Fatigue behaviour and design of corroded reinforced concrete beams intervened by ICCP-SS
Fatigue behaviour and design of corroded reinforced concrete beams intervened by ICCP-SS
复制标题
ICCP-SS 干预的腐蚀钢筋混凝土梁的疲劳行为和设计
DOI：
10.1016/j.compstruct.2020.113295
复制
发表时间：
2021-02-12
影响因子：
6.3
通讯作者：
Xing, Feng
中科院分区：
文献类型：
--
作者：
Su, Mei-ni;Wei, Liang-liang;Xing, Feng
为了提高退化钢筋混凝土（RC）梁的抗疲劳性能，本研究采用了双功能干预，外加电流阴极保护和结构加固（ICCP-SS）。本文介绍了腐蚀简支梁与ICCP-SS干预的疲劳性能的实验和分析研究的结果。实验方案包括16钢筋混凝土梁进行加速腐蚀和ICCP，然后进行四点弯曲试验。试验结果表明，阴极保护能有效地防止钢筋锈蚀。更重要的是，ICCP-SS干预显著提高了受弯构件的抗疲劳性。与未采取任何附加措施的锈蚀梁相比，处理后梁的疲劳寿命显著提高，提高幅度高达202%。ICCP-SS干预的梁由于钢筋的疲劳断裂以及碳纤维网的滑移和断裂而失效。在受到ICCP-SS干预的梁的破坏点处观察到一定量的延性。此外，实验结果与欧洲和日本的设计规范以及中国的设计规范的预测进行了比较。
To improve the fatigue resistance of degraded reinforced concrete (RC) beams, the present study employs a dual-functional intervention, impressed current cathodic protection and structural strengthening (ICCP-SS). This paper presents the results of an experimental and analytical study of the fatigue performance of corroded simply supported beams with ICCP-SS intervention. The experimental programme comprises 16 RC beams subjected to accelerated corrosion and ICCP followed by four-point bending tests. The test results show that the corrosion of the steel reinforcements in the cathodically protected beams is effectively prevented. More importantly, the ICCP-SS intervention significantly enhances the fatigue resistance of the flexural members. In comparison to those of the corroded beams without any additional measures, the fatigue lives of the treated beams are significantly improved, by as much as 202%. The beams with the ICCP-SS intervention fail due to fatigue fracture of the steel reinforcement followed by a combination of slippage and rupture of the carbon fibre meshes. An amount of ductility is observed at the point of failure of the beams subjected to ICCP-SS intervention. In addition, the experimental results are compared with the predictions of the European and Japanese design codes as well as the Chinese design codes.