鋼材在高溫環境下之材料性質對鋼結構火害分析相當重要，為了能有效預測鋼結構受火害之行為，本文以向量式有限元素法之基礎理論，加入熱效應以及潛變效應，建立平面鋼結構在高溫環境下之數值分析模式，透過文獻之相關數值範例，進行驗證，確認向量式有限元素法的適用性與正確性。
利用本文所建立之數值分析模式，進行鋼柱在高溫環境下之潛變挫屈研究。以不同之載重比、升溫速率、細長比以及束制條件作為參數研究。另外，分別進行含潛變與不含潛變之比較，來探討潛變效應在火災環境之重要性。

To predict the behavior of steel structure under fire effect, the material properties is very important in the analysis in steel structure in high temperature environment. This study adopted the Vector Form Intrinsic Finite Element (VFIFE) method to investigate the nonlinear behavior of steel structures under heating and creep effects conditions, and establish the numerical analysis model of flat steel in high temperature environment. According to the numerical examples of related reference, we first confirm the applicability and accuracy of VFIFE .
By using the modified VFIFE in previous mention, we study the creep Buckling of steel columns in high temperature environment with different load ratio, heating rate, slenderness ratio and boundary restraint condition as parameters of this study. Furthermore, we respectively compare the result with or without creep effect, to discuss the importance of creep
effect in fire.

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