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对4根CFRP同时加固正、负弯矩区的T形截面两跨连续梁进行了试验,对CFRP加固连续梁的承载能力、裂缝开展、变形及碳纤维和钢筋的应力、应变情况进行了研究。结果表明:通过CFRP加固,连续梁的极限弯矩和屈服弯矩均得到较大提高;增强了连续梁的抗弯刚度,连续梁挠度至少减小60%;延缓了裂缝的出现,有效地减小了裂缝宽度、间距;U形箍可以保护底部CFRP,并提高CFRP的使用效率。验算了CFRP加固受弯构件的抗弯承载力计算公式并对其提出修改建议;对CFRP加固的连续梁进行了延性分析;分析了CFRP加固连续梁后的内力重分布情况并提出弯矩调幅系数。
Four T-shaped cross-section continuous beams with CFRP reinforcement in both positive and negative moments were tested. The bearing capacity, crack initiation, deformation and stress and strain of CFRP strengthened continuous beams were studied. The results show that the ultimate bending moment and yielding moment of continuous beam are greatly enhanced by CFRP reinforcement, the bending stiffness of continuous beam is enhanced, the deflection of continuous beam is reduced by at least 60%, the occurrence of cracks is delayed, and the effective reduction Small crack width, spacing; U-shaped hoop can protect the bottom of the CFRP, and improve the efficiency of CFRP. The calculation formula of flexural capacity of CFRP strengthened flexural members was calculated and proposed. The ductility analysis of CFRP reinforced continuous beams was carried out. The internal force redistribution of CFRP reinforced continuous beams was analyzed and the moment modulation index .