Deflection Behaviour of Concrete Beams Reinforced with Different Types of GFRP Bars

When glass fibre-reinforced polymer (GFRP) bar splices are used in reinforced concrete sections, they affect the structural performance in two different ways: through the stress concentration in the section, and through the configuration of the GFRP–concrete bond. This study experimentally investigated a new method for increasing the bond strength of a GFRP lap (two GFRP bars connected together) using a carbon fibre-reinforced polymer (CFRP) sheet coated in epoxy resin. A new splicing method was investigated to quantify the effect of the bar surface bond on the development length, with reinforced concrete beams cast with laps in the concrete reinforcing bars at a known bending span length. Specimens were tested in four-point flexure tests to assess the strength capacity and failure mode. The results were summarised and compared within a standard lap made according to the ACI 318 specifications. The new method for splicing was more efficient for GFRP splice laps than the standard lap method. It could also be used for head-to-head reinforcement bar splices with the appropriate CFRP lapping sheets.

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Ductility and moment redistribution capacity of multi-span T-section concrete beams reinforced with GFRP bars

Construction and Building Materials ◽

10.1016/j.conbuildmat.2013.01.014 ◽

2013 ◽

Vol 49 ◽

pp. 949-961 ◽

Cited By ~ 20

Author(s):

Pedro Santos ◽

Gilberto Laranja ◽

Paulo M. França ◽

João R. Correia

Keyword(s):

Concrete Beams ◽

Moment Redistribution ◽

Gfrp Bars

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Preparation and characterization of glass fibers – polymers (epoxy) bars (GFRP) reinforced concrete for structural applications

Selected Scientific Papers - Journal of Civil Engineering ◽

10.1515/sspjce-2016-0002 ◽

2016 ◽

Vol 11 (1) ◽

pp. 15-22

Author(s):

Saeed Alkjk ◽

Rafee Jabra ◽

Salem Alkhater

Keyword(s):

Tensile Strength ◽

Reinforced Concrete ◽

Concrete Beams ◽

Glass Fibers ◽

Reinforce Concrete ◽

Experimental Program ◽

Gfrp Bars ◽

Structural Applications ◽

Steel Bars ◽

Deflection Test

Abstract The paper presents some of the results from a large experimental program undertaken at the Department of Civil Engineering of Damascus University. The project aims to study the ability to reinforce and strengthen the concrete by bars from Epoxy polymer reinforced with glass fibers (GFRP) and compared with reinforce concrete by steel bars in terms of mechanical properties. Five diameters of GFRP bars, and steel bars (4mm, 6mm, 8mm, 10mm, 12mm) tested on tensile strength tests. The test shown that GFRP bars need tensile strength more than steel bars. The concrete beams measuring (15cm wide × 15cm deep × and 70cm long) reinforced by GFRP with 0.5 vol.% ratio, then the concrete beams reinforced by steel with 0.89 vol.% ratio. The concrete beams tested on deflection test. The test shown that beams which reinforced by GFRP has higher deflection resistance, than beams which reinforced by steel. Which give more advantage to reinforced concrete by GFRP.

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