目前鋼筋混凝土仍為建築材料之主體，由於火災是建築物損害的一大因素，因此鋼筋混凝土結構物受火害的相關研究相當的重要。本研究之目的在探討外柱接頭於高溫中、後之溫度變化及變形。
本研究使用普通混凝土(NC)及自充填混凝土(SCC)兩種材料，各製作三支試體，分別命名為NC4、NC5及NC6與SCC4、SCC5及SCC6，本論文是針對NC5、SCC4與SCC5試體的外柱接頭行為進行探討，並利用ANSYS套裝軟體建立電腦模型，以與實驗值相互印證。主要研究成果如下：
1.依高溫測試結果，NC5與SCC5試體的外柱接頭內部上下斷面中心處溫差不大，顯示接頭內部的上下熱傳遞情形不明顯。在接頭背部以及靠近邊梁和長梁處的溫度與接頭中心的溫度差距不大。ANSYS模擬的溫度分佈與實驗值接近，證明本文採用的熱學參數應屬合理。
2.試體受熱60分鐘內，外柱接頭轉動角大致上為先順時針再逆時針轉動，至關火期間內，接頭順時針轉動。試驗開始400分鐘時，接頭開始微幅的震盪直至不再變化，最終皆停在順時針方向。
3.殘餘強度測試中，NC5試體及SCC4試體的外柱接頭受梁載重的影響下，轉動方向皆為順時針方向且有相似的變化趨勢。

The reinforced concrete is currently the main body of the constructional materials, and the fire is a major factor which causes building damaged. Therefore, the research of the reinforced concrete structures under fire is an important issue. The objective of this research is to study the behavior of exterior joint under elevated temperature test.

We used two kinds of materials for the six specimens, ordinary concrete (NC)and self-compacting concrete (SCC), namely specimen NC4, NC5, NC6, SCC4, SCC5, and SCC6, respectively. Specimens NC5, SCC5, and SCC4 were tested in this study. The ANSYS software was used to model the specimen.

Main research results are as follows：

1.During the heating stage, the center temperature of exterior joint was very close to those at top and bottom of joint, which demonstrated that the internal heat transfer is not significant. The temperature of concrete near the back part of joint, the longitudinal beam, and spandrel beam was close to that at the center of joint. The temperature predicted using ANSYS software closely related to the measured data.
2.During the first 60 minutes in the heating period, the exterior joint was in clockwise and then followed by anti-clockwise rotation. Following the turned-off of fire, the rotation of joint was in clockwise direction. Some residual clockwise rotation was observed at the end of test.
3.In the residual strength test, the rotation of exterior joints’ in NC5 and SCC4 specimens were clockwise due to beam load. The variation of the rotation of both specimens was similar.

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