為了研究火害後耐火鋼與普通鋼梁柱接頭銲接區於反覆載重作用下的力學行為，本論文採用普通等級結構用鋼材SN490B與耐火等級結構用鋼材SN490C-FR製作三種不同鋼材配置的梁柱銲接接頭十字試體（即：全耐火鋼梁柱銲接接頭十字試體、部分耐火鋼梁柱銲接接頭十字試體、全普通鋼梁柱銲接接頭十字試體），每種試體再區分為五組，分別施予五種不同的溫度處理（即：未受火害、升溫至800°C持溫1小時後空氣冷卻、升溫至900°C持溫1小時後空氣冷卻、升溫至800°C持溫1小時後水中冷卻、升溫至900°C持溫1小時後水中冷卻）來模擬鋼構建築之梁柱接頭受到火害高溫前後，其銲材與母材可能造成的材質變化，此15組梁柱銲接接頭十字試體先進行硬度試驗，瞭解火害前後三種不同材質配置之十字試體於梁柱接頭銲接區的硬度變化，再進行十字試體的反覆載重實驗與其後續拉力實驗，藉以探討火害前後三種不同材質配置之梁柱銲接接頭十字試體的巨觀機械性質與破壞模式。本研究發現：未受火害與火害後經空氣冷卻的十字試體均斷裂於母材區，十字試體經過空氣冷卻後相當於正常化處理，使得母材與銲道皆軟化，然銲道強度仍大於母材，故斷裂破壞發生於母材區；水中冷卻的十字試體皆斷裂於銲道或銲道附近的熱影響區，十字試體受到高溫淬火後，試體內部沃斯田鐵轉變為麻田散鐵，麻田散鐵組織生成越多，其強度越高，麻田散鐵組織生成之多寡與碳含量有關，由於母材含碳量較銲道為高，因此母材強度較銲道高，故斷裂破壞發生在銲道或銲道附近的熱影響區。

In order to study the post-fire mechanical behaviors of fire-resistant steel and normal structural steel beam-to-column welded joints under cyclic loadings, this thesis made three different types of beam-to-column welded joint specimens by the three different combinations of SN490C-FR fire-resistant steel and SN490B normal structural steel, which were fire-resistant steel specimens, partial fire-resistant steel specimens and normal steel specimens. Each type of specimens were divided to five groups and the five groups experienced five different temperature treatments, which were room-temperature treating, air-cooling after reaching 800ºC for one hour, water-cooling after reaching 800ºC for one hour, air-cooling after reaching 900ºC for one hour, and water-cooling after reaching 900ºC for one hour, respectively to simulate the possible material property variations of weld metal and base metal in the beam-to-column welded connections of steel buildings after fire. As a result, the fifteen beam-to-column welded joint specimens conducted the hardness test first to understand the hardness variations of the pre-fire and post-fire beam-to-column welded joints in the three different types of specimens. After the hardness test, the same fifteen specimens proceeded the cyclic loading test and the followed tensile test to investigate macro mechanical properties and failure modes of the pre-fire and post-fire beam-to-column welded joints in the three different types of specimens. This research found that the specimens with room temperature treating and the specimens with air-cooling after reaching the high temperature above 800ºC for one hour all fractured at the base metal. The air-cooled specimens were equivalent to the specimens with normalizing treating, which softened the base metal and the weld metal. However, the tensile strength of weld metal was still higher than that of base metal. As a result, the fracturing occurred at the base metal. The specimens with water-cooling after reaching the high temperature above 800ºC for one hour all fractured at the weld metal or the HAZ. The water-cooled specimens were equivalent to the specimens with quenching treating. The quenching treating made the austenite in the specimens transform to martensite. The more the martensite in the specimen, the higher the tensile strength of the specimen. The martensite content in a specimen was related to the carbon content of steel. Since the carbon content of base metal was higher than that of weld metal, the strength of base metal was higher than that of weld metal. As a result, the water-cooled specimens in this study fractured at the weld metal or the HAZ.

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