Numerical Investigation of FRCM-Strengthened Corroded RC Beams under Cathodic Protection.
Numerical Investigation of FRCM-Strengthened Corroded RC Beams under Cathodic Protection.
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阴极保护下纤维增强水泥基复合材料（FRCM）加固锈蚀钢筋混凝土梁的数值研究
DOI：
10.3390/ma15155334
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发表时间：
2022-08-03
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影响因子：
--
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纤维增强水泥基（FRCM）复合材料在过去的几十年里一直被用来改善钢筋混凝土梁的力学性能受到退化。最近，双功能碳纤维已被探索，以提供结构加固钢筋混凝土梁和阴极保护钢筋。本文研究了钢筋混凝土梁的荷载响应和结构性能受到不同程度的腐蚀，保护的外加电流阴极保护和结构加固的外部粘贴FRCM。建立了外加电流阴极保护和FRCM复合材料加固钢筋混凝土梁的数值模型。根据从文献中收集的实验结果进行验证后，有限元模型，然后用于参数研究。生成了一些数值结果来分析关键参数的影响，包括腐蚀速率，由于阳极酸化的界面结合性能的退化水平，以及端部锚固，然后进行详细的讨论。结果表明，钢筋锈蚀对梁的承载能力有显著影响。将腐蚀率从0增加到40%会使未加固梁的承载能力降低到原始能力的45%。因此，C-FRCM板提供的阴极保护对钢筋很重要，因为它可以避免钢筋横截面积的减少，从而避免梁的主要承载能力。在这项研究中，降解的粘结性能在界面处的碳纤维和水泥基基体由于阳极酸化在外加电流阴极保护也被认为是。结果表明，碳纤维增强混凝土板的粘结强度对梁的承载力影响不大。此外，端部锚固的应用可以显着提高梁的承载力和延性。增强率，如果与没有端部锚固的梁相比，可以达到60%。
Fibric reinforced cementitious matrix (FRCM) composites have been used to improve the mechanical performance of reinforced concrete beams subjected to degradation in the past decades. Recently, dual-functional carbon fibres have been explored to provide both structural strengthening to RC beams and cathodic protection to reinforcement bars. This paper investigates the loading responses and structural behaviour of RC beams subjected to different levels of corrosion, protected by impressed current cathodic protection and structurally strengthened by external bonded FRCM. A numerical model is developed for the corroded RC beams under impressed current cathodic protection and structural strengthening by the FRCM composite. Upon validation against experimental results collected from the literature, the finite element model is then used for parametric study. A number of numerical results are generated to analyse the effects of key parameters, including the corrosion rate, degradation level of interfacial bonding properties due to anode acidification, and end anchorage, followed by detailed discussions. It is found that the significance of the corrosion of steel reinforcement bars significantly affects the load-carrying capacity of the beams. Increasing the corrosion rate from 0 to 40% reduces the load-carrying capacity of un-strengthened beams to 45% of the original capacity. Therefore, the cathodic protection provided by the C-FRCM plate is important to the reinforcement bars as it can avoid the cross-section area reduction of reinforcement bars and, thus, the main loading capacities of the beams. In this study, the degradation of the bonding properties at the interface of carbon fibre and the cementitious matrix due to anode acidification during impressed current cathodic protection is also considered. It is found that the bond strength of the C-FRCM plate has a slight effect on the load-carrying capacity of the beam. In addition, the application of end anchorage can significantly enhance both the load-carrying capacity and ductility of the beams. The rates of enhancement, if compared to the beams with no end anchorage, can reach up to 60%.
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