Experimental study on hysteretic behavior for corroded circular RC columns retrofitted by ICCP-SS
Experimental study on hysteretic behavior for corroded circular RC columns retrofitted by ICCP-SS
复制标题
DOI：
10.1016/j.istruc.2021.10.039
复制
发表时间：
2021-11-19
期刊：
影响因子：
4.1
通讯作者：
Zhu, Ji-Hua
中科院分区：
文献类型：
--
作者：
Feng, Ran;Zhang, Jingzhou;Zhu, Ji-Hua
对9根圆形钢筋混凝土柱进行了试验研究，其中1根柱试件作为参比组，其余8根柱试件进行了加速腐蚀试验。加速腐蚀180 d后，对其中2根腐蚀柱进行外加电流阴极保护（ICCP），对另外6根腐蚀柱进行结构加固（SS）。采用碳纤维布增强水泥基复合材料（C-FRCM）作为阳极和增强材料，将ICCP和SS结合使用，即ICCP-SS。最后，试件在不同的轴向载荷下在水平方向上循环加载。结果表明，腐蚀使试件的承载能力和耗能能力下降。这种现象在较高的轴向载荷下更为严重。ICCP-SS技术的双重功能不仅可以提高钢筋混凝土柱的承载力和耗能能力，而且可以减少钢筋的持续腐蚀。这些益处可以归因于C-FRCM复合材料提供的对柱基的约束效应和使用C-FRCM复合材料中的碳织物网作为阳极的ICCP效应。
An experimental study on nine circular reinforced concrete (RC) columns is presented in this paper, wherein one column specimen was adopted as the reference group, the other eight specimens were subjected to accelerated corrosion. After the accelerated corrosion for 180 days, two of the corroded columns were protected by impressed current cathodic protection (ICCP), while the other six corroded columns were further repaired by structural strengthening (SS). A combination of ICCP and SS, namely ICCP-SS, is adopted in this study, which adopts the carbon-fabric reinforced cementitious matrix (C-FRCM) as anode and strengthening material. Finally, specimens were cyclically loaded in a horizontal direction under different axial loads. The results indicated loadcarrying and energy dissipation capacities of specimens were deteriorated due to corrosion. This phenomenon is severer under higher axial load. The dual function of ICCP-SS technique does not only improve load-carrying and energy dissipation capacities of RC columns, but also reduce the on-going corrosion of steel re-bars. These benefits can be attributed to the confinement effect to the column base provided by the C-FRCM composites and the ICCP effect using carbon fabric mesh in the C-FRCM composites as anode.