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首页> 外文期刊>Construction and Building Materials >Flexural behavior of reinforced concrete beams strengthened with ultra-high performance fiber reinforced concrete
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Flexural behavior of reinforced concrete beams strengthened with ultra-high performance fiber reinforced concrete

机译：超高性能纤维增强混凝土加固钢筋混凝土梁的抗弯性能

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摘要

In this study, the effectiveness and efficiency of two different techniques for strengthening of reinforced concrete (RC) beams using ultra-high performance fiber reinforced concrete (UNPFRC) was investigated i.e.; (i) by sand blasting RC beams surfaces and casting UHPFRC in-situ around the beams inside a mold and (ii) by bonding prefabricated UHPFRC strips to the RC beams using epoxy adhesive. Beams under each technique were strengthened in three different strengthening configurations; (i) bottom side strengthening (ii) two longitudinal sides strengthening (iii) three sides strengthening. Bond strength tests were carried out to ascertain the bond between normal concrete and the UHPFRC, for both sand blasting and epoxy adhesive techniques. Test results for retrofitted beams under flexure regarding various behavioral attributes such as crack propagation, stiffness and failure load indicated significant positive developments resulting from the two strengthening techniques. Beams strengthened on three sides showed the highest capacity enhancement, while beams strengthened only at the bottom side showed the least enhancement. However, there were some concerns regarding loss of ductility with increased use of UHPFRC as part of the tensile retrofit. Finite element (FE) and analytical model were developed to predict the behavior of the beam specimens. The result of the models showed good agreement with experimental results, as they were able to predict the behavior of the beams with high accuracy. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在这项研究中，研究了两种不同技术使用超高性能纤维增强混凝土（UNPFRC）加固钢筋混凝土（RC）梁的有效性和效率，即： （i）喷砂RC梁表面并在模具内的梁周围现场浇铸UHPFRC，以及（ii）使用环氧树脂粘合剂将预制的UHPFRC条带粘结到RC梁上。每种技术下的梁都以三种不同的加固构造进行加固； （i）底面加固（ii）两个纵向面加固（iii）三个面加固。进行了结合强度测试，以确定用于喷砂和环氧胶粘技术的普通混凝土与UHPFRC之间的结合。弯曲梁在各种行为属性（例如裂纹扩展，刚度和破坏载荷）下的弯曲测试结果表明，这两种加固技术产生了明显的积极发展。在三个侧面加固的梁显示出最大的增强能力，而仅在底部加固的梁显示出最小的增强能力。但是，由于在拉伸改造中增加了UHPFRC的使用，人们对延展性的损失有些担忧。开发了有限元（FE）和分析模型来预测梁试样的行为。模型的结果表明与实验结果吻合良好，因为它们能够高精度地预测光束的行为。 （C）2016 Elsevier Ltd.保留所有权利。

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