Fiber-Reinforced Polymer Anchoring System for Structural Retrofit
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Solution Overview
Problem
Older buildings and structures often lack adequate reinforcement to meet current structural demands, necessitating retrofit solutions to enhance their strength and compliance with modern codes.
Innovation Solution
A fiber-reinforced polymer anchoring system comprising a fiber-reinforced polymer member and an anchoring device with a metallic layer, a fiber-reinforced polymer layer, and fastening means to secure the system to structural elements, providing external tensile reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional rebar reinforcement is used in older buildings, then structural capacity can be increased, but the buildings require demolition and reconstruction which is costly and time-consuming
Solution Approach 1:
The reinforcement system is segmented into discrete fiber-reinforced polymer strips that can be independently installed on existing structural elements. Each strip acts as an independent reinforcement unit that can be applied to specific locations needing strengthening, rather than requiring complete structural demolition and reconstruction with traditional rebar.
Solution Approach 2:
The fiber-reinforced polymer strips serve as an intermediary reinforcement layer between the existing concrete substrate and the structural load. These strips bond to the existing concrete surface through adhesive, providing tensile reinforcement without requiring internal access to the concrete or demolition of the original structure.
2Strength
If external reinforcement systems are applied to existing structures, then structural strength can be enhanced, but the bonding interface between reinforcement and substrate may fail under load
Solution Approach 1:
The anchoring device uses a composite construction with a metallic layer providing mechanical anchorage and a fiber-reinforced polymer layer providing chemical bonding. This composite structure combines the advantages of both materials: the metal embeds into the substrate for mechanical interlock while the polymer layer bonds to both the metal and the concrete surface, creating a reliable transition zone that distributes stresses and prevents interface failure.
Solution Approach 2:
The anchoring device changes the physical parameters of the bonding interface by transitioning from a single-material bond to a multi-layer composite interface. The gradual transition from metal to polymer to concrete creates a gradient in material properties, allowing stress distribution and reducing the risk of sudden bond failure at any single interface.
3Adaptability or versatility
If fiber-reinforced polymer strips are used for reinforcement, then structural retrofit can be performed on existing buildings, but the strips require effective anchoring to transfer loads efficiently
Solution Approach 1:
The anchoring device merges multiple anchoring mechanisms into a single integrated component: mechanical embedment of the metallic layer into the substrate, chemical bonding through the fiber-reinforced polymer layer, and direct attachment to the fiber-reinforced polymer strip. This combination of mechanisms in one device simplifies the overall system while improving anchoring effectiveness.
Solution Approach 2:
The anchoring device is designed with multi-functionality to handle various loading conditions and substrate types. The metallic layer can be embedded in different ways (drilled holes, surface mounting), the polymer layer adapts to different concrete surfaces, and the device can anchor strips of various orientations and locations, making the system universally applicable to different retrofit scenarios.
Data Source
AI summary
A fiber-reinforced polymer anchoring system for a structural element includes a fiber-reinforced polymer member configured to provide external tensile reinforcement to the structural element; an anchoring device coupled with the fiber-reinforced polymer member and the structural element; wherein the anchoring device includes a metallic layer, a fiber-reinforced polymer layer, and a fastener for securing the anchoring device on the fiber-reinforced polymer member and the structural element.