Behaviour of Columns Constructed with Internal FRP Reinforcement Under Axial Loading

Nabi P., Petkova D., Donchev T.

10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), İstanbul, Turkey, 8 - 10 December 2021, vol.198, pp.878-887 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 198
  • Doi Number: 10.1007/978-3-030-88166-5_76
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.878-887
  • Keywords: Reinforced Concrete, Column, Corrosion, FRP, Compression, CONCRETE COLUMNS, BARS
  • Istanbul Technical University Affiliated: No


The internal steel reinforcement in RC structures is susceptible to corrosion due to chemical attacks such as chloride induced corrosion and carbonation. Fibre Reinforced Polymers (FRP) have been studied in the field of civil/structural engineering and it composites the drawbacks connected with steel reinforcement. There are numerous experimental and numerical researches conducted on the use of FRP in flexural RC elements. However, there are insufficient number of studies conducted on the use of FRP reinforcement under compression in elements such as columns. This research examines the performance of RC columns fully internally reinforced with Glass FRP and tested under concentric load. Four half-scale reinforced concrete columns with dimensions of 130 x 130 x 1500 mm were fabricated and tested under compression load. One sample was longitudinally reinforced with steel bars acting as a reference, whilst the other three remaining samples were longitudinally reinforced with GFRP bars. The samples were instrumented with Strain Gauges (SGs) and Linear Variable Differential Transducers (LVDTs) in order to monitor the behaviour of the samples throughout the loading. The result suggests that the structural response of the steel and GFRP reinforced are highly comparable. All the samples failed because of buckling of the columns. The column reinforced with steel displayed 17% higher ultimate capacity compared to the columns reinforced with GFRP. In addition, the column reinforced with GFRP showed relatively higher deformability. The variation in the structural response of the steel and GFRP samples were relatively insignificant.