Anchoring System for Pre-Stressed CFRP Cables

Lightweight Composite Reinforcement for Bridge Structures

The anchoring system for pre-stressed CFRP cables provides an effective solution for the strengthening and rehabilitation of concrete bridge structures. Designed for the transfer of prestressing forces from carbon fibre reinforced polymer (CFRP) cables into existing infrastructure, the system combines high-performance composite cables with precision-engineered metallic anchorages.

The CFRP cables provide exceptional tensile strength with minimal additional weight, while the anchorage assembly ensures the safe and efficient transfer of forces into the structure. Together, they offer a lightweight, corrosion-resistant alternative to traditional strengthening methods.

Engineered for Structural Reinforcement

The system consists of a prestressed CFRP cable and anchorage assembly specifically designed for bridge reinforcement applications.

The CFRP cables deliver high tensile performance with very low dead weight, while the anchorage system is optimised to minimise stress concentrations and reduce the risk of cable slippage under long-term loading.

Suitable for both road and railway bridge applications, the system can be configured to meet a wide range of span lengths, loading requirements and reinforcement strategies.

Key Benefits

Increased Load Capacity

Increase the load-bearing capability of existing bridge beams and decks without significantly increasing structural weight.

Reduced Deflection and Cracking

Prestressed CFRP cables help reduce deflection during service and control cracking within tension zones.

Lightweight Solution

Significantly lighter than conventional steel reinforcement systems, simplifying installation and reducing additional structural loads.

Corrosion Resistant

CFRP cables are inherently non-corrosive, helping minimise maintenance requirements and extend service life.

Secure Load Transfer

Specially engineered anchorages are designed to ensure reliable force transfer while limiting stress concentrations and cable movement.

Frequently Asked Questions

What types of structures can the anchoring system be used on?

The anchoring system is primarily designed for the strengthening and rehabilitation of concrete bridge structures, including highway bridges, railway bridges, bridge decks and reinforced concrete beams.

Can the system be used for bridge refurbishment projects?

Yes. The system is well suited to structural rehabilitation, load capacity upgrades and infrastructure life-extension programmes where additional strength and stiffness are required without significantly increasing structural weight.

How is the anchoring system installed?

Installation typically begins with inspection and preparation of the existing structure, followed by the positioning and fixing of the metallic anchorages. CFRP cables are then connected, prestressed to the required design load and securely locked in place before the anchorage areas are protected and sealed.

Does the system require prestressing?

Yes. The CFRP cables are prestressed during installation to achieve the required structural performance. Prestressing forces and cable elongation should be carefully controlled and verified as part of the installation process.

How are the prestressing forces transferred to the structure?

The metallic anchorage assembly is designed to transfer the prestressing forces from the CFRP cables safely into the existing concrete structure while minimising stress concentrations and reducing the risk of cable slippage.

Can the system be configured for different bridge types and spans?

Yes. The cable-anchor system can be configured using different cable diameters, quantities and layouts depending on the bridge geometry, span length, loading requirements and reinforcement objectives.

Are there any special installation requirements?

Installation should always be carried out in accordance with project-specific engineering requirements, approved construction methodologies and applicable structural design standards.

Typical Performance Examples

Road Bridge – Three Lane Configuration (12m Span)

Configuration:
12 × C-31 CFRP cables installed externally beneath the primary beams.

Indicative Performance

Up to 25% increase in load-bearing capacity
Approximately 22% reduction in service deflection
Reduced cracking within tension zones

Railway Bridge (12m Span)

Configuration:
6 × C-25 CFRP cables anchored at each end of the deck and guided beneath the structure.