Based on the experiments of five models of rc t - section beams , the ultimate shear capacity of rc t - section beams strengthened with different number of plies , paste formats and initial loads is evaluated 以五片t梁模型破坏试验为基础,研究了碳纤维布粘贴层数及方式和二次受力对钢筋混凝土t梁抗剪极限承载力的影响规律。