FRP-confined concrete in square columns: An advanced stressstrain model based on a new approach

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8 Citations (Scopus)


It is well-known that the strength and ductility of reinforced concrete (RC) columns can be significantly enhanced through lateral confinement with fiber reinforced polymer (FRP) jackets. As a result, extensive research has been conducted on the behavior of FRP-confined concrete in both circular and rectangular RC columns. For the former columns, the stress-strain behavior is now well understood and can be closely predicted by some of the existing models, but the same cannot be said about the latter columns. This paper presents a new attempt at understanding and modeling the confinement mechanism in square columns as a special case of rectangular columns, leading to a new stress-strain model. The salient features of the new model include a more rigorous definition of the effective confinement area and a corner hoop strain-axial strain relationship based on advanced finite element results as well as a more reliable definition of the ultimate condition based on experimental results. The proposed model is analogous in approach to analysis-oriented stress-strain models for FRP-confined concrete in circular columns, and represents a more advanced and robust method for modeling the stress-strain behavior of FRP-confined concrete in square columns than the existing stress-strain models for such columns which have normally been empirically based. The approach is believed to be easily extendable to FRP-confined concrete in rectangular columns.
Original languageEnglish
Title of host publicationProceedings of the 4th Asia-Pacific Conference on FRP in Structures, APFIS 2013
PublisherInternational Institute for FRP in Construction (IIFC)
ISBN (Electronic)9780987593016
Publication statusPublished - 1 Jan 2013
Event4th Asia-Pacific Conference on FRP in Structures, APFIS 2013 - Melbourne, Australia
Duration: 11 Dec 201313 Dec 2013


Conference4th Asia-Pacific Conference on FRP in Structures, APFIS 2013


  • FE analysis
  • FRP
  • Square columns
  • Stress distributions
  • Stress-strain models

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Materials Science(all)

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