FRP bars are made from fibres and resin using a pultrusion method. The mechanical properties of FRP bars depend on type of fibre, resin and the proportion of those two in the material. Therefore the strength of FRP bars varies from manufacturer to manufacturer since different manufacturer use different type of fibres, resins and compositions. Despite the different strengths and modulus of elasticity, all FRP bars share some common attributes and behaviours.
* FRP bars are brittle in nature
* Modulus of Elasticity of any FRP bars is lower compared to steel. In general glass FRP has
* Modulus of Elasticity of any FRP bars is lower compared to steel. In general glass FRP has
25% and Carbon FRP has 75% of modulus elasticity of steel.
*FRP bars cannot be bent on site, so should be customised in the factory.
*FRP bars cannot be bent on site, so should be customised in the factory.
The typical stress strain curves for Glass Fibre Reinforced Plastic (GFRP), Carbon Fibre Reinforced Plastic (CFRP) and Aramid Fibre Reinforced Plastic (AFRP) is shown in Figure 1.
Figure 1: Typical Stress-Strain behaviour of different FRP materials and Steel (Lees, J.M and Burgoyne, C.J., 1999).
Among these three FRP types, GFRP has the lowest modulus of elasticity and CFRP has the highest modulus of Elasticity. However, CFRP is ten times more expensive than GFRP, so industry prefers GFRP bars/rods (Hughes Brothers, 2008).
FRP Rebar Manufacturers on both CFRP and GFRP:
Schoeck Combar : A specialist GFRP rebar manufacturer http://www.schoeck-combar.com/
Pultrall : A Canadian rebar manufacturer : http://www.pultrall.com/Site2008/eng/V-ROD.htm
Hughes Brothers: An American manufacturer :http://www.hughesbros.com/Aslan_FRP.html
1 comment:
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