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Experimental/Analytical Study on Interfacial Fracture Energy and Fracture Propagation Along FRP-Concrete Interface

机译：沿FRP - 混凝土界面界面骨折能量和断裂繁殖的实验/分析研究

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The initiation and propagation of interfacial cracks along the FRP-concrete interface may affect the concrete cracking behavior, load-carrying capacities, and stiffness characteristics.. Moreover, fracture in the shear stress transfer region may also lead to brittle premature failures of FRP-strengthened structures. All these factors must be taken into account in structure strengthening design. In order to estimate and simulate the fracture behavior of FRP-strengthened concrete structures, some basic material and physical parameters such as interfacial fracture energy, local interfacial shear strength and effective bond length are determined by some fundamental experiments. In this paper, experimental program using single-lap shear test and double-lap shear test specimens are presented. The variables include different types and layers of FRP sheets, and different types of the concrete surface preparation prior to bonding. Also, nonlinear equations, derived for two typical local shear-deformation curves with and without softening behavior, are used to discuss the shear stress transfer and fracture propagation behavior by comparing with experimental results. Through these experimental/analytical results, the interfacial fracture energies and the local shear stress-relative displacement relationships are determined.
机译：沿FRP - 混凝土界面的界面裂缝的启动和传播可能影响混凝土裂缝行为，承载能力和刚度特性。此外，剪切应力转移区域的断裂也可能导致FRP加强的脆性过早失效结构。所有这些因素都必须在结构加强设计中考虑。为了估计和模拟FRP加强的混凝土结构的断裂行为，通过一些基本实验确定一些基本材料和诸如界面骨折能量，局部界面剪切强度和有效键长的物理参数。本文提出了使用单圈剪切试验和双圈剪切试样的实验程序。该变量包括不同类型和层的FRP片材，以及在键合之前的不同类型的混凝土表面制备。此外，对于两个具有和不具有软化行为的典型局部剪切变形曲线的非线性方程，用于通过与实验结果进行比较来讨论剪切应力转移和断裂传播行为。通过这些实验/分析结果，确定界面裂缝能量和局部剪切应力相对位移关系。

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