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A 1D finite element model for the flexural behaviour of RC beams strengthened with MF-FRP strips

机译：MF-FRP筋加固RC梁的一维有限元模型

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摘要

Nowadays existing reinforced concrete (RC) structures are often repaired and/or strengthened by using Fibre Reinforced Polymer (FRP) systems. Although externally bonded FRP (EB-FRP) systems are still the most widely employed ones, recent experimental studies and some field applications have demonstrated the potential of mechanically fastened FRP (MF-FRP) laminates for strengthening RC beams and slabs. The advantages of this new technique with respect to the use of EB-FRP systems are mainly in the ease of installation and the higher restraint to the possible delamination of the FRP system from the concrete surface. This paper presents a new Finite Element (FE) model capable of simulating the flexural behaviour of RC beams or slabs strengthened by using MF-FRP strips. Nonlinear bearing-stress-interface-slip laws are considered to describe the behaviour of the mechanical connection between the RC beam and the FRP strip, whereas well-established stress-strain relationships are adopted to model the behaviour of concrete, longitudinal reinforcing steel rebars and composite laminate. The model has been validated by comparing the numerical predictions with several experimental results found in the scientific literature. A good agreement has been observed between experimental and numerical results thus confirming the accuracy of the proposed model.
机译：如今，通常通过使用纤维增强聚合物（FRP）系统来修复和/或加强现有的钢筋混凝土（RC）结构。尽管外部粘结的FRP（EB-FRP）系统仍然是使用最广泛的系统，但最近的实验研究和一些现场应用表明，机械固定的FRP（MF-FRP）层压板可用于增强RC梁和平板。就使用EB-FRP系统而言，这种新技术的优势主要在于易于安装以及对FRP系统与混凝土表面可能分层的更高限制。本文提出了一种新的有限元（FE）模型，该模型能够模拟使用MF-FRP条加固的RC梁或平板的弯曲行为。考虑非线性轴承-应力-界面滑移定律来描述RC梁和FRP条之间的机械连接行为，而采用公认的应力-应变关系来模拟混凝土，纵向钢筋和混凝土的行为。复合层压板。该模型已通过将数值预测与科学文献中发现的一些实验结果进行比较而得到验证。实验结果和数值结果之间已经观察到很好的一致性，从而证实了所提出模型的准确性。

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