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首页> 外文期刊>Magazine of Concrete Research >Axial strength and deformability of concrete confined with natural fibre-reinforced polymers
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Axial strength and deformability of concrete confined with natural fibre-reinforced polymers

机译：天然纤维增强聚合物限制的混凝土的轴向强度和可变形性

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This paper presents the results of an experimental study on the compressive behaviour of concrete confined by natural fibre-reinforced polymer (NFRP) jackets which are formed by embedding sisal fibres in an epoxy resin matrix. The sisal fibres are one of the cost-effective materials for use in seismic strengthening applications where a moderate increase in strength and ductility is required. This study has two main objectives: the first is to investigate the effectiveness of NFRP composites in increasing the strength and deformability of confined concrete. For the second objective, the performance of existing strength models developed for conventional synthetic fibre-reinforced polymers is assessed. For this, 36 concrete specimens were tested under uni-axial compression. The study parameters covered the NFRP thickness, concrete strength and cross-sectional shape. Test results indicated that the NFRP confinement is significantly effective in increasing the strength and deformability of confined concrete. Furthermore, it is found that none of the existing considered models is capable of accurately predicting the ultimate strength and strain of NFRP-confined concrete. Finally, new strength models are proposed to predict the compressive strength of circular and square sections. The strengths predicted by the proposed models are found to have a good agreement with experimental results.
机译：本文介绍了对天然纤维增强聚合物（NFRP）护套（由将剑麻纤维嵌入环氧树脂基体中形成的护套）限制的混凝土的压缩性能的实验研究结果。剑麻纤维是要求强度和延展性适度提高的抗震加固应用中经济有效的材料之一。这项研究有两个主要目标：第一个是研究NFRP复合材料在提高承压混凝土的强度和可变形性方面的有效性。对于第二个目标，评估了为常规合成纤维增强聚合物开发的现有强度模型的性能。为此，在单轴压缩下测试了36个混凝土试样。研究参数涵盖了NFRP厚度，混凝土强度和横截面形状。测试结果表明，NFRP约束在提高约束混凝土的强度和可变形性方面非常有效。此外，发现现有模型都无法准确预测NFRP约束混凝土的极限强度和应变。最后，提出了新的强度模型来预测圆形和正方形截面的抗压强度。发现所提出的模型预测的强度与实验结果具有很好的一致性。

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