本研究之目的在應用火災模擬軟體FDS以及有限元素分析軟體ABAQUS來研究火災時雙層鋼構建築之結構行為，並比較不同的起火源和使用耐火鋼或普通鋼對雙層鋼構建築所造成的影響。所有的鋼構建築案例皆使用輕質混凝土樓版，而梁柱系統則依分析案例之不同而使用耐火鋼SN490C-FR或普通鋼SN490B。本研究首先進行單跨雙層建築之火災模擬，並取得結構體表面的溫度歷時來進行建築結構的熱傳分析，再將熱傳分析結果導入進行順序耦合分析，得到火災時單跨雙層建築的結構行為，之後，再使用相同的分析方法，來模擬雙跨雙層建築在火災時的的結構行為。數值模擬結果顯示：由於所模擬建築案例的居室尺寸不大且火災延燒迅速，起火源的影響只在火災延燒階段，在一定時間以後，其對鋼構建築的結構行為影響不大；耐火鋼由於在高溫下能保持較高之強度與彈性模數，因此採用耐火鋼的建築其樓版的垂直向變形在火災時較小，但其梁軸力以及梁軸向變形均較普通鋼梁為大。火害中，雙跨建築樓版的垂直向變形較單跨建築為小，而雙跨建築的內梁容易累積熱能，故溫度較高，其梁軸力與軸向變形較外梁為高。

The purpose of this study is to investigate the fire-structure behaviors of two-story steel buildings using the fire simulation software FDS and the finite-element analysis software ABAQUS. The influences of different fire origins and using fire-resistant steel or normal steel in the two-story buildings were compared. In this study, all the steel building cases utilized light-weight concrete floors, but the beam and column system utilized normal steel SN490B or fire-resistant steel SN490C-FR depending on the different analysis cases. First, fire in the one-bay-two-story building case was simulated to obtain the surface temperature history of the building structure, which was substituted into the heat transfer analysis as the input. The output of this heat transfer analysis was then employed to perform sequentially coupled thermal-stress analysis and the structural behavior of the one-bay-two-story building case in fire was obtained. Using the same analysis procedure, the fire-structure behavior of the two-bay-two-story building case was obtained as well. The numerical simulation results show that, due to small room size and quick fire spread, fire origin only had influence at the fire-spreading phase and did not have much influence on the structural behaviors after a certain time. Fire-resistant steel could have higher strength and elastic modulus in high temperatures, so, in fire, the vertical deformations of floors in the building case using fire-resistant steel were smaller. However, the axial forces and axial deformations of fire-resistant steel beams were larger than those of normal steel beams. The vertical deformations of the two-bay building case were smaller than those of the one-bay building case. The axial forces and axial deformations of interior beams were larger than those of exterior beams due to more accumulated heat in the interior beams.

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