New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps
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 n...
| Main Authors: | , , |
|---|---|
| Format: | Journal Article |
| Published: |
ASCE-AMER SOC CIVIL ENGINEERS
2013
|
| Online Access: | http://hdl.handle.net/20.500.11937/12197 |
| _version_ | 1848748011040014336 |
|---|---|
| author | Hadi, M. Pham, Thong Lei, X. |
| author_facet | Hadi, M. Pham, Thong Lei, X. |
| author_sort | Hadi, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T06:58:15Z |
| format | Journal Article |
| id | curtin-20.500.11937-12197 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:58:15Z |
| publishDate | 2013 |
| publisher | ASCE-AMER SOC CIVIL ENGINEERS |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-121972017-09-13T14:56:51Z New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps Hadi, M. Pham, Thong Lei, X. 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. 2013 Journal Article http://hdl.handle.net/20.500.11937/12197 10.1061/(ASCE)CC.1943-5614.0000335 ASCE-AMER SOC CIVIL ENGINEERS restricted |
| spellingShingle | Hadi, M. Pham, Thong Lei, X. New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps |
| title | New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps |
| title_full | New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps |
| title_fullStr | New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps |
| title_full_unstemmed | New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps |
| title_short | New method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps |
| title_sort | new method of strengthening reinforced concrete square columns by circularizing and wrapping with fiber-reinforced polymer or steel straps |
| url | http://hdl.handle.net/20.500.11937/12197 |