Structural Strengthening Systems

Structural Strengthening Systems

1. Introduction

Used to increase the load-bearing capacity of structural elements without increasing dimensions.

Mainly based on fiber-reinforced polymer systems or steel plates bonded with epoxy.

2. Types

System
Description
Applications
CFRP (Carbon Fiber Reinforced Polymer)
High strength-to-weight ratio; epoxy-saturated carbon fiber sheets or plates.
Columns, slabs, beams (bending, shear, axial).
GFRP (Glass Fiber)
Economical, used for non-structural upgrades.
Walls, facades, aesthetic retrofits.
Steel Plate Bonding
Steel plates bonded using epoxy adhesives.
Bridges, heavy beams.
Anchorage / Wrap Kits
Corner radius wraps, epoxy saturants, primers.
Seismic retrofit, confinement.

3. Standards & Performance

Standard
Reference
ACI 440.2R
Design & application of FRP systems
EN 1504-9
Strengthening systems
IS 15988
Seismic evaluation & retrofit
  1. Performance Parameters
Property
Value
Tensile Strength (CFRP)
3500–5000 MPa
Elastic Modulus
150–230 GPa
Bond Strength
≥2.0 MPa
Elongation
1.5–2.0%
  1. Consultant Guidance
  • CFRP for lightweight, high-strength retrofitting.
  • GFRP for cost-effective secondary applications.
  • RC jacketing for large structural reinforcement.
  • Ensure proper surface preparation (grit blasting, cleaning).