在1999年集集大地震後，台灣國家地震工程研究中心針對既有建物的耐震能力評估與補強技術展開一系列的研究與試驗，隨著新型混凝土材料的發展，高強度混凝土的應用雖然可以節省材料的用量及減少結構物重量等效益，但其性質較脆性，容易於發生破壞時產生強度驟降，相較之下，本研究主要利用超高性能纖維混凝土(Ultra-High Performance Fiber Reinforced Concrete, UHPFRC)補強於鋼筋混凝土梁柱接頭，藉由提高混凝土強度，不僅能夠有效減少補強後之尺寸，且混凝土中之鋼纖維可藉由橋接效應，增加混凝土拉力強度、提高能量消散能力。本研究依照早期梁柱接頭典型缺失，設計一座非韌性鋼筋混凝土梁柱外部接頭試體作為控制組，使用六種不同補強方式探討其對於既有接頭之補強效益，另外使用UHPFRC與鋼筋網補強兩座已達完全倒塌狀態之梁柱接頭，探討其補強方法對於受損接頭之補強效益。
根據試驗結果與分析，不論補強前梁柱接頭為既有或受損狀態，超高性能纖維混凝土做為補強材料均可有效改變試體之破壞模式，提升32%~66%之試體側向強度、35%~217%能量消散能力等耐震能力，同時可以降低試體損傷值，提升結構物體抗地震力受損之能力，其中以UHPFRC與鋼筋網搭配使用可呈現更顯著的補強效益。此外，UHPFRC與鋼筋網之預鑄補強之工法亦能得到與場鑄補強工法相近的補強效益，此方法可簡化施工的程序並縮短工時，提高補強施工的效率。

After Chi-Chi earthquake in 1999, Taiwan National Center for Research on Earthquake Engineering started to conduct a series of research and experiments for the seismic assessment and retrofit techniques of existing building. With development of new concrete materials, application of high strength concrete (HSC) is effective to reduce the usage of material and the weight of the structure. However, HSC showed brittle behavior and dramatic drop of strength after member cracking. Ultra-high performance fiber reinforced concrete (UHPFRC) was used to retrofit reinforced concrete beam-column joints (BCJs) in this study. Dimensions of member section can be decreased after retrofitting by increasing concrete compressive strength. Furthermore, addition of steel fiber in the concrete increased tensile strength and ability of energy dissaption due to fiber bridging effect. According to the typical substandard reinforcing detail in old existing building, a non-ductile reinforced concrete exterior BCJ was designed as control specimen. Six different retrofitting solutions were applied to investigate the effectiveness of UHPFRC for retrofitting existing BCJs. In addition to retrofitting existing BCJs, two BCJs which experienced complete damaged retrofitted by UHPFRC and steel mesh were included in this study. Due to the test result, the applictation of UHPFRC to retrofit existing and damaged BCJs showed significant effectiveness. UHPFRC jacket provided a considerable increase in strength by 35%~66% and ability of energy dissipation by 35%~217%. Damaged index can be also reduced after retrofitting.

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