Shear strengthening of RC beams with FRP grid-reinforced ECC matrix
Shear strengthening of RC beams with FRP grid-reinforced ECC matrix
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FRP 网格增强 ECC 矩阵对 RC 梁的抗剪加固
DOI：
10.1016/j.compstruct.2020.112120
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发表时间：
2020-06-01
影响因子：
6.3
通讯作者：
Lu, Zhou-Dao
中科院分区：
文献类型：
--
作者：
Yang, Xu;Gao, Wan-Yang;Lu, Zhou-Dao
纤维增强水泥基复合材料（FRCM）越来越多地用于钢筋混凝土（RC）梁的抗弯和抗剪加固。本文介绍了一种新的FRCM系统的有效性和性能的FRP网格增强ECC矩阵（简称为“FGREM”的简称）的抗剪加固RC梁的试验研究结果。共12个剪切临界RC梁建造和测试。试验之间的参数变化包括FRP网格的类型，水泥基的类型，抗剪加固系统（预制或现浇）的安装方法，以及梁的剪跨深比。所有的测试梁的裂纹图案进行了监测，使用数字图像相关（DIC）技术。试验结果表明，抗剪加固层界面脱粘和混凝土边板剥离分别是现浇法和预制法加固梁的典型破坏模式。加固梁的抗剪承载力的增益范围为50.9%至160.6%，相对于参考梁。与现浇安装方法相比，预制FGREM被证明是更有效的钢筋混凝土梁的抗剪加固。
Fabric reinforced cementitious matrix (FRCM) composites are increasingly used for flexural and shear strengthening of reinforced concrete (RC) beams. This paper presents the results from an experimental study on the effectiveness and performance of a new FRCM system made of FRP grid-reinforced ECC matrix (referred to as "FGREM" for brevity) for shear strengthening of RC beams. A total of twelve shear-critical RC beams were constructed and tested. The parameters varied between the tests included the type of FRP grids, the type of cementitious matrix, the installation method of the shear strengthening system (prefabricated or cast-in-place), and the shear span-to-depth ratio of the beams. The crack patterns of all the tested beams were monitored using the digital image correlation (DIC) technique. Test results indicated that interfacial debonding of the shear strengthening layer and separation of the concrete side covers were two typical failure modes for the beams strengthened with the cast-in-place method and the prefabricated method, respectively. The gains in the shear capacity of the strengthened beams ranged from 50.9% to 160.6% with respect to the reference beams. Compared to the cast-in-place installation method, the prefabricated FGREM was demonstrated to be more efficient for shear strengthening of the RC beams.