In a recent experimental research, the authors measured the circumferential strains on the cylindrical envelope of concrete specimens during pull-out tests. This paper presents a theoretical approach, complementing the previous experimental study, aiming at predicting these measured circumferential strains and developing the understanding of the three-dimensional behavior of the concrete cylinder. The proposed approach accounts for the specimen materials and geometrical parameters including the ribs and strain gauges locations and proposes an expression for the normalized and absolute circumferential strains along the specimen circumference due to ribs actions. This paper presents a new three-dimensional model of the specimen behvior during a pull-out test, which provides new insight on bond mechanics and illuminates the role of the radial pressures developed as part of the bond action. Several simulations were performed on specimens with three different diameters, two concrete strengths, and a different number of bonded ribs. All the simulations show very good agreement with the measured strain data. This study enhances the understanding of bond resistance during a pull-out process and contributes to the understanding of the ring action that is developed in a concrete cylinder during a pull-out test.

中文翻译：

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在拉拔试验期间预测圆柱形混凝土试件的周向应变

在最近的一项实验研究中，作者在拉拔试验期间测量了混凝土试样圆柱形外壳上的周向应变。本文提出了一种理论方法，补充了之前的实验研究，旨在预测这些测量的圆周应变并加深对混凝土圆柱体三维行为的理解。所提出的方法考虑了试样材料和几何参数，包括肋条和应变片位置，并提出了由于肋条作用而沿试样圆周的归一化和绝对周向应变的表达式。本文提出了一种新的拉拔试验中试样行为的三维模型，它提供了对粘合力学的新见解，并阐明了作为粘合作用一部分而产生的径向压力的作用。对具有三种不同直径、两种混凝土强度和不同数量的粘合肋的试样进行了多次模拟。所有的模拟都显示出与测量的应变数据非常吻合。这项研究增强了对拔出过程中粘结阻力的理解，并有助于理解在拔出试验期间在混凝土圆柱体中产生的环作用。