Simpson Strong-Tie Composite Strengthening Systems (CSS) provide efficient fibre reinforced polymer (FRP) solutions for the structural reinforcement and strengthening of concrete, masonry and timber structures in need of repair or upgrade. The CSS are designed, tested and manufactured to offer high-performance solutions and lasting results.

Fibre Reinforced Polymer (FRP) Systems are simply defined as high-strength and lightweight reinforcements created by combining carbon (CFRP) or E-glass fibres with a polymer material. The performance characteristics of FRP strengthening have become increasingly popular in construction and retrofit applications, specifically in ageing, damaged or overloaded concrete structures.

The primary benefit of FRP systems versus traditional retrofit methods is that significant flexural, axial or shear strength gains can be realised with an easy-to-apply composite that does not add significant weight or mass to the structure.

Steel plate bonding, concrete section enlargement and steel jacketing have been the renovation methods of choice for decades, yet corrosion, bond degradation and installation difficulty are consistent challenges to overcome, and the resultant retrofit generally adds weight, reduces usable space, clearance, or both.

There are three common scenarios where FRP has proven to be more economical than traditional strengthening methods:

• Increases to a structure’s load capacity beyond the original specification or expectation
• Seismic strengthening
• Repairs to concrete structures that become damaged over time