Fracture analysis of reinforced concrete deep beam strengthened with carbon fiber-reinforced polymer (CFRP) plates was carried out. The present research aimed to discover whether crack propagation in a strengthened deep beam follows linear elastic fracture mechanics (LEFM) theory or nonlinear fracture mechanics theory. To do so, a new energy release rate based on nonlinear fracture mechanics theory was formulated on the finite element method and the discrete cohesive zone model (DCZM) was developed in deep beams. To validate and compare with numerical models, three deep beams with rectangular cross-sections were tested. The code results based on nonlinear fracture mechanics models were compared with the experimental results and the ABAQUS results carried out based on LEFM. The predicted values of initial stiffness, yielding point and failure load, energy absorption, and compressive strain in the concrete obtained by the proposed model were very close to the experimental results. However, the ABAQUS software results displayed greater differences from the experimental results. For instance, the predicted failure load for the shear-strengthened deep beam using the proposed model only had a 6.3% difference from the experimental result. However, the predicted failure load using ABAQUS software based on LEFM indicated greater differences (25.1%) compared to the experimental result.

进行了碳纤维增强聚合物（CFRP）板加固钢筋混凝土深梁的断裂分析。目前的研究旨在发现强化深梁中的裂纹扩展是否遵循线性弹性断裂力学 (LEFM) 理论或非线性断裂力学理论。为此，基于非线性断裂力学理论的新能量释放率在有限元方法的基础上制定，并在深梁中开发了离散内聚区模型（DCZM）。为了验证和与数值模型进行比较，测试了三个矩形截面的深梁。将基于非线性断裂力学模型的代码结果与实验结果和基于 LEFM 的 ABAQUS 结果进行了比较。初始刚度、屈服点和破坏载荷的预测值，所提出的模型获得的混凝土中的能量吸收和压缩应变与实验结果非常接近。然而，ABAQUS 软件的结果与实验结果显示出更大的差异。例如，使用所提出的模型预测的抗剪强化深梁的破坏载荷与实验结果只有 6.3% 的差异。然而，与实验结果相比，使用基于 LEFM 的 ABAQUS 软件预测的失效载荷显示出更大的差异 (25.1%)。使用所提出的模型预测的抗剪强化深梁的破坏载荷与实验结果只有 6.3% 的差异。然而，与实验结果相比，使用基于 LEFM 的 ABAQUS 软件预测的失效载荷显示出更大的差异 (25.1%)。使用所提出的模型预测的抗剪强化深梁的破坏载荷与实验结果只有 6.3% 的差异。然而，与实验结果相比，使用基于 LEFM 的 ABAQUS 软件预测的失效载荷显示出更大的差异 (25.1%)。