鋼筋混凝土為現今房屋結構材料之主體，而耐火性能為建築物結構設計的重要指標之一。本研究旨在探討鋼筋混凝土梁柱複合構件在高溫中、後之強度衰減情形與變形特性，同時利用ANSYS軟體分析試體內部溫度變化。本研究共測試2座實尺寸之梁柱複合構件試體，本文主要針對普通混凝土試體BNC1及自充填混凝土試體BSC1的梁進行研究，並與前期研究試體之成果相對照。
　　在高溫中，因梁試體受熱膨漲，使得梁末端反力減少，因此，梁柱接頭點至第一個加載點(距柱1.75 m處)間的剪力會增加，負彎矩區之彎矩在高溫中也會增加，而正彎矩區的彎矩則相對減少。梁試體在升溫過程中，正彎矩區之彎矩強度折減情形大於負彎矩區，此因梁底部混凝土及張力鋼筋所提供的強度受到高溫有明顯折減之故。
　　在殘餘強度測試中，試體之梁加載至服務載重的1.9-2.3倍時，梁之撓度開始出現明顯增加，最後均於第二個加載點(距柱4.35 m)發生發生版頂部混凝土壓碎之撓曲破壞，本研究所預測BNC1與 BSC1試體之極限載重與實測值之比值分別為0.76與0.78。

Reinforced concrete is the primary construction material of buildings nowadays, and fire resistance is one of the critical factors considered in design of buildings. This thesis aims at studying the behavior of beam-column sub-assemblage during preheating, heating and residual strength stages. Meanwhile, the ANSYS software is used to predict the temperature distribution of specimens. In experimental study, two full-scale beam-column sub-assemblage specimens were tested (BNC1 and BSC1). This thesis is focused on the study of beam in ordinary concrete specimens, BNC1, and self-compacting concrete specimens, BSC1.
In the heating phase, the thermal expansion of beam reduced the reaction at support, which led to the increase of shear force within the 1st loading point (at 1.75 m from the column) and joint and then increase of negative moment at joint, and decrease of positive moment at the 2nd loading point (at 4.35 m from the column). The decrease of positive moment is greater than that of negative moment, because more reduction in the strength of concrete and reinforcement occurred at the bottom of beam in the heating stage.
In the residual strength test, the deflection of beam in both specimens became pronounced as the total beam load reached 1.9-2.3 times of service load. Both specimens failed in typical ductile flexural mode by the crushing of concrete at top slab of second load point. The ratio of predicted to measur failure load of the two specimens are 0.76 and 0.78, respectively.

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