Advances in concrete construction

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Evaluation of Near Surface Mounted (NSM) FRP technique for strengthening of reinforced concrete slabs

  • Chunwei Zhang (Multidisciplinary Center for Infrastructure Engineering, Shenyang University of Technology) ;
  • M. Abedini (Multidisciplinary Center for Infrastructure Engineering, Shenyang University of Technology)
  • Received : 2022.11.18
  • Accepted : 2024.03.08
  • Published : 2023.10.25
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Abstract

Concrete structures may become vulnerable during their lifetime due to several reasons such as degradation of their material properties; design or construction errors; and environmental damage due to earthquake. These structures should be repaired or strengthened to ensure proper performance for the current service load demands. Several methods have been investigated and applied for the strengthening of reinforced concrete (RC) structures using various materials. Fiber reinforced polymer (FRP) reinforcement is one of the most recent type of material for the strengthening purpose of RC structures. The main objective of the present research is to identify the behavior of reinforced concrete slabs strengthened with FRP bars by using near surface mounted (NSM) technique. Validation study is conducted based on the experimental test available in the literature to investigate the accuracy of finite element models using LS-DYNA to present the behavior of the models. A parametric analysis is conducted on the effect of FRP bar diameters, number of grooves, groove intervals as well as width and height of the grooves on the flexural behavior of strengthened reinforced slabs. Performance of strengthening RC slabs with NSM FRP bars was confirmed by comparing the results of strengthening reinforced slabs with control slab. The numerical results of mid-span deflection and stress time histories were reported. According to the numerical analysis results, the model with three grooves, FRP bar diameter of 10 mm and grooves distances of 100 mm is the most ideal and desirable model in this research. The results demonstrated that strengthening of reinforced concrete slabs using FRP by NSM method will have a significant effect on the performance of the slabs.

Keywords

Acknowledgement

This research is financially supported by the National Natural Science Foundation of China (Grant No. 52361135807), the Ministry of Science and Technology of China (Grant No. 2019YFE0112400), and the Department of Science and Technology of Shandong Province (Grant No. 2021CXGC011204).

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