2. STRENGHTENING OF FLEXURAL
MEMBERS USING FRP
SAHILA P T
ROLL.NO:63
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GUIDED BY:
Athira V R
HOD
Dept of Civil Engineering
GPTC,Manandavady
3. • Fibre-reinforced polymer (FRP) is a composite material
made of a polymer matrix reinforced with fibres.
• Fibres usually used are glass, carbon, aramid and basalt.
• Used and accepted world-widely because of the low cost to
performance benefits.
INTRODUCTION
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4. • Tensile strength greater than steel
• 1/4th weight of steel reinforcement
• Impervious to chloride ion and chemical attack
• Electrically and thermally non-conductive
BENEFITS
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5. STRENGTHENING OF
• Flexural members
• Columns
• Slab of buildings and bridges
• Also used for strengthening damaged structural members.
APPLICATIONS
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6. • Experimental program was conducted by Alaa M. Morsy
• He investigate it using embedded Carbon FRP rods(12mm)
• FRP rod was placed through the lower reinforcement
• Also bonded with the stirrups, so that delamination of the FRP rod
was avoided.
FLEXURAL STRENGTHENING OF
BEAMS USING CFRP RODS
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8. • 5 reinforced concrete beams were cast and eight loading
tests were carried out.
• All beams had a cross section of 120 mmx300 mm,
• Total length -2.4 m.
• All beams were designed to fail in a flexural mode.
FLEXURAL STRENGTHENING OF
BEAMS USING CFRP RODS
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9. • For flexure reinforcement,
• 2 reinforcing bars - 12 mm
• high tensile steel were used as lower reinforcement
• Reinforcing bars of 10 mm mild steel were used as upper
reinforcement.
FLEXURAL STRENGTHENING OF
BEAMS USING CFRP RODS
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10. FLEXURAL STRENGTHENING OF
BEAMS USING CFRP RODS
• The shear reinforcement
• consisted of 8 mm stirrups spaced at 100mm
• Shear span and 150mm spacing within the midspan zone
at the position of zero shear.
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13. • The test program conducted by D. H. Tavares
• It includes six reinforced concrete beams
• one control specimen reinforced with steel bars
• Also five reinforced with longitudinal GFRP bars.
• All beams were reinforced with steel stirrups.
FLEXURAL STRENGTHENING OF
BEAMS USING GFRP RODS
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16. • Average longitudinal tensile strains were taken
• It is taken from the average of the strain gauges
• It was placed at the lowest reinforcement of the beam
• cross-section and the force presented is the resultant of the two applied
loads
• GFRP bars have high deformation capacity, It's limit of 10 mm/m strain
RESULTS
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19. • The research program conducted by Marek Urbanski
• Bending test of 6 beams
• bottom reinforcement- BasaltFRP bars (diameter of 8 mm) and
steel bars(8mm) as reinforcement.
• Near the supports in all the beams steel stirrups for shear having
• 8 mm Φ have been provided.
FLEXURAL STRENGTHENING OF
BEAMS USING BFRP RODS
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20. Test beam
Top reinforcement in the regions of supports of all tested beams consisted of
two steel bars with a diameter of 8 mm.
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23. • It was noted that critical load for tested beams reinforced with BFRP
bars was much greater than the load carrying capacity(123.8%) of
beams with conventional steel reinforcement
• The failure of beams with BFRP reinforcement did not occur suddenly
and this effect was a result of transformation of the beam into a tie
system because of flexural basalt reinforcement remained unbroken.
RESULTS
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24. • Effective technique to the flexure capacity of R.C. beams.
• Increase load carrying capacity of the member.
• Material is good for reinforcing concrete structure near to the sea.
• The problems using FRP is to get bondage to the concrete, can solved
by using anchors to prevent slip in the concrete.
CONCLUSION
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