Abstract

One of the most important design approaches in the repairing/strengthening details is using CFRP (Carbon Fiber Reinforced Polymer) to delay the debonding of the CFRP strips/plates from the surface to take full advantage of the CFRP reinforcement. Compared to non-anchored strips, research studies regarding bond-slip models developed for fan type CFRP anchors and anchored CFRP strips to strengthen details are limited in the related literature review. However, in studies on this subject, anchors are placed at 90^° to the axial tensile force applied to the CFRP strips. The ultimate load-bearing capacity and bond-slip models of CFRP strips with the different angled CFRP fan type anchor under axial tensile force have not been found in the literature review. Within the study's scope, 28 angled CFRP strip test specimens were produced and then tested under the effect of monotonically increasing axial tensile force with an experimental setup designed by the authors. The variables examined in this study were the concrete compressive power, the CFRP strip's width, the number of the CFRP anchor fan type, and the angle of the anchor placed on the CFRP strip. As a result of the study, an equation was proposed for calculating the ultimate load-bearing capacity of angled anchored CFRP strips and angled anchored CFRP strips. Finally, a new proposal for the bond-slip model was developed. It is thought that the new interface bond-slip model developed for CFRP strips with different angles will make an important contribution to the literature. It can be used in finite element analysis to realistically analyze the capacities and load-displacement behavior of reinforced concrete structural elements by strengthening such strips.

摘要

修复/加固细节中最重要的设计方法之一是使用 CFRP（碳纤维增强聚合物）来延迟 CFRP 条/板从表面的剥离，以充分利用 CFRP 增强。与非锚固条相比，有关为扇形CFRP锚杆和锚固CFRP条开发的粘结滑移模型以加强细节的研究在相关文献综述中受到限制。然而，在这个主题的研究中，锚被放置在 90 ^°施加在 CFRP 条上的轴向拉力。文献综述中未发现具有不同角度CFRP扇形锚杆的CFRP条带在轴向拉力作用下的极限承载能力和粘结滑移模型。在研究范围内，制作了 28 个有角度的 CFRP 条状试样，然后使用作者设计的实验装置在轴向拉力单调增加的影响下进行测试。本研究中检查的变量是混凝土抗压能力、CFRP 带的宽度、CFRP 锚扇类型的数量以及放置在 CFRP 带上的锚的角度。作为研究的结果，提出了一个计算斜角锚固CFRP条和斜角锚固CFRP条的极限承载能力的方程。最后，开发了一种新的键滑模型建议。人们认为，为不同角度的 CFRP 条开发的新界面键-滑移模型将对文献做出重要贡献。它可用于有限元分析，通过加强此类条带，真实地分析钢筋混凝土结构构件的承载力和荷载位移行为。