結構之穩定性為建築物於火災後安全評估的重要考量之一，柱構件破壞會危及整體結構，本研究主要目的為探討鋼筋混凝土柱在承受偏心與無偏心之不同載重之下，於升溫與冷卻階段之軸向變形行為。
本研究以長柱、梁柱接頭構件模擬火場中四面及三面受火之情形，建立升溫及冷卻階段之熱應變模型，根據模型所預測之軸向變形，與試驗之觀察現象和量測位移對照，探討預測方法與實際現象之差異。
模擬溫度與實測溫度的溫度差，以及試體的爆裂程度，會影響柱變形之預測結果，導致預測之位移量與實際值之間的差異。混凝土於高溫中會有不可逆之殘餘應變，分析時應考慮試體之溫度歷程與混凝土劣化的影響，以符合熱應變於冷卻中之實際現象。將偏心載重柱之變形預測視同為無偏心載重柱，再將偏心產生之彎矩作用疊加，所得之熱變形預測結果誤差甚小，能有效簡化運算。

The stability of the structure is one of the safety evaluation of buildings after fire. Destruction of columns would endanger overall structure. This study mainly aims to study the thermal deformation of axially and eccentrically loaded reinforced concrete columns subjected to different loads during heating and cooling stages.
In this study, we use single columns and beam-column sub-assemblages to simulate structure with three sides and four sides exposed to fire, also create heating and cooling strain model to analyze axial displacement.
The analysis of deformation would be affected by the disparity of temperatures between analysis and test, along with spalling of concrete. Cracks generated by deteriorating concrete during heating up lead to irreversible residual deformations. To correspond with this phenomenon, the analysis should consider the influence of residual strain in cooling phase. In order to simplify the analysis of thermal deformation of eccentrically loaded specimens, the effect of eccentric load is divided into axial load and moment, respectively. The results of prediction are well correlated to the tests.

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