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TENSILE STRENGTH AND MECHANICAL TENSILE STRENGTH AND MECHANICAL PROPERTIES OF FIBER REINFORCED PLASTIC PROPERTIES OF FIBER REINFORCED PLASTIC REINFORCING BARS REINFORCING BARS David Imam David Imam and and Allison Johnson-Moore Allison Johnson-Moore Undergraduate Civil Engineering Research Undergraduate Civil Engineering Research University of Southern California University of Southern California

FRP Tensile Strength PPT-3

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Page 1: FRP Tensile Strength PPT-3

TENSILE STRENGTH AND MECHANICAL TENSILE STRENGTH AND MECHANICAL PROPERTIES OF FIBER REINFORCED PLASTIC PROPERTIES OF FIBER REINFORCED PLASTIC REINFORCING BARSREINFORCING BARS

David Imam David Imam andand Allison Johnson-Moore Allison Johnson-MooreUndergraduate Civil Engineering ResearchUndergraduate Civil Engineering Research

University of Southern CaliforniaUniversity of Southern California  

Page 2: FRP Tensile Strength PPT-3

Fiberglass rebar positive Fiberglass rebar positive attributesattributes

Impervious to chloride ion and Impervious to chloride ion and chemical attackchemical attack

Tensile strength greater than steelTensile strength greater than steel 1/4th weight of steel reinforcement1/4th weight of steel reinforcement Transparent to magnetic fields and Transparent to magnetic fields and

radio frequenciesradio frequencies Electrically non-conductiveElectrically non-conductive Thermally non-conductiveThermally non-conductive

Page 3: FRP Tensile Strength PPT-3

Fiberglass rebar negative Fiberglass rebar negative attributesattributes

Low Modulus of Elasticity Low Modulus of Elasticity Brittle natureBrittle nature

Page 4: FRP Tensile Strength PPT-3

ObjectiveObjective This exploratory study was carried This exploratory study was carried

out to for two purposes: out to for two purposes: to develop a suitable method for to develop a suitable method for

producing uniform stress throughout producing uniform stress throughout the member during testing the member during testing

to investigate the tensile strength of to investigate the tensile strength of Fiber Reinforced Plastic (FRP) Fiber Reinforced Plastic (FRP) reinforcing bars reinforcing bars

Page 5: FRP Tensile Strength PPT-3

Experimental OptionsExperimental Options Analyze a plain FRP specimenAnalyze a plain FRP specimen Wrap the ends of the sample in Wrap the ends of the sample in

epoxy-coated carbon fiber clothepoxy-coated carbon fiber cloth Encase the ends of the sample Encase the ends of the sample

with metal sleeveswith metal sleeves

Page 6: FRP Tensile Strength PPT-3

Experimental ProgramExperimental ProgramSetup:Setup: Cut specimen to Cut specimen to

appropriate lengthappropriate length Affix strain gauges Affix strain gauges

to barsto bars Encase select Encase select

samples in steel samples in steel tubingtubing

Page 7: FRP Tensile Strength PPT-3

Experimental ProgramExperimental ProgramTesting MethodTesting Method Secure specimen Secure specimen

in SATEC machinein SATEC machine Connect wires to Connect wires to

strain gauge strain gauge boxesboxes

Apply loadApply load Collect dataCollect data

Page 8: FRP Tensile Strength PPT-3

ObservationsObservations SlippageSlippage Epoxy failureEpoxy failure Tensile performanceTensile performance Specimen failureSpecimen failure

Page 9: FRP Tensile Strength PPT-3

Experimental ResultsExperimental Results

Bardiameter

(in)area (in2)

failure (force - kip)

Failure stress (psi)

Failure strain

Modulus of

Elasticity (psi)

steel ends A 0.64 0.3217 29.70 92322 0.01968 4.00E+06B 0.64 0.3217 21.96 68263 0.01840 4.00E+06

naked clamp C 0.41 0.1320 9.75 70374 0.02360 6.00E+07D 0.41 0.1320 - - - -

Page 10: FRP Tensile Strength PPT-3

Experimental ResultsExperimental Results

Failure of naked barFailure of naked bar

Page 11: FRP Tensile Strength PPT-3

Graphical ResultsGraphical Resultsstress-strain: bar-A

y = 4E+06x + 6742.8R2 = 0.9992

25000

45000

65000

85000

105000

0 0.005 0.01 0.015 0.02 0.025

strain

stre

ss (p

si)

stress vs strain(A)

Linear (stress vs strain(A))

stress-strain: bar-B

y = 4E+06x + 143.31R2 = 0.9918

-20000

0

20000

40000

60000

80000

100000

0 0.005 0.01 0.015 0.02

strain

stre

ss (p

si) stress vs. strain (B)

Linear (stress vs. strain(B))

stress-strain: bar-Cy = 6E+06x - 67613

R2 = 0.9978

0

20000

40000

60000

80000

0.01 0.015 0.02 0.025

strain

stre

ss (p

si) stress vs. strain (C)

Linear (stress vs. strain(C))

BAR A: large diameter steel ends

BAR B: large diameter naked ends

BAR C: small diameter steel ends

BAR D: small diameter naked ends (results unattainable)

Page 12: FRP Tensile Strength PPT-3

ConclusionConclusion Developed method relatively Developed method relatively

successfulsuccessful Modulus of Elasticity much less than Modulus of Elasticity much less than

steelsteel Failure stress much greater than Failure stress much greater than

steelsteel

Page 13: FRP Tensile Strength PPT-3

Sources of ErrorSources of Error Failure of epoxy to perform to full Failure of epoxy to perform to full

potentialpotential Specimen not completely verticalSpecimen not completely vertical SlippageSlippage

Page 14: FRP Tensile Strength PPT-3

ConclusionConclusionImprovements for Testing/Producing Improvements for Testing/Producing

FRPFRP Use a more ductile polymerUse a more ductile polymer Allow Epoxy to fully setAllow Epoxy to fully set Custom design metal sleevesCustom design metal sleeves Experiment with a variety of Experiment with a variety of

wrapping procedureswrapping procedures

Page 15: FRP Tensile Strength PPT-3

Thank For Thank For Coming to Our Coming to Our

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