Flexural and Plastic Hinge Behaviour of GFRP Confined FRC Beams

Abstract:

In this investigation, it was planned to study the flexural and plastic hinge behaviour of reinforced concrete beams confined with GFRP wraps and polyolefin fiber addition in critical regions (plastic hinge zone) along with stirrup confinement. The variables are the number of layers and chopped/woven type of wrapping, which controls the behaviour of the GFRP, and the percentage of polyolefin addition. The programme consisted of casting and testing 20 rectangular reinforced concrete beams of the size of 150 mm × 230 mm × 2000 mm, under a symmetrical two point loading. During the casting of the beams, the middle one third 600mm of the beams were cast with polyolefin fibers concrete, of volume fractions 0.3%, 0.5%,0.7%,0.9% and 1.2%. After the curing of the beams, glass fiber mats along with polyester resin were wrapped over the beams in the plastic hinge zone (critical zone) for 600 mm length; i.e., 300 mm from the centre on each side. Polyolefin fiber addition to the lateral tie and GFRP confined beams has the advantage over the confinement by the lateral ties and FRP wrap in improving the performance under large deformations.

• Periodical: Advanced Materials Research (Volumes 838-841)
• Pages: 448-453
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.838-841.448
• Online since: November 2013
• Authors: S. Palanivel, M. Sekar
• Keywords: Confined Fibre Reinforced Concrete, Flexural Behavior, Load– Deflection Relationship, Moment-Curvature Relationship, Polyolefin Fibre Concrete, Synthetic Fibre Concrete

References

[1] Seshu D.R., Flexural behavior of ferrocement confined reinforced concrete (FCRC) simply supported beams, Journal of Ferrocement, Vol 30, N0. 3, July (2000).

[2] M. Srikanth et al, Moment curvature of reinforced concrete beams using various confinement models and experimental validation, Asian journal of civil engineering (building and housing) vol. 8, no. 3 (2007) pages 247-265.

[3] Byung Hwan Oh et al, Experimental and theoretical investigation on the postcracking inelastic behavior of synthetic fiber reinforced concrete beams, Cement and Concrete Research 35 (2005) 384- 392.

DOI: 10.1016/j.cemconres.2004.07.019

[4] Palanivel, S., and M. Sekar. Experimental and Numerical Investigation on Stress-Strain Relationships of GFRP and Lateral Ties Confined Polyolefin Fibre Reinforced Concrete under Monotonic Axial Compression., Applied Mechanics and Materials 253 (2013).

DOI: 10.4028/www.scientific.net/amm.253-255.466

[5] Palanivel, S., and M. Sekar. Constitutive Behaviour of Lateral Ties Confined Polyolefin Fibre Reinforced Concrete under Monotonic Axial Compression., Applied Mechanics and Materials 253 (2013): 367-375.

DOI: 10.4028/www.scientific.net/amm.253-255.367

[6] Palanivel, S., and M. Sekar. Cyclic Behaviour of GFRP and Lateral Ties Confined Polyolefin Fibre Reinforced Concrete under Axial Repeated Compression., Applied Mechanics and Materials 275 (2013): 1330-1334.

DOI: 10.4028/www.scientific.net/amm.275-277.1330

[7] Palanivel, S., and M. Sekar. Cyclic Behaviour of Lateral Ties Confined Polyolefin Fibre Reinforced Concrete under Repeated Axial Compression., Applied Mechanics and Materials 253 (2013): 537-541.

DOI: 10.4028/www.scientific.net/amm.253-255.537