Experimental and numerical studies on the flexural behaviour of GFRP laminated hybrid-fibre-reinforced concrete (HFRC) b
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TECHNICAL PAPER
Experimental and numerical studies on the flexural behaviour of GFRP laminated hybrid‑fibre‑reinforced concrete (HFRC) beams B. Ramesh1 · S. Eswari1 · T. Sundararajan1 Received: 18 April 2020 / Accepted: 19 September 2020 © Springer Nature Switzerland AG 2020
Abstract The main objective of this paper is to study the structural behaviour of hybrid fibre-reinforced concrete beams strengthened with glass fibre-reinforced polymer (GFRP) laminates. For the above purpose, three distinct groups of beam elements were cast, namely: (1) group A consisting of reinforced concrete (RC) and laminated RC beams, (2) group B consisting of fibre-reinforced concrete (FRC) and laminated FRC beams and (3) group C consisting of hybrid fibre-reinforced concrete (HFRC) and laminated HFRC beams. In beams of group B, basalt fibres were incorporated with a total volume fraction of 1%, whereas in group C beams, polyolefin and basalt fibres in the ratio of 30:70 were used with the total volume fraction of 1%. For lamination, 5-mm-thick GFRP sheet was used at the soffit of the all laminated beams. All the beams were tested under the four-point bending, until failure. The study parameters included evaluation of initial crack load, yield load and ultimate load and their corresponding deflections, ductility and failure modes. From the results, it was observed that the laminated HFRC beams exhibited higher load carrying capacity and larger deformation than the other beams. The ultimate load of laminated RC beam was about 33.44% higher than that of the control beams. The ultimate load of laminated HFRC improved by about 83.04% and 37.16% than the control and laminated RC beam, respectively. The load at FRP debonding initiation for ‘laminated HFRC beam’ is 43.06% higher than the laminated RC beam and 10.34% higher than the ‘laminated FRC beam’. Moreover, a 3-D finite element (FE) technique was adopted to simulate the performance of the beam elements. A fairly similar agreement was reached between the findings of the experimental and FE model results. Keywords Basalt fibres · FRC · FE model · Flexure · GFRP · HFRC · Polyolefin fibres · Ductility
Introduction Need for strengthening of reinforced concrete (RC) structures is becoming more apparent, particularly, when there is an enhancement in peak load, a change in use, degradation problem and some design and/or construction deficiency. Use of externally bonded fibre-reinforced polymer (FRP) sheets/plates/strips/warps is a modern and easy way to strengthen RC beams [1, 2]. Several studies have stated that FRP composites when applied to RC members improve * B. Ramesh [email protected] S. Eswari [email protected] T. Sundararajan [email protected] 1
Department of Civil Engineering, Pondicherry Engineering College, Pondicherry 605 014, India
the performance, durability and cost-effectiveness in rehabilitation [3–5]. Among the all fibres, glass fibres have high-temperature resistance, high strength and low cost, which makes glass fibre-reinforced polymer (GFRP) the most suitable
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