本文依實際結構尺寸，使用ABAQUS分析軟體，進行有限元素數值模擬，探討鋼結構彎矩梁柱接頭在高溫環境中的行為；在高溫環境下鋼材材料之組成律，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，透過內政部建築研究所（ABRI）的H型梁-箱型柱彎矩接頭高溫試驗，擷取實驗溫度歷時資料，透過熱傳數值模擬試體表面溫度的分布差異，並接續熱傳數值模擬資料，進行結構數值模擬，以了解彎矩梁柱接頭在高溫環境下之行為，進行驗證本文數值模式之可行性，並考量側撐勁度的作用，藉此分析來探討不同受熱面下結構構件的火害行為。
論文架構主要敘述鋼材的高溫材料行為、實尺寸結構實驗、數值分析與驗證，以及火場受熱面結構行為分析，依照數值分析結果與實驗數據比較，來探討彎矩梁柱接頭在高溫環境下的行為，並模擬實際環境下的不同受熱面結構型式（邊柱與角柱）的火害行為，預測在高溫環境下接頭結構的防火時效，作為日後評估結構安全的依據。

This thesis presents the results of investigating the structural behavior of steel beam-column moment connections in fire. The finite element software ABAQUS has been used to analyze the three full-scale tests of H-beam to box-column moment connections carried out in ABRI. Two kinds of materials, SN490B and SN490C-FR, have been considered. The material properties of steel at high temperature are adopted from material test and relevant documents in this study. The comparison between the measured results of the beam end displacement and the joint rotation and numerical results shows that they agree well with each other. The proposed model is verified to capable of predicting the steel structural behaviors in fire. The structural behaviors with different exposure surfaces which can be used to assess the structural safety in fire also have been analyzed.

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