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Technical Analysis of Carbon Fiber Fabric Reinforcement for Load-Bearing Beams

发布时间：2026-07-31

Author: Internet

The core principle of reinforcing load-bearing beams with carbon‑fiber fabric is to harness the synergistic action between the high‑strength carbon‑fiber material and the beam itself, thereby enhancing the original concrete beam’s flexural and shear capacities and improving its load‑carrying capacity and durability.

　　I. Core Reinforcement Principle

　　 The core principle of reinforcing load-bearing beams with carbon‑fiber fabric is to harness the synergistic action of high‑strength carbon‑fiber materials and the beam itself, thereby enhancing the original concrete beam’s flexural and shear capacities and improving its load‑carrying capacity and durability.

　　II. Common Issues with Load-Bearing Beams

　　 1. Under the combined effects of long-term loading, environmental corrosion, and other factors, concrete cracking, reinforcement corrosion, and a reduction in load-carrying capacity may occur; 2. Changes in building function or the addition of new loads can result in insufficient beam capacity; 3. Design deficiencies, such as inadequate reinforcement in the original design, must be rectified; 4. The beam’s seismic performance is inadequate.
　　III. Reinforcement Application Technologies
　　Flexural Strengthening (Bottom-Edge Bonding):
　　 When a beam is subjected to bending and tensile stresses in its bottom flange, carbon fiber fabric replaces corroded or insufficiently reinforced tension reinforcement to carry the tensile forces, significantly enhancing the beam’s flexural capacity—by as much as 40%.

　　Shear Strengthening (U‑shaped Stirrups or Strips on Beam Sides)
　　 Carbon‑fiber fabric strips are bonded perpendicularly or at an angle to both sides of the beam, acting as “stirrups” to restrain concrete cracking, inhibit the propagation of diagonal cracks, and significantly enhance shear capacity.

　　Confined concrete:
　　 The U-shaped confinement creates a “confinement effect,” delaying concrete crushing and enhancing the beam’s ductility and deformation capacity.

　　 Carbon fiber fabric has a thickness of 0.1–0.3 mm and, after reinforcement, virtually does not increase the structure’s self-weight or cross-sectional dimensions. Its tensile strength is ≥3500 MPa, approximately ten times that of conventional steel. As light as a cicada’s wing, as strong as steel. ), with a stable elastic modulus, it provides efficient mechanical support. The material exhibits excellent corrosion resistance, significantly enhancing structural durability; applied via an adhesive bonding process, it is easy to install, shortens the construction schedule, and enables rapid reinforcement of load-bearing beams.

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