Title

Axial compressive behaviour of CFFT columns without and with steel fibres

RIS ID

141065

Publication Details

Khan, Q., Tinker, J., Sheikh, M. & Hadi, M. (2018). Axial compressive behaviour of CFFT columns without and with steel fibres. 9th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2018 (pp. 414-421).

Abstract

INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering. All rights reserved. The Concrete Filled Fibre Reinforced Polymer Tube (CFFT) column has emerged as an attractive practical substitute of traditional steel bar Reinforced Concrete (RC) column in harsh, aggressive environments where corrosion of steel reinforcement is the key concern. This experimental study investigates the axial compressive behaviour of RC columns and CFFT columns without and with steel fibres. A total of six columns of 200 - 206 mm diameter and 800 - 812 mm height including an RC column without steel fibres (SR-0), an RC column reinforced with 2% by volume of steel fibres (SR-2.0), a Carbon Fibre Reinforced Polymer (CFRP) CFFT column without steel fibres (CT-0), a CFRP CFFT column reinforced with 2% by volume of steel fibres (CT-2.0), a Glass Fibre Reinforced Polymer (GFRP) CFFT column without steel fibres (GT-0) and a GFRP CFFT column reinforced with 2% by volume of steel fibres (GT-2.0). The axial load-axial deformation (P-δ) behaviour of tested columns showed that CFFT columns without steel fibres carried higher axial loads than RC columns without steel fibres. Similarly, CFFT columns with steel fibres carried higher axial loads than RC columns with steel fibres due to the higher circumferential confinement provided by Fibre Reinforced Polymer (FRP) tubes than steel helix. However, RC columns without and with steel fibres exhibited higher axial deformations than CFFT columns without and with steel fibres as FRP reinforcement is a linear elastic material and exhibits a brittle failure. The addition of steel fibres resulted in higher axial loads and higher axial deformations for RC columns with steel fibres than for RC columns without steel fibres, as steel fibres provided the confinement to the concrete and reduced the crack propagation in concrete. The CFFT columns with steel fibres exhibited higher axial loads and resulted in a less brittle failure than CFFT columns without steel fibres. However, the CFFT columns with steel fibres exhibited lower deformations than CFFT columns without steel fibres.

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