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首页> 外文期刊>Construction and Building Materials >Evaluation of debonding failure of reinforced concrete girders strengthened in flexure with FRP laminates using finite element modeling
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Evaluation of debonding failure of reinforced concrete girders strengthened in flexure with FRP laminates using finite element modeling

机译：FRP层合板加固钢筋混凝土梁抗弯破坏的有限元模拟。

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The use of Fiber-Reinforced Polymer (FRP) materials dates back to the early 1940s when they were used in aerospace and naval applications. During the 1970s and early 1980s, FRP started being used in civil engineering applications for new construction, but more importantly for repair and strengthening of existing structures. However, experimental research showed that the typical failure mode of reinforced concrete (RC) structures strengthened with FRP composite materials is due to the debonding that occurs at the interface between concrete and FRP. The bond between FRP and concrete is therefore the key factor controlling the behavior of these structures since it limits the full use of the FRP strength. The paper evaluates the effect of the debonding failure on the response of FRP-strengthened RC beams. A nonlinear RC beam element with bond-slip between the concrete and the FRP laminates is developed and used to analyze several test specimens and to investigate their corresponding failure mode. The model was also used to study the reduction factor of FRP tensile strength of simply supported strengthened RC girders due to debonding failure. This reduction factor proved to be affected by several parameters: (a) the bond strength between FRP and concrete interface; (b) the concrete strength; (c) the thickness of FRP; (d) the modulus of FRP; (e) the width of FRP laminate; and (f) the development length of the FRP sheet. A large number of beam specimens were analyzed in order to conduct a thorough evaluation of debonding failure of RC beams strengthened with FRP laminates. Based on these studies, new equations that account for the aforementioned parameters were proposed to address the reduction in FRP strength due to debonding failure. 【Keywords】Composites;Laminates;Interface;Debonding;Finite element analysis
机译：纤维增强聚合物（FRP）材料的使用可以追溯到1940年代初，当时它们被用于航空航天和海军领域。在1970年代和1980年代初期，FRP开始用于新建筑的土木工程应用，但更重要的是用于维修和加固现有结构。然而，实验研究表明，用FRP复合材料增强的钢筋混凝土（RC）结构的典型破坏模式是由于在混凝土与FRP之间的界面处发生脱胶。因此，FRP和混凝土之间的粘结是控制这些结构性能的关键因素，因为它限制了FRP强度的充分利用。本文评估了脱胶失败对FRP加固RC梁响应的影响。开发了一种非线性RC梁单元，其在混凝土和FRP层压板之间具有粘结滑移，并用于分析多个试样并研究其相应的破坏模式。该模型还用于研究由于脱粘破坏而导致的简支钢筋混凝土梁的FRP抗拉强度的减小系数。事实证明，该降低因子受以下几个参数影响：（a）FRP与混凝土界面之间的粘结强度； （b）混凝土强度； （c）玻璃钢的厚度； （d）玻璃钢模量； （e）玻璃钢层压板的宽度； （f）玻璃钢片材的显影长度。为了对FRP层压板加固的RC梁的脱粘破坏进行彻底评估，对大量的梁试件进行了分析。基于这些研究，提出了解决上述参数的新方程式，以解决由于脱胶失败而导致的FRP强度降低的问题。 【关键词】复合材料；层合板；界面；脱胶；有限元分析

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