Research on Anchorage of GFRP Anchor Bolts and Heads

Abstract

GFRP is an abbreviation of Glass Fiber Reinforced Polymer. It is an inorganic non-metallic material made of glass fiber reinforced material, synthetic resin as matrix material, and compounded by a certain process. Although the glass fiber reinforced polymer anchor can fundamentally solve the problem of poor corrosion resistance of the steel bar anchor, in the anchor system, the force on the surface layer or the waist beam needs to be transmitted to the shaft through the anchor head. At present, the pull-out strength of domestic GFRP anchors is far away from the tensile strength of GFRP tendons. This may cause the anchorage system of anchors to fail due to anchorage failure, and the tensile strength of GFRP tendons cannot be fully exerted. When ordinary clip-type anchorages are used, there is a huge clamping force on the ribs in the anchorage zone, which may result in the shear failure of ribs.Based on this, this article uses a high-strength impregnated reinforcement material to carry out the tensile failure test of a GFRP anchored anchorage with a diameter of 18cm. The study found that the use of high-strength reinforced concrete can make the GFRP anchor achieve the maximum tensile strength, and with the increase of curing time, the ability of the high-strength reinforcement to limit the displacement of the anchorage end is stronger.