本論文主要探討碳纖維高分子複合材料(Carbon Fiber Reinforced Plastics, CFRP)所製成的CFRP棒應用於高強度混凝土梁的力學行為,並探討CFRP棒與玻璃纖維高分子複合材料(Glass Fiber Reinforced Plastics, GFRP) 所製成的GFRP棒之耐久性實驗。梁試驗採用不同強度混凝土之CFRP梁,試驗中以測力計(Load Cell)與測微計(Dial Gauge)測量各組梁試體受力與變位關係,各組梁進行比較與破壞模式分析。並將ACI 440單筋梁設計、修正ACI 440雙筋梁設計與CFRP梁試體之實驗值進行比較,提出較合理的設計公式。試驗結果顯示,CFRP梁受力與變位關係呈線性,無明顯降伏點即產生破壞,設計時宜採用工作應力法藉由安全係數防止其瞬間破壞;高強度混凝土CFRP梁撓度較小,且採高筋設計時可提高極限強度。CFRP棒與GFRP棒的耐久性實驗(耐酸、耐鹼與耐硫酸鹽試驗),由試驗結果可知CFRP棒不論在酸鹼溶液以及鹽類的環境下均有良好的耐久性,適合運用於耐久性結構,而GFRP棒在酸鹼溶液以及鹽類的環境下表現均較CFRP棒差,此結果可做為未來FRP棒製程改良或未來工程師選用材料參考。
This paper presents of the flexural behavior of high strength concrete beams reinforced with carbon fiber reinforced plastics (CFRP) rebar. Two different concrete strength and nine different types of scaled-down RC beams were used in the bending test. In the test, measured the force and displacement by Load Cell and Dial Gauge, and compared each other. According to the ACI 440 and ACI 318 codes, a modified design method was proposed for RC beam with CFRP bars. The accelerated aging tests of durability performance were used CFRP bars and glass fiber reinforced plastics (GFRP) bars under different conditions, including acid, alkaline and sulfate environment. The results showed that CFRP bars displayed excellent durability performance, the tensile strength were not reduced under each conditions. In contrast GFRP bars were residual tensile strength 67% in acid, 58% in alkaline and 70% in sulfate environment, showed that the durability performance of GFRP bars were not good.