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首页> 外文会议>ACI Annual Convention on Fracture Mechanics for Concrete Materials: Testing and Applications, Mar 27, 2000, San Diego, California >Experimental/Analytical Study on Interfacial Fracture Energy and Fracture Propagation Along FRP-Concrete Interface
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Experimental/Analytical Study on Interfacial Fracture Energy and Fracture Propagation Along FRP-Concrete Interface

机译：FRP-混凝土界面界面断裂能和断裂扩展的实验/分析研究

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摘要

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：沿着FRP-混凝土界面的界面裂纹的萌生和扩展可能会影响混凝土的开裂行为，承载能力和刚度特性。此外，剪切应力传递区域的断裂还可能导致FRP加固的脆性过早破坏。结构。在结构加固设计中必须考虑所有这些因素。为了估算和模拟FRP加固混凝土结构的断裂行为，通过一些基础实验确定了一些基本材料和物理参数，例如界面断裂能，局部界面剪切强度和有效粘结长度。在本文中，提出了使用单圈剪切试验和双圈剪切试验样品的实验程序。变量包括不同类型和层数的FRP板，以及粘结前不同类型的混凝土表面处理。此外，针对具有和不具有软化行为的两条典型局部剪切变形曲线推导的非线性方程，通过与实验结果进行比较来讨论剪切应力的传递和断裂扩展行为。通过这些实验/分析结果，确定了界面断裂能和局部切应力相对位移关系。

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