This paper reports 3D nonlinear finite element (FE) models of reinforced concrete (RC) beams externally strengthened with mechanically fastened (MF) and externally bonded (EB) aluminum alloy (AA) plates. The measured and observed parameters of each specimen were obtained from an experiment conducted by the authors of this study. Each FE model adopted accurate material constitutive laws and appropriate element definitions to approximate the mechanical behavior observed during testing. A total of ten models were constructed based on the diameter, embedment depth, and arrangement of the expansion anchor bolt (EAB) as well as the presence or absence of epoxy. Results like the load-carrying capacity of the tested specimens as well as the failure modes like end-plate debonding (ED), local-plate debonding (LD), and plate rupture (PR) were accurately predicted. Additionally, Stress and strain contour plots were generated to investigate the FE models’ mechanical behaviors. Finally, a parametric study was conducted to illustrate the effects of the flexural steel reinforcement ratio and AA plate grades on the models’ structural response. It was concluded that the FE models could serve as a valid predictive platform for simulating the flexural behavior of RC beams strengthened with MF and EB AA plates.

本文报告了用机械紧固 (MF) 和外部粘合 (EB) 铝合金 (AA) 板进行外部加固的钢筋混凝土 (RC) 梁的 3D 非线性有限元 (FE) 模型。每个样本的测量和观察参数是从本研究的作者进行的实验中获得的。每个有限元模型都采用准确的材料本构定律和适当的元素定义来近似测试期间观察到的机械行为。根据膨胀地脚螺栓 (EAB) 的直径、嵌入深度和布置以及环氧树脂的存在与否，共构建了十个模型。结果，如测试样品的承载能力以及端板脱粘 (ED)、局部板脱粘 (LD) 等破坏模式，和板块破裂 (PR) 被准确预测。此外，生成应力和应变等值线图以研究有限元模型的机械行为。最后，进行了参数研究以说明受弯钢筋比率和 AA 板等级对模型结构响应的影响。得出的结论是，有限元模型可以作为一个有效的预测平台，用于模拟用 MF 和 EB AA 板加强的 RC 梁的弯曲行为。