本文以包含溫度效應之向量式有限元素法之理論為基礎，加入處理劇烈應變速率的材料模式，建立平面鋼結構於高溫或者常溫環境下，受到爆炸力作用的數值分析模式。本文所建立之分析模式，先透過與文獻中相關之數值範例結果比較，以確保分析模式之正確性及適用性。驗證結果顯示，本文所建立鋼結構在承受爆炸載重下的分析效果良好，可有效模擬鋼結構於爆炸力作用下的結構行為。
接下來，根據本文建立之數值分析模式，分別討論不同邊界條件梁、柱桿件單純於爆炸力作用下之影響，之後將其置於全均溫溫度場以模擬梁、柱桿件於爆炸後發火害或者在火災過程中受到爆炸力作用之結構行為。最後，將應用推廣至單跨門型鋼架，討論其在僅受火害、僅受爆炸以及爆炸與火害複合作用下之結構行為。本文亦將數值分析結果與現有規範進行比較，探討結構於爆炸力作用下，這些規範的適用性。

This study adopted the Vector Form Intrinsic Finite Element (VFIFE) method to investigate the nonlinear behavior of steel structures under combined effects of impact, explosion, and fire. Detailed requirements for modeling elasto-plastic materials subjected to elevated temperature and high-strain rates are presented. The numerical model is first verified by comparing the results with the published analytical results for steel structures. Verification examples show that the proposed model can effectively predict the nonlinear behavior of the steel structure under effect of explosion.
According to the proposed method, several numerical analyses are presented. At first the steel beam and column are model in different support conditions, then consider that the structures subject to only explosion loading or explosion loading followed by fire. The influence of blast loads on the fire resistance of one story, one span steel frame is finally studied. This paper also compares the analysis results with some current codes, to check these codes are suitable or not when the steel structures are subjected to blast loading and fire.

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