Assessment of shear capacity in NSM prestressed FRP strengthening with anchorage conditions

Sanghyeon Cho, Wonseok Chung, Woo tai Jung, Jong sup Park, Heeyoung Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Efforts to achieve a defect-free flat groove in near-surface-mounted prestressed fiber-reinforced polymer (FRP) strengthening systems have proven challenging. Despite attempts, attaining an ideal groove remains formidable. In this system, anchorage device installation involves injecting epoxy resin into groove defects to achieve planarity. Structural behavior analysis and optimization of the anchorage device were conducted based on device type, anchor type, and defect depth through shear loading tests. The mechanical anchor demonstrated an ultimate load of 261 kN, with failure modes including concrete cracking, concrete compression failure, and anchor tensile failure. The chemical anchor exhibited an ultimate load of 390 kN, with its final failure attributed to anchor tensile failure. The ultimate load capacity of anchorage device surpassed that of a carbon FRP(CFRP) bar by up to 62.5%. In a parametric study, the shear strength of the anchorage device was explored concerning concrete compressive strength and anchor diameter. The ultimate load of the proposed model with low concrete compressive strength proved insufficient compared to the strength of CFRP rebar.

Original languageEnglish
Article numbere02743
JournalCase Studies in Construction Materials
Volume20
DOIs
Publication statusPublished - Jul 2024

Bibliographical note

Publisher Copyright:
© 2023 The Authors

Keywords

  • Anchorage device
  • Defect depth
  • Finite element analysis
  • Prestressed near-surface-mounted
  • Shear capacity

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