??本實驗主要是研究RC梁澆鑄介面冷縫對梁構件耐震行為影響，故利用測試梁主筋為高拉力SD685 (MPa) 螺紋節鋼筋之有翼版T形懸臂梁耐震行為，來討論有無冷縫對RC梁影響。目前大多數交接面剪應力檢核之規範與經驗公式並無考慮耐震行為對整體構件之影響，並受限於鋼筋強度，本文將探討目前規範與經驗公式是否可應用於當構件受反覆載重時的可行性以及提高鋼筋強度後構件之行為。??由實驗結果可知，高拉力鋼筋T形梁(a/d=5.46)有澆鑄冷縫時，比整體澆鑄無冷縫之構件較早出現水平梁向裂縫。另外，若於冷縫之構件考慮鋼筋截斷，可發現含冷縫之構件其截斷處有較密集的裂縫生成。由T形梁試體交接面剪應力分析結果可知，不論構件是否考慮冷縫的存在，構件於耐震行為下並無影響。?The experimental study mainly focused on the influence of construction cold joints existed between slabs and beam webs on the seismic behavior of high strength reinforced concrete T-beams with screwed SD685 steel bars. Most of the interfacial shear stress of code specified empirical formula did not consider the seismic effect. The study will discuss the feasibility of the code and empirical formula when the RC structures are subjected to cyclic loading.?The experimental results show, some premature cracks horizontal to beam direction were found in the T-shaped beam (a/d =5.46) with construction cold joint. In addition, more cracks generated in the neighborhood of the beam bar cut-off than the beam without beam bar cut-off. The results of high tensile steel T-beam interface shear stress analysis showed that, regardless of the member with or without cold joints, there is no impact on the seismic behavior.
