© 2012-2018 by B&B FRP MANUFACTURING INC. IT DEPARTMENT ALL RIGHTS RESERVED

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FREQUENTLY ASKED QUESTIONS ABOUT Engineering & Design of MST-BAR® & MFX-BAR®

Q: Can we replace GFRP rebar in ONE to ONE ratio of Steel bar?

A:  GFRP rebar is two times stronger, but more flexible than steel rebar and it behave linear elastic to failure, therefore       there is no yield point to be determined. Engineers must follow the Codes and Standard for GFRP rebar and not                 Steel. If you have your steel design available, we can help you to change it to GFRP.  

 

Q: What is the difference between GRADE I, GRADE II and GRADE III GFRP Rebar?

A:  Both MST-BAR® & MFX-BAR® are considered as GRADE III according to CSA, Grade refers to modulus of elasticity   of GFRP rebar.

  • GRADE I   - E > 40GPa

  • GRADE II  - E > 50GPa

  • GRADE III - E > 60GPa

 

Q: Can we use GFRP rebar in active seismic regions(earthquake)?

A:  YES, GFRP bars can be used as reinforcement in concrete subjected to seismic loading conditions. The GFRP bars     are capable of resisting reversal tension-compression cycles without failure. The large deformation, exhibited by                 GFRP material, allows the GFRP reinforced building to adequately dissipate the seismic energy. Currently more than         100 bridges and structures are reinforced with GFRP rebar in seismic reigons.

 

Q: What design guidelines should designer follow?

A:  There are number of design guidelines available from CSA & ACI. 

Canada

  • CSA

  • CAN/CSA-S6-06(Canadian highway bridge design code)

  • CAN/CSA-S806-02(Design and construction of building component with FRP)

ISIS

  • Design Manual NO.3 (reinforcement concrete structure with FRP)

  • Design Manual NO.5 (Prestressing concrete structure with FRP )

USA

  • ACI

  • ACI 440.1R-06

  • ACI 440R-07

  • ACI 440.5-08

  • ACI 440.6-08

  • AASHTO GFRP-1