Shear strengthening of RC beams with corrosion-damaged stirrups using FRP grid-reinforced ECC matrix composites
Shear strengthening of RC beams with corrosion-damaged stirrups using FRP grid-reinforced ECC matrix composites
复制标题
使用 FRP 网格增强 ECC 基复合材料对带有腐蚀损坏箍筋的 RC 梁进行剪切强化
DOI：
10.1016/j.compstruct.2021.114229
复制
发表时间：
2021-09
影响因子：
6.3
通讯作者：
Yan Yuhong
中科院分区：
文献类型：
--
作者：
Zheng Aohan;Li Shan;Zhang Dengfeng;Yan Yuhong
本文介绍了一种纤维增强聚合物（FRP）网格增强工程水泥基复合材料（ECC）矩阵加固钢筋混凝土（RC）梁的抗剪性能的试验研究与腐蚀损坏箍筋。共制备了18根梁试件，包括4根参考梁和14根加固梁，并进行了试验。在使用电化学加速方法将箍筋腐蚀到预期比例后，移除侧向腐蚀损坏的混凝土保护层，然后使用FRP网格增强ECC矩阵（FGREM）进行修复。主要试验参数包括钢筋锈蚀程度、剪跨比、FRP格栅类型和加固量。试验结果表明，采用该技术修复后，箍筋锈蚀梁的抗剪承载力得到了显著提高。内嵌FRP网格能够有效分担箍筋所承受的剪力，ECC由于其良好的应变硬化性能，改善了试件的变形特性和能量吸收能力。提出了基于桁架-拱模型的加固梁抗剪承载力的理论计算公式，并采用改进的缺陷点分类法（DPC）进行了评估，验证了该计算公式的安全性和准确性。
This paper presents an experimental investigation of the shear behavior of reinforced concrete (RC) beams with corrosion-damaged stirrups strengthened using a fiber-reinforced polymer (FRP) grid-reinforced engineered cementitious composite (ECC) matrix. A total of 18 beam specimens, including four referential beams and 14 strengthened beams, were prepared and tested. After corroding the stirrups to the expected ratio using the electrochemically accelerated method, the lateral corrosion-damaged concrete cover was removed, and then repaired using the FRP grid-reinforced ECC matrix (FGREM). The main test parameters included the stirrup corrosion level, shear-span ratios, and types and strengthening amounts of the FRP grid. Based on the experimental results, the shear bearing capacity of the beams with corrosion-damaged stirrups improved significantly after being restored using this technique. The embedded FRP grid could effectively share the shear force borne by the stirrups and the ECC improves the deformation characteristics and energy absorption of the specimen owing to its excellent strain-hardening behavior. Furthermore, a theoretical calculation formula was proposed to predict the shear bearing capacity of the strengthened beams based on the truss-arch model, which was confirmed to be safe and accurate after being assessed using the modified version of the demerit points classification (DPC) method.
登录
查看更多内容
复合加固层加固钢筋混凝土梁的弯曲性能：BFRP 网格和 ECC
影响因子：
7.4
作者：
Yu-Zhou Zheng;Wen-Wei Wang;John C. Brigham
通讯作者：
John C. Brigham
影响因子：
1.8
作者：
A. El-Sayed;R. Hussain;A. Shuraim
通讯作者：
A. El-Sayed;R. Hussain;A. Shuraim
影响因子：
7.4
作者：
J. Zeng;W. Gao;Zhi-Jian Duan;Yu Bai;Yong-Chang Guo;Li-jun Ouyang
通讯作者：
J. Zeng;W. Gao;Zhi-Jian Duan;Yu Bai;Yong-Chang Guo;Li-jun Ouyang
影响因子：
--
作者：
Rui Guo;Lianheng Cai;S. Hino;Bo Wang
通讯作者：
Rui Guo;Lianheng Cai;S. Hino;Bo Wang
影响因子：
6.3
作者：
V. P. Berardi;L. Feo;G. Mancusi;M. D. Piano
通讯作者：
V. P. Berardi;L. Feo;G. Mancusi;M. D. Piano