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The Solution for Corrosion....

Design With V-Rod

Designing with V-ROD is slightly different than designing with steel. Here are the differences:

  • FRP Reinforcing bars have high strength but low modulus of elasticity compared to steel.
  • The design of concrete elements reinforced with FRP bars is governed by serviceability requirements: Deflection and crack width.
  • FRP reinforced concrete elements should be designed as over-reinforced sections.
  • Material resistance factors similar to those used for conventional steel reinforced concrete elements taking into account the durability issues.
  • Design equations for flexture and shear are introduced in these codes and guides (CAN/CSA-S6; CAN/CSA-S806; ACI 440. 1R)

 

Flextural Design

Load Factors and Load Combinations

  • Uses the same load factors as in the building code
  • Loan combinations are also the same

Material Resistance factors

  • Concrete and steeel resistance factors remain the same.
  • FRP resistance factor ϕF= 0.65, for FRP reinforced or prestressed.

Serviceability Limit Status

The maximum stress FRP bars or grids under loads at servicability limit state shall not be more than: 0.30 of the chartacteristic tensile strength.

Cracking - FRP RC

  • No need to control crack width to prevent corrosion.
  • Crack width needs to be prevented from an aesthetic point of view and to control stresses in reinforcement.

In steel reinforced concrete, it is necessary to reduce the crack width in order to inhibit the corrosion of steel reinforcement.

This is not a requirement with FRP reinforced concrete due to excellent corrosion resistance of FRP materials.

Specifically, limits crack width for FRP reinforced componenets to 0.5 mm (0.020 in) for aggressive environbments and 0.7 mm (0.028 in) for other appliacations.

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