Experimental and analytical study on the behavior of RC beams with externally bonded carbon-FRCM composites
Experimental and analytical study on the behavior of RC beams with externally bonded carbon-FRCM composites
复制标题
外粘结碳- frcm复合材料RC梁性能的试验与分析研究
DOI：
10.1016/j.compstruct.2021.114291
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发表时间：
2021-07-01
影响因子：
6.3
通讯作者：
Zhu, Ji-Hua
中科院分区：
文献类型：
--
作者：
Wei, Liangliang;Ueda, Tamon;Zhu, Ji-Hua
本文介绍了预测具有外部粘结碳纤维增强水泥基体 (carbonFRCM) 的钢筋混凝土 (RC) 梁抗弯能力的实验和分析研究结果。首先，总结了弯曲中FRCM强化RC的可用预测方法。预测公式在织物滑移失效方面存在缺陷。在单轴拉伸载荷下测试了九个具有不同碳纤维层（CF）的碳-FRCM 样本。四根RC梁采用具有不同CF层的碳纤维FRCM进行抗弯加固，并进行了四点弯曲试验。从拉伸试验结果来看，CF的表观应变来源于碳-FRCM的整体应变，双层碳-FRCM是多层碳-FRCM设计中的优化选择。从弯曲试验结果来看，CF在织物滑移破坏中的利用效率略高于在混凝土保护层剥落中的利用效率，且随着CF层数的增加，破坏模式发生分化。此外，还提出了一种新的碳纤维FRCM加固梁弯曲预测公式，利用CF的表观应变来评估梁在不同承载情况下的加固性能。所提出的公式的预测与实验结果非常吻合。
This paper presents both experimental and analytical study results for predicting the flexural capacity of reinforced concrete (RC) beams with externally bonded carbon fabric reinforced cementitious matrix (carbonFRCM). Firstly, the available prediction approaches for FRCM-strengthened RC in flexure were summarized. The prediction formulas were deficient in the fabric slippage failure. Nine carbon-FRCM specimens with different layers of carbon fabric (CF) were tested under uniaxial tensile loading. Four RC beams were strengthened in flexure with carbon-FRCM having different layers of CF, which were tested under four-point bending. From the tensile test results, the apparent strain of CF was derived from the global strain of carbon-FRCM, and the twolayer carbon-FRCM was an optimized selection in the design of multilayer carbon-FRCM. From the bending test results, the utilization efficiency of CF was slightly higher in the fabric slippage failure than that in the peelingoff of concrete cover, and the failure mode was differentiated as the layers of CF increased. Additionally, a new procedure of prediction formulas in flexure for carbon-FRCM-strengthened beams was proposed, using the apparent strain of CF to assess the strengthening performance of beams at different load-carrying scenarios. The prediction of the proposed formulas agreed well with the experimental results.