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首页> 外文期刊>Magazine of Concrete Research >Nonlinear FEA of mechanical anchorages on CFRP-to-concrete bonded joint
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Nonlinear FEA of mechanical anchorages on CFRP-to-concrete bonded joint

机译：CFRP到混凝土粘结节点上机械锚固的非线性有限元分析

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The debonding of carbon fibre-reinforced polymer (CFRP) strips from the surface of concrete is one of the main premature failure modes for concrete beams that are externally strengthened with CFRP strips. Many anchorage systems are developed to prevent or delay the debonding process in these beams in order to improve the ultimate load capacities. In this study, nonlinear finite-element analyses (FEAs) are performed by employing ABAQUS software to describe the load-deflection behaviour and ultimate loading capacities of concrete beams whose flexure has been strengthened using externally bonded CFRP strips with mechanical anchorages. First, the nonlinear finite-element model results are validated using the results of an experimental study previously carried out by the authors. In the experimental study, the variables investigated are the CFRP strip width and the number and the arrangement of the mechanical anchorages. A good agreement is demonstrated between the numerical and the experimental results. Then, a parametric study is conducted to investigate the effects of the mechanical anchorages on the ultimate load capacities of concrete beams. Consequently, the variable, the CFRP bonding length, is included into the finite-element models that are corrected with the experimental results, and equations involving many variables concerned with the ultimate loading capacities are suggested. Finally, an ultimate load capacity multiplier is proposed enabling the calculation of the ultimate load capacities of beams mechanically anchored with CFRP strips, with regard to the CFRP strip width, the bonding length, the number of mechanical anchorages and the arrangement of the variables.
机译：碳纤维增强聚合物（CFRP）条从混凝土表面脱粘是CFRP条从外部进行加固的混凝土梁的主要过早破坏模式之一。开发了许多锚固系统来防止或延迟这些梁的脱胶过程，以提高最终的承载能力。在这项研究中，通过使用ABAQUS软件来进行非线性有限元分析（FEA），以描述通过使用带有机械锚固的外部粘结CFRP条加强了挠曲性的混凝土梁的荷载-挠度行为和极限荷载能力。首先，使用作者先前进行的实验研究的结果来验证非线性有限元模型的结果。在实验研究中，所研究的变量是CFRP条的宽度，机械锚固的数量和布置。在数值和实验结果之间显示出良好的一致性。然后，进行了参数研究，以研究机械锚固对混凝土梁极限承载力的影响。因此，将变量CFRP粘结长度包含在有限元模型中，并通过实验结果进行了校正，并提出了涉及许多与极限承载力有关的变量的方程。最后，提出了一个极限载荷能力乘数，该乘数使得能够计算关于CFRP条带宽度，粘结长度，机械锚固数量和变量布置的，用CFRP条机械锚固的梁的极限载荷能力。

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