Anchoring method for large tonnage frp cables

Abstract

The invention discloses a large-tonnage FRP stay cable anchoring method. The method comprises steps: forming a taper variable stiffness load transmission medium on a FRP stay cable anchoring region, wherein the variable stiffness load transmission medium being formed by fiber yarns which are winded along a length direction of the FRP stay cable anchoring region in a segmented manner through mouldpressing, heating, and solidifying, using fiber yarns in different kinds in different segments, to form variable stiffness load, the fiber yarns being soaked by resin before being winded; along an axial direction of the variable stiffness load transmission medium, cutting a plurality of kerfs; using a taper anchorage device matched with the taper variable stiffness load transmission medium to anchor. The anchoring method is advantaged by simple manufacturing, easy control, good coordination force property, high anchoring efficiency, continuous variation of load transmission medium stiffness, and more uniform load transmission medium stiffness. Fiber content and transverse stiffness of the variable stiffness load transmission medium gradually increase from a loading end to a free end, to relieve or eliminate notch effect of the loading end of the FRP stay cable, and prevent lateral shearing damages from preceding tensile damages of the large-tonnage FRP stay cable caused by stress concentration.

Description

technical field [0001] The invention relates to a large-tonnage FRP cable anchoring method technology using an integral variable stiffness load transmission medium, and belongs to the technical field of large-tonnage FRP cable anchorage. Background technique [0002] Fiber Reinforced Polymer (FRP) is a new type of composite material formed by a pultrusion process with fiber as a reinforcing material, resin as a matrix material, and auxiliary materials such as sizing agent added. FRP has many excellent properties such as light weight, high strength, corrosion resistance, fatigue resistance and good shock absorption performance. It is an ideal material for replacing steel bars in civil engineering structures. have been applied in other structures. [0003] Fatigue failure of steel cables of long-span bridges, insufficient corrosion resistance, and large sag caused by excessive self-weight have gradually become important factors that endanger the safety and reliability of brid...

AI Technical Summary

Problems solved by technology

When the clip-type anchor is used to anchor the FRP cable, the clip in the anchorage area will produce lateral extrusion deformation on the FRP cable, and stress concentration will appear at the loading end of the clip-type anchor, which will easily cause the transverse shear of the FRP cable. Shear failure precedes tensile failure

[0007] The anchoring methods of large tonnage and small tonnage are different. Since the anchoring force is not large, the conventional anchoring method can be used to achieve anchoring. Using the same anchoring method as that with small tonnage will cause problems such as too long anchorage area, easy damage to FRP tendons, slippage of FRP tendons and transverse shear damage. Anchor method suitable for large tonnage

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