填充型鋼管混凝土柱具高強度高韌性之優良特性，即使承受火害其核心混凝土不易喪失垂直承載力，故可降低其防火被覆需求，加上鋼管材料比較容易回收，具有環保優勢。填充型鋼管混凝土柱可分為組合箱型、矩形及圓形鋼管斷面，組合箱型柱及矩形鋼管推廣應用已行之有年，圓形鋼管混凝土柱則因其與H型鋼梁在梁柱接頭交會區施工不易，以及接頭區之剪力機制不明，使得應用上受到限制。
近年來隨著都市更新，都市建築有高層化趨勢，超高層建築基底樓層之柱必須承受較高的軸壓力，使用鋼管混凝土柱填充混凝土由於鋼管可提供混凝土極佳的圍束力以提升其強度及韌性，具有一定的優勢，故本研究設計一採用鋼板貫穿混凝土填充式鋼柱，該鋼板稱為翼板連接板，鋼梁翼板以銲接方式與翼板連接板接合，鋼梁腹板採螺栓與銲於鋼柱表面之腹板連接板接合。梁翼板端可採用任一種可使梁塑鉸離開柱面與銲接熱影響區之設計一簡單可行之接合型式。依據以上規劃設計4組接頭區剪力破壞之試體，分別以內灌混凝土、內藏加勁板與翼板連接板寬作為變異參數，以研究接頭剪力強度，藉此除了驗證接頭細部設計之可行性，並對內灌混凝土、加勁板與翼板寬之影響作進一步之研究。
實驗結果顯示本研究所研擬之接合方式安全、經濟便利可行，接頭內灌混凝土對於接頭之剪力強度有顯著之提昇，內藏加勁板與增加梁寬對於接頭剪力強度貢獻亦為顯著。實驗結果數據與規範比對發現，以現行SRC規範之條款計算此種接頭之剪力強度，結果保守安全，但於混凝土抗剪貢獻之部分有嚴重低估之情形，本研究就實驗觀察及數據之分析提出相關設計建議，以供後續研究或規範修改之參考。其中有對梁寬提出上下限之建議，以確保接頭灌漿施工性與梁剪力傳遞至接頭之有效性。並針對外柱之情形，提出翼板連接板貫入接頭端加銲加勁板之設計建議。

Concrete filled steel tubular (CFT) columns have advantages in strength and ductility. Even under fire attacks, the core concrete could maintain its axial load capacity and thus the strict requirement for fire proof may be liberated. Furthermore, recycling of steel tubes is relatively easy. Typical CFT columns are in the form of square tubes or circular pipes as required by architectural restrictions. Unlike the widely-used box-section columns, the use of circular CFT columns has been limited due to the complexity of the connections to such columns.
Recently, skylines in modern cities continue to rise because of urban renewal. The columns in the lower stories in a high-rise building have to sustain high axial load and bending moment. CFT columns have advantages over conventional l and RC columns because the steel tube serves as formwork and offers superior confinement to the infilled concrete, thus improving its strength and ductility under high axial load. However, the complex design and detailing for moment connections have to be further improved, simplified, and verified with experiments.
This research proposed a beam-flange-through-type beam-column joint connection for CFT columns and tested four beam-column joint specimens to examine the effect of infilled concrete, beam flange stiffeners, and width of beam on the joint shear strength. Construction of the specimens showed that the proposed connection details are practical and easy to be implemented. Cyclic loading test results showed that the infilled concrete significantly increases the joint shear strength. The use of beam-flange stiffeners and increasing the beam width also have significant contribution to joint shear strength. Current shear strength provisions in the SRC code can be conservatively used to estimate the shear strength of the proposed beam-column joint. However, the shear strength contribution from concrete is significant under-estimated. This research proposed a strut-and-tie joint shear strength model for concrete joint shear strength. Comparison with the test results showed that the proposed model can accurately estimate the shear strength contribution from concrete of the proposed beam-column joint. However, the shear strength contribution from concrete is significantly under-estimated. This research proposed a softened-strut joint shear strength model for concrete joint shear strength. Comparison with the test results showed that the proposed model can accurately estimate the shear strength contribution from concrete of the proposed beam-column joint. Based on experimental obervations and analytical studies, modification to the current code provision on joint shear strength contribution from concrete is proposed. Moreover, the upper and lower limits on the width of the beam flange are proposed to address the constructibility issue related to concrete infilling and shear transfer from the beam to the joint. Furhermore, design suggestions on the beam flange stiffeners are proposed.

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