Failure-mode analysis of macro-synthetic and hybrid fibre-reinforced concrete beams with GFRP bars using acoustic emission technique

Dev, Amal and Chellapandian, M. and Prakash, S. Suriya and Kawasaki, Yuma (2020) Failure-mode analysis of macro-synthetic and hybrid fibre-reinforced concrete beams with GFRP bars using acoustic emission technique. Construction and Building Materials, 249. p. 118737. ISSN 09500618 (In Press)

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Replacement of steel rebars with fibre-reinforced polymer (FRP) bars in concrete members has become prominent in recent years to avoid the corrosion issues. To improve the shear behaviour of glass FRP (GFRP) bars reinforced concrete (RC), macro-synthetic polyolefin (PO) fibres and a hybrid combination of PO with steel fibres are added. The influence of these fibres on the failure mode of GFRP beams are studied by applying acoustic emission (AE) technique. Seven full-scale GFRP-RC beams are cast by varying fibre dosages of 0.35%, 0.70% and 1.0% by the volume of concrete and tested under three-point bending with the shear span to effective depth ratio (a/d) of 2.2. Experimental results reveal that the addition of fibres increases the post-cracking stiffness, peak load and ductility, compared to the control beam. The increase in AE events, average RA values and shear-to-tensile crack-ratios indicate the effects of fibres on improving the shear capacity and ductility of the beams. The failure zones localised by AE events correlate well with crack patterns observed in the experiments. In particular, cracks (AE sources) distribute close to the loading point in the control specimen. The crack angle increases with the increase in fibre dosage, indicating the change in failure modes. With the addition of moderate and high fibre dosages, the failure mode is converted from shear to flexure-shear and flexure respectively, thereby producing more tensile fracture modes.

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IITH Creators:
IITH CreatorsORCiD
Prakash, Suriya SUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Acoustic emission techniques; Failure mode analysis; Fibre reinforced polymer bars; Hybrid fibre reinforced concrete; Reinforced beams; Shear behaviour; Tensile fractures; Three point bending;Acoustic emission testing; Concrete beams and girders; Cracks; Ductility; Failure modes; Fiber reinforced concrete; Fiber reinforced plastics; Polymer concrete; Reinforced concrete; Shear flow; Shotcreting; Steel corrosion; Steel fibers
Subjects: Civil Engineering
Divisions: Department of Civil Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 28 Jul 2021 07:20
Last Modified: 04 Mar 2022 07:20
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