frp tensile strength ppt-3
DESCRIPTION
FRPTRANSCRIPT
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
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
Fiberglass rebar negative Fiberglass rebar negative attributesattributes
Low Modulus of Elasticity Low Modulus of Elasticity Brittle natureBrittle nature
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
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
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
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
ObservationsObservations SlippageSlippage Epoxy failureEpoxy failure Tensile performanceTensile performance Specimen failureSpecimen failure
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 - - - -
Experimental ResultsExperimental Results
Failure of naked barFailure of naked bar
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)
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
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
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
Thank For Thank For Coming to Our Coming to Our
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