This article presents an experimental study aiming to provide reliable experimental data for the prediction of the shear strength of reinforced concrete beams without stirrups. The shear strength results obtained from the proposed model as well as those from the design codes (ACI 318, Eurocode 2 and BS 8110) are compared with the database containing 700 beams made of both high strength concrete and normal strength concrete. Furthermore, the experimental results were used to assess the contribution of each shear mechanism obtained from Chen’s, Cavagnis’s and Fernández Ruiz’s models. The contribution of these various shear-transfer actions is also quantified experimentally, using a digital image correlation. As a result, the measured contributions of dowel action, aggregate interlock and compression zone to the total shear resistance were estimated as 45% to 50%, 20% to 35% and 17% to 31%, respectively, for high strength concrete beams. On the contrary, the average test-to-predicted contribution of the shear-transfer action ratio determined by the Chen formula is 1.15 for short beams, whereas the Fernández Ruiz and the Cavagnis models yielded average ratios of 1.04 and 1.52, respectively, for slender beams. The proposed formulae give a rational prediction for either both short and slender beams, and yield accurate and consistent results compared to the other models used in this study, with a lowest average value of the test-to-predicted at 1.08 and that of the coefficient of variation at 23.06%, particularly for short beams. However, ACI 318 is the only code that does not take into account the size effect, leading to a severe underestimation of the shear strength for short beams.

中文翻译：

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使用数字图像相关性量化钢筋混凝土梁的抗剪强度：实验和分析研究

本文提出了一项试验研究，旨在为预测无箍筋钢筋混凝土梁的抗剪强度提供可靠的试验数据。从建议的模型和设计规范（ACI 318、欧洲规范 2 和 BS 8110）获得的剪切强度结果与包含 700 根高强度混凝土和普通强度混凝土梁的数据库进行了比较。此外，实验结果用于评估从 Chen 的、Cavagnis 的和 Fernández Ruiz 的模型中获得的每种剪切机制的贡献。这些各种剪切传递作用的贡献也使用数字图像相关性通过实验量化。因此，销钉作用的测量贡献，对于高强度混凝土梁，骨料互锁和压缩区对总抗剪强度的估计分别为 45% 至 50%、20% 至 35% 和 17% 至 31%。相反，对于短梁，由 Chen 公式确定的剪切传递作用比的平均测试预测贡献为 1.15，而 Fernández Ruiz 和 Cavagnis 模型分别为细长梁产生了 1.04 和 1.52 的平均比值。梁。所提出的公式对短梁和细长梁都给出了合理的预测，与本研究中使用的其他模型相比，得出的结果准确且一致，测试预测的最低平均值为 1.08，系数的平均值为的变化为 23.06%，特别是对于短梁。但是，ACI 318 是唯一没有考虑尺寸效应的代码，