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Civil structures are affected by many different factors from the environment, loads, aging of materials, … These factors are uncertain variables and affect the health of the structures. Therefore, structural health monitoring (SHM) is very essential to detect damages early for necessary maintenance. In this paper, damaged locations in reinforced concrete beams strengthened with FRP (Fiber Reinforced Polymer) sheets are identified by using the modal strain energy method. First, a reinforced concrete beam strengthened with FRP sheets is simulated by ANSYS APDL software in order to analyze the beam’s behavior and get vibration responses. The reliability of the simulation is verified by comparing the load - displacement relationship between numerical and experimental results. Next, the modal strain energy method is employed to determine the damaged locations (crack and debonding) in the beam. In which, a set of indicators to evaluate the accuracy of damage localization results is proposed. The feasibility of the method is demonstrated through two problems. For problem 1, five different damage scenarios including concrete damage and FRP debonding are examined to evaluate the modal strain energy method’s feasibility for damage detection in the target beam. For problem 2, damages occurring in the beams are analyzed and determined according to each load level corresponding to the real working of the target beam. The results show that the modal strain energy method has high accuracy in detecting and locating damages in reinforced concrete beams strengthened with FRP sheets.

Author's Affiliation
  • Mạnh Hùng Trần

    Google Scholar Pubmed

  • Minh Nhân Phạm

    Google Scholar Pubmed

  • Hữu Phương Nguyễn

    Google Scholar Pubmed

  • Đệ Nhất Trương Trần

    Google Scholar Pubmed

  • Chí Thiện Nguyễn

    Google Scholar Pubmed

  • Minh Tuấn Hà

    Google Scholar Pubmed

  • Duc-Duy Ho

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    Google Scholar Pubmed

Article Details

Issue: Vol 5 No 2 (2022)
Page No.: 1508-1519
Published: Jun 30, 2022
Section: Research article

 Copyright Info

Creative Commons License

Copyright: The Authors. This is an open access article distributed under the terms of the Creative Commons Attribution License CC-BY 4.0., which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 How to Cite
Trần, M. H., Phạm, M. N., Nguyễn, H. P., Trương Trần, Đệ N., Nguyễn, C. T., Hà, M. T., & Ho, D.-D. (2022). Damage localization in reinforced concrete beams strengthened with FRP sheets using modal strain energy method. VNUHCM Journal of Engineering and Technology, 5(2), 1508-1519.

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