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现有的试验研究显示,碳纤维复合材料用量不同时,采用预应力碳纤维复合板加固钢筋混凝土梁可能出现3种弯曲破坏模式(包括受压破坏、受拉破坏、剥离破坏)。基于应变和力平衡的协调性,提出理论公式对3种破坏模式下的名义抗弯强度进行预测。当出现剥离破坏时,提出预应力碳纤维复合板中的受拉应变的极限。此外,考虑预应力碳纤维复合板的作用,提出开裂弯矩、裂缝宽度和加强梁的挠度计算方法。对5根采用预应力碳纤维复合板加固的钢筋混凝土梁进行试验,并通过非线性有限元分析验证所提出的理论公式。同时,预测值与其他研究者的试验结果也进行了比较。
The existing experimental studies show that there are three kinds of bending failure modes (including compression failure, tension failure and stripping failure) that may occur when reinforced concrete beams are prestressed with carbon fiber composite plates. Based on the coordination of strain and force balance, the theoretical formula is proposed to predict the nominal bending strength under three failure modes. When peeling failure occurs, the limit of tensile strain in prestressed carbon fiber composite board is proposed. In addition, considering the effect of prestressed carbon fiber composite board, the calculation methods of cracking moment, crack width and strengthening beam deflection are proposed. Five reinforced concrete beams reinforced with prestressed carbon fiber composite plates were tested, and the proposed theoretical formula was verified by nonlinear finite element analysis. At the same time, the predicted values are also compared with those of other researchers.