FRP Tendon Anchorage Device with Converging Pressure Surface
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Solution Overview
Problem
Anchoring devices for FRP tendons in concrete structures face premature failure due to high principal stresses caused by mechanical clamping, which is difficult to manage effectively with existing methods.
Innovation Solution
An anchoring device with a tendon pressure contact surface that converges from the proximal portion towards the distal ends, reducing compressive forces and principal stresses by varying the distance between the contact surface and the core plane, thereby minimizing tendon rupture risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mechanical clamping is used to anchor FRP tendons, then anchoring strength is improved, but high principal stresses cause premature tendon failure
Solution Approach 1:
The patent applies local quality by varying the distance between the tendon pressure contact surface and the core plane along the longitudinal direction. The distal end has a larger distance to reduce compressive forces and principal stresses, while the proximal end has a smaller distance for stronger anchoring. This non-uniform distribution optimizes both anchoring strength and tendon reliability at different locations.
2Reliability
If bolts at the distal end are tightened less to reduce compressive forces, then tendon principal stresses are reduced, but the method is difficult to manage in a controlled way
Solution Approach 1:
The patent implements preliminary action by pre-designing the specific geometry of the tendon pressure contact surface with predetermined varying distances from the core plane. This eliminates the need for complex bolt tightening control during installation, as the stress distribution is already optimized by the manufactured shape, making the process easier to manage while maintaining tendon reliability.
3Strength
If a plate-shaped anchor is used to clamp tendons, then anchoring capability is improved, but construction complexity increases due to bolt force variation requirements
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the anchoring device - specifically the distance between the tendon pressure contact surface and the core plane along the longitudinal direction. This geometric parameter variation achieves different compression force distributions without requiring complex bolt force control procedures, thereby improving anchoring capability while keeping construction simple.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces the risk of tendon rupture by distributing pressure more evenly along the anchoring device, providing a controlled grip and minimizing high principal stresses at the loaded end.
Implementation Method 1
The anchoring devices typically anchor the steel or FRP tendons mechanically by using pressure and friction.
Implementation Method 2
The anchoring devices typically anchor the steel or FRP tendons mechanically by using pressure and friction.
Data Source
AI summary
An anchoring device configured for anchoring tendons for structural reinforcing a structure. The anchoring device includes fastening means configured for fastening the anchoring device to the structure, and a tendon pressure contact surface configured for being pressed against a surface of the tendon to be anchored. The tendon defines a reference plane, and anchoring device defines first and second distal end spaced apart from each other in a longitudinal direction. The anchoring device further includes a proximal portion located between the first and second distal ends. The anchoring device defines a core plane extending parallel to the reference plane. The tendon pressure contact surface extends in the longitudinal direction of the anchoring device from the first distal end to the proximal portion. The tendon pressure contact surface converges in the longitudinal direction of the anchoring device from the proximal portion towards the first distal end in the direction towards the core plane, such that the distance between the tendon pressure contact surface and the core plane varies along the longitudinal direction of the anchoring device. The distance increases from the first distal end towards the proximal portion of the anchoring device.