所謂纖維加勁筋(Fiber Reinforced Polymer Bars，簡稱FRP筋) ，泛指一般所謂碳纖維或玻璃纖維複合環氧樹脂成一鋼筋型式。這類加勁筋，已開始在先進國家大量採用以取代現有鋼筋，尤其像在台灣之高腐蝕環境中。 美國混凝土學會ACI440規範編訂小組，於2006年出版有關FRP筋混凝土設計方針，但只針對梁抗彎、抗剪、及握裏檢核作設計規定，對於柱方面圍束效應計算，並未提出說明，也因此構成本研究。 本研究製作10個矩形短柱試體，以FRP箍筋取代一般橫向鋼筋，用於柱中作為圍束材料，同時也將FRP筋用於柱中作為縱向主筋。實驗採單點荷重方式，對試體進行軸壓，同時量測混凝土、主筋與箍筋應變，並觀察試體的破壞情形。實驗結果顯示，FRP縱向筋具有一定抗壓能力，而GFRP(Glass Fiber Reinforced Polymer，玻璃纖維加勁)箍筋展現出優於CFRP(Carbon Fiber Reinforced Polymer，碳纖維加勁)箍筋之圍束能力。 What we called “Fiber Reinforced Polymer Bars” is made from carbon or glass fibers mixed with polymer resin to a shape similar to steel reinforcing bars, initial as FRP bars. Nowadays, FRP bars are widely adopted in newly constructed RC structures in many countries. With respect to the highly corrosive environment as Taiwan, FRP bars as reinforcement can be considered to the new or green RC structures for sustaining their service lives. ACI committee 440 has published a new design guideline for FRP concrete members in 2006. However, the content is limited to the specifications on how to design FRP RC beams, such as moment, shear, and bond strength designs. There is no other design guide for RC columns, especially for the confined effectiveness of FRP hoops. Therefore, the research is to investigate the confining effectiveness of RC columns using FRP hoops. Ten short column specimens with rectangular section were manufactured from a local FRP industrial firm. The FRP tie bars are used as the transverse reinforcement instead of steel tie bars to confine the column. The FRP longitudinal reinforcement in some concrete columns is used. The columns were subjected to monotonically axial loading. Deformations of concrete, rebars and tie bars were measured electronically. Main results showed that the compressively carried capacity of FRP rebars cannot be ignored. The GFRP tie bars performed better behavior of confinement than the CFRP tie bars.
