Axial performance of hollow concrete columns reinforced with GFRP composite bars with different reinforcement ratios

Alajarmeh, Omar S. and Manalo, Allan C. and Benmokrane, Brahim and Karunasena, Warna and Mendis, Priyan (2019) Axial performance of hollow concrete columns reinforced with GFRP composite bars with different reinforcement ratios. Composite Structures, 213 (1). pp. 153-164. ISSN 0263-8223

Abstract

A hollow concrete column (HCC) is a structurally efficient construction system and uses less material. Conventionally, HCCs are reinforced with steel bars, which are prone to corrosion. This study explored the use of glass-fiber-reinforced-polymer (GFRP) composite bars as reinforcement for HCCs and evaluated the effect of the reinforcement ratio on HCC structural behavior. A total of six HCCs reinforced longitudinally with GFRP bars with different reinforcement ratios (1.78%, 1.86%, 2.67%, 2.79%, 3.72, and 4.00%) were prepared and their behavior was investigated. The different reinforcement ratios were achieved by changing the bar diameter (12.7 mm, 15.9 mm, and 19.1 mm) and number of bars (4, 6, 8, and 9 bars). The results show that increasing the diameter and number of bars enhanced the strength, ductility and confinement efficiency of HCC. For columns with equal reinforcement ratios, using more and smaller-diameter GFRP bars yielded 12% higher confinement efficiency than in the columns with fewer and larger-diameter bars. The crushing strain of the GFRP bars embedded the HCC was 52.1% of the ultimate tensile strain. Lastly, the axial-load capacity of the GFRP-reinforced HCC can be reliably predicted by considering the contribution of the concrete and up to 3000 με in the longitudinal
reinforcement.


Statistics for USQ ePrint 35710
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 July 2013 -)
Date Deposited: 16 Dec 2019 05:09
Last Modified: 17 Jan 2020 02:39
Uncontrolled Keywords: hollow columns; GFRP composite bars; reinforcement ratio; bar diameter; number of bars; crushing strain
Fields of Research : 12 Built Environment and Design > 1204 Engineering Design > 120402 Engineering Design Knowledge
Identification Number or DOI: 10.1016/j.compstruct.2019.01.096
URI: http://eprints.usq.edu.au/id/eprint/35710

Actions (login required)

View Item Archive Repository Staff Only