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Flexural behaviour of reinforced concrete beams repaired using a hybrid scheme with stainless steel rebars and CFRP sheets
Construction and Building Materials ( IF 7.4 ) Pub Date : 2020-08-27 , DOI: 10.1016/j.conbuildmat.2020.120296
Md Abul Hasan , Mitsuyoshi Akiyama , Koya Kashiwagi , Keisuke Kojima , Long Peng

The repair of corroded reinforced concrete (RC) structures is a critical issue for structural designers and managers because the repair cost significantly dominates the life-cycle cost. Moreover, in chloride-containing environments (e.g. coastal environments), RC structures repaired with conventional methods may corrode again since the ingress of chloride ions, water, and oxygen into the concrete will not be completely restrained. In this paper, a novel repair method for corroded RC beams using stainless steel (SS) rebars and externally bonded carbon-fibre-reinforced polymer (CFRP) sheets is proposed. The flexural behaviour of a group of RC beams repaired using the proposed method is experimentally investigated. The test variables include the longitudinal reinforcement types (i.e. carbon and SS), shear reinforcement configurations, and CFRP sheet wrapping schemes. Experimental results demonstrate that a carbon steel (CS) reinforcement can be replaced with an SS reinforcement to reduce future repair costs since there is no significant difference in the flexural behaviour of beams reinforced with CS and SS rebars. The effectiveness of CFRP sheet wrapping schemes on the flexural performances of SS-RC beams is approximately identical to that of CS-RC beams. In addition, the present paper discusses the serviceability and ultimate limit states of RC beams retrofitted with SS rebars and CFRP sheets based on the current design codes for ordinary RC beams strengthened using CFRP sheets. The predictions are in good agreement with the experimental results.



中文翻译:

使用不锈钢钢筋和CFRP板的混合方案修复的钢筋混凝土梁的抗弯性能

对于结构设计者和管理人员而言,腐蚀的钢筋混凝土(RC)结构的修复是至关重要的问题,因为修复成本在很大程度上决定了生命周期成本。此外,在含氯的环境(例如沿海环境)中,用传统方法修复的RC结构可能会再次腐蚀,因为不会完全抑制氯离子,水和氧气进入混凝土。本文提出了一种使用不锈钢(SS)钢筋和外部粘结的碳纤维增强聚合物(CFRP)板修复锈蚀RC梁的新方法。实验研究了使用该方法修复的一组RC梁的抗弯性能。测试变量包括纵向钢筋类型(即碳和SS),抗剪钢筋配置,和CFRP纸包装方案。实验结果表明,碳钢(CS)钢筋可以用SS钢筋代替,以减少未来的维修成本,因为用CS和SS钢筋加固的梁的抗弯性能没有显着差异。CFRP片材包裹方案对SS-RC梁抗弯性能的有效性与CS-RC梁大致相同。此外,本文根据目前使用CFRP加固的普通RC梁的设计规范,讨论了用SS钢筋和CFRP加固的RC梁的使用寿命和极限状态。预测结果与实验结果吻合良好。实验结果表明,碳钢(CS)钢筋可以替换为SS钢筋,以减少未来的维修成本,因为用CS和SS钢筋加固的梁的抗弯性能没有显着差异。CFRP片材包裹方案对SS-RC梁抗弯性能的有效性与CS-RC梁大致相同。此外,本文根据目前使用CFRP加固的普通RC梁的设计规范,讨论了用SS钢筋和CFRP加固的RC梁的使用寿命和极限状态。预测结果与实验结果吻合良好。实验结果表明,碳钢(CS)钢筋可以用SS钢筋代替,以减少未来的维修成本,因为用CS和SS钢筋加固的梁的抗弯性能没有显着差异。CFRP片材包裹方案对SS-RC梁抗弯性能的有效性与CS-RC梁大致相同。此外,本文根据目前使用CFRP加固的普通RC梁的设计规范,讨论了用SS钢筋和CFRP加固的RC梁的使用寿命和极限状态。预测结果与实验结果吻合良好。CFRP片材包裹方案对SS-RC梁抗弯性能的有效性与CS-RC梁大致相同。此外,本文根据目前使用CFRP加固的普通RC梁的设计规范,讨论了用SS钢筋和CFRP加固的RC梁的使用寿命和极限状态。预测结果与实验结果吻合良好。CFRP片材包裹方案对SS-RC梁抗弯性能的有效性与CS-RC梁大致相同。此外,本文根据目前使用CFRP加固的普通RC梁的设计规范,讨论了用SS钢筋和CFRP加固的RC梁的使用寿命和极限状态。预测结果与实验结果吻合良好。

更新日期:2020-08-28
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