%高層建築物の火災を引き起こす要因や火災規模は様々であり，その際の建築物に残存する余剰強度について系統的に議論するのは極めて困難である。9．11事件でのニューヨーク世界貿易センター（WTC）ビルのように，飛行機が衝突した際にジェット燃料が拡散して大規模火災が発生し，それが主要因となって1時間～1時間半経で完全に倒壊してしまった事例が存在する。