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Flexural strengthening of RC slabs with nonprestressed and prestressed CFRP strips using EBROG method

2020; Elsevier BV; Volume: 201; Linguagem: Inglês

10.1016/j.compositesb.2020.108359

1879-1069

Niloufar Moshiri, Christoph Czaderski, Davood Mostofinejad, Ardalan Hosseini, Khaled Sanginabadi, Matteo Breveglieri, Masoud Motavalli,

Structural Response to Dynamic Loads

This paper proposes a fully nonmetallic system for strengthening RC one-way slabs with prestressed CFRP composites. The flexural behaviors of RC slabs strengthened with nonprestressed and prestressed CFRP strips were compared through four-point bending tests. The externally bonded reinforcement on grooves (EBROG) method was utilized to delay premature debonding of the CFRP composites and was compared with conventional externally bonded reinforcement (EBR). The experimental results indicated a significant enhancement in slabs flexural performance of slabs that were strengthened via the EBROG method and the novel anchorage system. The nonprestressed and prestressed CFRP plates attached using the EBROG method increased the bending capacity by 34% and 77%, respectively, compared with the nonprestressed EBR CFRP plate. Furthermore, the maximum CFRP strain reached 8.9‰ for the nonprestressed EBROG CFRP strip, whereas that for the nonprestressed EBR CFRP strip was only 5.9‰. Thus, the EBROG method delayed CFRP debonding and increased the strain in the reinforcement by 50% compared with the EBR method. In the prestressed CFRP strip, the strain reached 12.4‰ prior to the debonding, confirming the high efficiency of the proposed strengthening system.