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New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps

Journal Article


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Abstract


  • This study investigates three methods of strengthening existing reinforced square concrete columns under different loading

    conditions. Four groups of sixteen reinforced concrete square columns were made from normal-strength concrete. Reinforcement was kept at minimum ratio, simulating columns that need retrofitting. Columns of the first group were reference columns (Group N), while the corners of the second group columns (Group RF) were rounded and wrapped with three layers of carbon-fiber-reinforced polymers (CFRPs). The sides of the columns of the third group (Group CF) were bonded with four pieces of concrete with a segmental circular shape, thus changing the cross section of the column from a square to a circle before each column was wrapped with three layers of CFRP. The columns of the last group (fourth) were modified as the third group to result in a circular cross section, but were confined with steel straps. Results from the study showed that all confinement methods increased the capacity and ductility of columns. In particular, segmental circular concrete covers dramatically reduced the stress concentration at the corners and increased confinement efficacy. The interaction (P–M) diagrams of experimental results and theoretical analysis all confirmed high performance of groups RF and CF.

UOW Authors


  •   Hadi, Muhammad
  •   Pham, Thong m. (external author)
  •   Lei, Xu (external author)

Publication Date


  • 2013

Citation


  • Hadi, M. N. S., Pham, T. M. & Lei, X. (2013). New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps. Journal of Composites for Construction, 17 (2), 229-238.

Scopus Eid


  • 2-s2.0-84875033410

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1472&context=eispapers&unstamped=1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/467

Has Global Citation Frequency


Number Of Pages


  • 9

Start Page


  • 229

End Page


  • 238

Volume


  • 17

Issue


  • 2

Place Of Publication


  • United States

Abstract


  • This study investigates three methods of strengthening existing reinforced square concrete columns under different loading

    conditions. Four groups of sixteen reinforced concrete square columns were made from normal-strength concrete. Reinforcement was kept at minimum ratio, simulating columns that need retrofitting. Columns of the first group were reference columns (Group N), while the corners of the second group columns (Group RF) were rounded and wrapped with three layers of carbon-fiber-reinforced polymers (CFRPs). The sides of the columns of the third group (Group CF) were bonded with four pieces of concrete with a segmental circular shape, thus changing the cross section of the column from a square to a circle before each column was wrapped with three layers of CFRP. The columns of the last group (fourth) were modified as the third group to result in a circular cross section, but were confined with steel straps. Results from the study showed that all confinement methods increased the capacity and ductility of columns. In particular, segmental circular concrete covers dramatically reduced the stress concentration at the corners and increased confinement efficacy. The interaction (P–M) diagrams of experimental results and theoretical analysis all confirmed high performance of groups RF and CF.

UOW Authors


  •   Hadi, Muhammad
  •   Pham, Thong m. (external author)
  •   Lei, Xu (external author)

Publication Date


  • 2013

Citation


  • Hadi, M. N. S., Pham, T. M. & Lei, X. (2013). New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps. Journal of Composites for Construction, 17 (2), 229-238.

Scopus Eid


  • 2-s2.0-84875033410

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1472&context=eispapers&unstamped=1

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/467

Has Global Citation Frequency


Number Of Pages


  • 9

Start Page


  • 229

End Page


  • 238

Volume


  • 17

Issue


  • 2

Place Of Publication


  • United States