guidelines require an adequate overlap length for reinforcing bars, especially in extended spans of elements constructed from Reinforced Concrete (RC). Insufficient overlap can have adverse effects on key characteristics like bending strength and deformability of RC beams. The potential danger of failure in such elements is a significant concern as is considered a potential threat, and this study addresses it through experimental identification and numerical analysis to be mitigated carefully in this study to enhance the safety and sustainability of buildings to mitigate the risk of failure. The current investigation is centered on investigating the structural behavior of cantilevered RC beams exhibiting inadequate overlap between reinforcing bars in the hogging moment region. These beams have been strengthened through the application of ferrocement layers of Engineered Cementitious Composite (ECC). The experimental study consisted of eleven beams, which were categorized into four groups and subjected to bending loads until they reached failure. The research assessed various factors, such as the casting method (whether cast-in-situ or precast), the installation technique (involving the use of epoxy, or epoxy with anchors), and the length of the ECC layer. This layer was configured to have a length of 30Ø, 40Ø, and 50Ø, with Ø representing the diameter of the reinforcing bars along the zone subjected to hogging moments. According to findings, strengthening of specimens exhibiting insufficient steel overlap through an ferrocement ECC layer exhibited an improved overall structural behavior compared to the defective control beam. The most significant enhancement in both failure mode and load-deflection behavior was observed in beams strengthened through the incorporation of a cast-in-situ ECC layer with anchor bolts. Additionally, augmenting the strengthening length not only increased the initial stiffness of the reinforced beams but also enhanced their energy absorption capacity. Furthermore, the study involved the construction of a numerical simulation employing the Finite Element Method (FEM) simulating the observed behavior in experimentally tested beams. The model's precision was validated through a comparison of its results with the experimental data, revealing a satisfactory level of accuracy.

中文翻译：

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使用可持续增强 ECC 层增强搭接拼接钢筋不足的悬臂 RC 梁

指南要求钢筋有足够的重叠长度，特别是在由钢筋混凝土 (RC) 建造的构件的跨度较大的情况下。重叠不足会对 RC 梁的弯曲强度和变形能力等关键特性产生不利影响。这些元件的潜在故障危险是一个重大问题，因为被认为是潜在威胁，本研究通过实验识别和数值分析来解决这个问题，并在本研究中仔细减轻，以提高建筑物的安全性和可持续性，以减轻风险失败。当前的研究重点是研究悬臂 RC 梁的结构行为，该梁在中拱力矩区域中钢筋之间的重叠不足。这些梁通过工程水泥复合材料 (ECC) 的钢筋水泥层的应用得到了加固。该实验研究由十一个梁组成，这些梁被分为四组，并承受弯曲载荷直至失效。该研究评估了各种因素，例如铸造方法（现场铸造还是预制）、安装技术（涉及使用环氧树脂或带锚固的环氧树脂）以及 ECC 层的长度。该层的长度配置为 30Ø、40Ø 和 50Ø，Ø 代表沿承受中拱力矩区域的钢筋直径。根据研究结果，与有缺陷的控制梁相比，通过钢筋水泥 ECC 层对钢重叠不足的样本进行加固，表现出整体结构性能的改善。在通过结合现浇 ECC 层和锚栓加固的梁中观察到了失效模式和载荷-挠度行为的最显着增强。此外，增加加固长度不仅增加了加固梁的初始刚度，而且增强了其能量吸收能力。此外，该研究还涉及采用有限元法（FEM）构建数值模拟，模拟实验测试梁中观察到的行为。通过将其结果与实验数据进行比较，验证了模型的精度，显示出令人满意的精度水平。