用 AFRP 编织条加固的 PVA 纤维增强水泥基复合材料的粘结和开裂特性

IF 4 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Fibers Pub Date : 2023-12-06 DOI:10.3390/fib11120107

Shugo Takasago, T. Kanakubo, Hiroya Kobayashi, Hideto Sasaki

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引用次数: 0

摘要

用纤维增强胶凝复合材料(FRCC)和纤维增强聚合物(FRP)棒材加固的结构易于维护和高耐久性。本研究主要研究了编织AFRP棒增强聚乙烯醇(PVA)-FRCC (AFRP/PVA-FRCC)的粘结和开裂特性。对不同键长试件进行了拉拔试验。梁试件还进行了四点弯曲试验。在拉拔试验中，实验参数包括PVA-FRCC的截面尺寸和纤维体积分数。提出了粘结本构关系(粘结应力-端滑移关系)的三线性模型。在长粘结长度试件的拉拔粘结试验中，粘结强度随着纤维体积分数的增加和试件截面尺寸的增大而增大。利用所提出的键本构律对长键长试件的键行为进行了数值分析。计算得到的平均粘结应力-载荷端滑移关系与试验结果吻合较好。在AFRP/PVA-FRCC梁试件的弯曲试验中，纤维的桥接作用表明其具有较高的延性。裂缝数量随PVA-FRCC纤维体积分数的增加而增加。当纤维体积分数为2%时，由于FRCC的压缩断裂，载荷达到最大值。考虑粘结本构规律和纤维桥接规律，用预测公式计算的PVA-FRCC裂缝宽度与试验得到的钢筋应变-裂缝宽度关系吻合较好。

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Bond and Cracking Characteristics of PVA-Fiber-Reinforced Cementitious Composite Reinforced with Braided AFRP Bars

Easy maintenance and high durability are expected in structures made with fiber-reinforced cementitious composite (FRCC) reinforced with fiber-reinforced polymer (FRP) bars. In this study, we focused on the bond and cracking characteristics of polyvinyl alcohol (PVA)-FRCC reinforced with braided AFRP bars (AFRP/PVA-FRCC). Pullout tests on specimens with varying bond lengths were conducted. Beam specimens were also subjected to four-point bending tests. In the pullout tests, experimental parameters included the cross-sectional dimensions and the fiber volume fractions of PVA-FRCC. A trilinear model for the bond constitutive law (bond stress–loaded-end slip relationship) was proposed. In the pullout bond test with specimens of long bond length, bond strength was found to increase with increases in both the fiber volume fraction and the cross-sectional dimension of the specimens. Bond behavior in specimens of long bond length was analyzed numerically using the proposed bond constitutive law. The calculated average bond stress–loaded-end slip relationships favorably fitted the test results. In bending tests with AFRP/PVA-FRCC beam specimens, high ductility was indicated by the bridging effect of fibers. The number of cracks increased with increases in the fiber volume fraction of PVA-FRCC. In specimens with a fiber volume fraction of 2%, the load reached its maximum value due to compression fracture of the FRCC. The crack width in PVA-FRCC calculated by the predicted formula, considering the bond constitutive law and the fiber bridging law, showed good agreement with the reinforcement strain–crack width relationship obtained from the tests.

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来源期刊

Fibers Engineering-Civil and Structural Engineering

CiteScore

7.00

自引率

7.70%

发文量

审稿时长

11 weeks

期刊介绍： Fibers (ISSN 2079-6439) is a peer-reviewed scientific journal that publishes original articles, critical reviews, research notes and short communications on the materials science and all other empirical and theoretical studies of fibers, providing a forum for integrating fiber research across many disciplines. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files or software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. The following topics are relevant and within the scope of this journal: -textile fibers -natural fibers and biological microfibrils -metallic fibers -optic fibers -carbon fibers -silicon carbide fibers -fiberglass -mineral fibers -cellulose fibers -polymer fibers -microfibers, nanofibers and nanotubes -new processing methods for fibers -chemistry of fiber materials -physical properties of fibers -exposure to and toxicology of fibers -biokinetics of fibers -the diversity of fiber origins