本文依實際結構尺寸，使用ABAQUS軟體，進行有限元素數值模擬，探討鋼結構抗彎梁柱接頭在高溫環境中的行為；在高溫環境下材料之組成律，採用SN490B耐震B級鋼與SN490C-FR耐震C級耐火鋼等兩種鋼材之材料性質，熱傳性質採用Eurocode-3與相關文獻建議之參數，透過熱傳數值模擬了解爐溫與試體間溫度分佈差異，並接續熱傳數值模擬資料，進行結構數值模擬，以了解抗彎矩梁柱接頭在高溫環境下之行為，同時藉由國內I型柱I型梁高溫載重實驗、國外簡支梁高溫載重定載加溫實驗，進行驗證本文數值模式之可行性。
論文架構主要敘述鋼材的高溫材料行為、數值模擬分析、數值分析模式驗證、熱傳分析結果、定溫加載與定載加溫分析結果，分析主體採用SN490C-FR部份取代SN490B鋼材的箱型柱I型梁，撘配集中載重與均佈載重兩種載重形式，共6個Case，並依數值分析模式探討抗彎矩梁柱接頭在高溫環境下之行為，以了解SN490C-FR耐火鋼對抗彎矩梁柱接頭在高溫環境下所增加之效益與SN490C-FR使用上建議之改善措施。

This text presents the results of a numerical study,using ABAQUS, to investigate the structural behavior of steel beam-column moment connection in fire environment in which two materials,SN490B and SN490C-FR are consider. The material properties of steel in high temperature proposed by material test and relevant documents are used in this study. The feasibility of ABAQUS numerical simulation model have been proven by ABRI’s I column-I beam moment connection fire experiment and Rubert and Schaumann’s simplly supported beam fire experiment. The focus of this study is using the steel material of SN490C-FR to replace that of SN490B on the box-column I-beam. One can obtain the relation of the loading-displacement –temperature and moment-rotation-temperature of the tested specimens moreover comparison of the effect of the additional SN490C-FR by defined the utmost of the temperature and loading wase also preformed in this study.

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