Structural Engineering and Mechanics

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Behavior and modeling of RC beams strengthened with NSM-steel technique

  • Md. Akter Hosen (Department of Civil and Environmental Engineering, College of Engineering, Dhofar University) ;
  • Khalid Ahmed Al Kaaf (Department of Civil and Environmental Engineering, College of Engineering, Dhofar University) ;
  • A.B.M. Saiful Islam (Department of Civil & Construction Engineering, Imam Abdulrahman Bin Faisal University) ;
  • Mohd Zamin Jumaat (Department of Civil Engineering, Faculty of Engineering, University of Malaya) ;
  • Zaheer Abbas Kazmi (Department of Civil & Construction Engineering, Imam Abdulrahman Bin Faisal University)
  • Received : 2016.10.18
  • Accepted : 2023.04.27
  • Published : 2023.10.10
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Abstract

The reinforced concrete (RC) structures might need strengthening or upgradation due to adverse environmental conditions, design defects, modification requirements, and to prolong the expected lifespan. The RC beams have been efficiently strengthened using the near surface mounted (NSM) approach over the externally bonded reinforcing (EBR) system. In this study, the performance of RC beam elements strengthened with NSM-steel rebars was investigated using an experimental program and nonlinear finite element modeling (FEM). Nine medium-sized, rectangular cross-section RC beams total in number made up for the experimental evaluation. The beams strengthened with varying percentages of NSM reinforcement, and the number of grooves was assessed in four-point bending experiments up to failure. Based on the experimental evaluation, the load-displacement response, crack features, and failure modes of the strengthened beams were recorded and considered. According to the experimental findings, NSM steel greatly improved the flexural strength (up to about 84%) and stiffness of RC beams. The flexural response of the tested beams was simulated using a 3D non-linear finite element (FE) model. The findings of the experiments and the numerical analysis showed good agreement. The effect of the NSM groove and reinforcement on the structural response was then assessed parametrically.

Keywords

Acknowledgement

The authors express their appreciation for the monetary assistance provided by the University of Malaya High Impact Research Grant, which was assigned Account No UM.C/HIR/MOHE/ENG/36.

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