Axial behavior of square reinforced concrete columns strengthened with lightweight concrete elements and unbonded GFRP wrapping

Andrin Herwig, Masoud Motavalli

Research output: Contribution to journalArticleResearchpeer-review

20 Citations (Scopus)


This paper presents a new, efficient, and economic confinement technique for square reinforced concrete (RC) columns with unbonded glass fiber-reinforced polymer (GFRP) wrapping and lightweight concrete elements at the side faces. Three confined columns with different reinforcement ratios were tested under concentric axial force. The force-deformation responses show a distinctly increased load-carrying capacity at plastic deformations up to 4% average axial strain. This confinement technique is a considerable improvement for square columns with a large side-to-corner radius. Only a slight change in column geometry has to be accepted because of the use of unbonded lightweight concrete panels.

Original languageEnglish
Pages (from-to)747-752
Number of pages6
JournalJournal of Composites for Construction
Issue number6
Publication statusPublished - 1 Dec 2012
Externally publishedYes


  • Ductility
  • GFRP
  • Square columns
  • Unbonded confinement

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