本文利用有限元素程式ABAOUS模擬切削減弱式梁柱接頭於高溫環境下之情形，觀察切削減弱式梁柱接頭於高溫中之結構行為與破壞模式，並將分析結果與未切削試體之結果做比較，探討梁柱接頭之切削處理對於梁柱接頭在高溫環境下之行為影響。溫度場之給定則利用區塊溫度給定法以及FDS-ABAQUS非耦合分析法兩種方法，藉此比較兩種方法的差異及適用性，最後探討普通鋼以及耐火鋼對於切削減弱式梁柱接頭於高溫環境下之行為影響，研究耐火鋼對於切削接頭溫度抵抗能力之提升程度。結果顯示，切削減弱式梁柱接頭於高溫下之行為模式與未切削梁柱接頭類似，其破壞溫度及時間也差距甚小，顯示切削減弱式梁柱接頭並未因切削處理而導致於火害中強度不足而讓梁柱接頭迅速破壞；區塊溫度給定法以及FDS-ABAQUS非耦合分析法兩種溫度給定法模擬出的結果相近，最後，由分析的結果也可得知耐火鋼對於切削接頭的耐高溫能力有著一定程度的提升。

In this article, finite element program ABAOUS is used to simulate the situation of the connection of Reduced Beam Section under high temperature environment, and the structural behavior and destructive model of the connection of Reduced Beam Section under high temperature is observed. Meanwhile, the analytical result is compared with Full Scale specimen to investigate the influence of the cutting treatment of connection on the behavior of connection under high temperature environment. The assigning of temperature field uses Block Temperature Assigned Method and FDS-ABAQUS non-coupling analytical method, at this moment, the difference and applicability of two methods are also compared. Finally, the influence of normal steel and fire-resistant steel on the behavior of Reduced Beam Section connection under high temperature environment is investigated, that is, the level of enhancement of fire-resistant steel on the temperature resistant capability of cutting connection is studied. The result shows that the behavioral model of Reduced Beam Section connection under high temperature environment is similar to that of Full Scale one, that is, the destruction temperature and time has very small difference; meanwhile, Reduced Beam Section connection does not lead to fast destruction of the connection due to insufficient strength in the fire disaster caused by cutting treatment. The simulation results of Block Temperature Assigned Method and FDS-ABAQUS non-coupling analytical method are similar. Finally, from the analytical result, it can be seen that fire-resistant steel has certain degree of enhancement on the high temperature resistant capability of Reduced Beam Section connection.

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