目前國內外對於鋼筋混凝土的梁構件或柱構件耐火有相當完善的研究報告，但是很少有針對鋼筋混凝土的梁柱複合構件耐火研究。本研究之目的在於探討常溫與高溫後的承力行為和破壞強度之折減關係。
本研究先測試常溫下的鋼筋混凝土梁柱複合構件試體，主要探討常溫下的梁試體之力學行為和強度情況。後續再針對於高溫中和高溫後的鋼筋混凝土梁柱複合構件，探討梁試體在高溫中隨時間之變化與梁變形之行為關係，以及高溫後梁試體的承力行為折減。並且使用ANSYS套裝軟體模擬混凝土的斷面遭受實際試體的升溫曲線，模擬梁的斷面溫度分佈與實驗的梁斷面溫度分佈做比較。
利用ANSYS套裝軟體的分析得到之溫度分佈與實驗量測值相差不遠，所以ANSYS套裝軟體模擬的溫度分佈還是有參考價值。由本研究探討常溫下的彎矩與高溫後加載行為的殘餘彎矩做比較，高溫後正彎矩撓曲強度的衰減非常小，但是對於負彎矩而言，撓曲強度就衰減非常的大。

Complete and thorough reports on fire-resistance of reinforced concrete beams or columns have been available worldwide. Only a few investigations focused on the fire-resistance of reinforced concrete beam-column sub-assemblage are presented. Therefore, the aim of this investigation is to discuss the mechanisms and strength decays of the beams under room and elevated-temperature.
First, the reinforced concrete beam-column sub-assemblages were tested in the room-temperature to investigate the behavior and variations of the strength. Then, a separate identical specimen was tested in the elevated-temperature and post fire condition to investigate the relationships between the behavior, deformations, strength decay and variations of time. In addition, we used the software “ANASYS” to predict the temperature distribution in the cross sections of beam and compare it with the test results.
According to the analytical results from “ANSYS” program, we find that the temperature distribution in the beam cross section is quite close to the test results. In addition, according to the comparisons of the residual moment strength of beam after the elevated-temperature and under room-temperature, the decay of the positive-moment strength is less pronounced than the negative-moment strength.

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