在抗彎矩構架中，整體建築物在重力效應與地震傾倒力矩的影響，外柱所承受的軸力隨著傾倒力矩的方向與大小發生變化，因此評估梁柱接頭之受力變形行為時，應將柱構件之軸力變化與水平位移δ對剪力所造成的影響也考慮在內。在傳統RC造外柱梁柱接頭中，梁普遍以90º彎鉤錨定於柱中，但New RC採用之SD685鋼筋因強度較高，不利鋼筋彎折，故不建議採用標準彎鉤錨定，因此本研究使用灌漿式螺紋端部錨定頭(Plate Nuts)作為螺紋鋼筋之端部錨定裝置，驗證符合ACI 318-14規範規定之錨定長度是否可應用於台灣新型鋼筋混凝土(New RC)結構系統。
本研究共進行四組外柱梁柱接頭試驗，主要針對New RC材料強度是否適用於ACI 318規範進行探討，包括鋼筋及混凝土材料強度上限值、擴頭鋼筋淨間距、錨定長度、接頭剪力比，並觀察柱構件在P-δ效應下是否產生二次彎矩影響接頭強度，本次也藉由推柱端部之施測方式與傳統推梁端部的形式作比較，探討此兩者行為是否相符合。

In the moment resisting frames, impacts of gravity effect and dumping moment of earthquakes on the entire building cause the axial force that exterior beam-column joints bear to vary depending on the direction and size of the dumping moment. As a result, the axial force variation of columns and impacts of horizontal displacement δ on shears should be taken into consideration, while evaluating the seismic capacity and deformation behavior of beam-column joints. In traditional RC exterior beam-column joints, beams are typically anchored in columns at a 90º angle. However, since the SD685 steel rebars adopted in New RC are enhanced with higher strength, the rebars are not vulnerable to bending, and thus standard hooks are not recommended for use. This study adopted nuts of head as the anchorage device of threaded-reinforcement, aiming to verify if the anchored length that complies with ACI 318-14 requirements can be applied to Taiwan’s New RC structures.
This study carried out four tests on exterior beam-column joints in total, targeting on exploring if the material strength of the New RC structures is in compliance with the ACI 318 requirements, including the maximum strength of steel reinforcement bars and concrete materials, the clear spacing of headed bars, the development of reinforcement, and the shear zone demand and capacity ratio of beam-column joints in intersection areas. The columns are also observed to explore if secondary moment happens under P-δ Effect and the impacts on the strength of joints. Moreover, the study made a comparison between the test methods of push columns and the forms of traditional push beams to explore the consistency of both behaviors.

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