ppt presentation 031512-final

8/11/2019 Ppt Presentation 031512-Final

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UTILIZATION OF STEEL FIBERS ASREPLACEMENT FOR STIRRUPS IN

REINFORCED CONCRETE BEAM


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INTRODUCTION

Stirrups are the conventional shear reinforcement forreinforced concrete beams. Resistance to diagonaltension and crack propagation are the advantages ofusing this conventional shear reinforcement. ut on the

other hand! some disadvantages have been found b"the researchers. The" think that this conventionalshear reinforcement increases the labor cost andprolongs the casting of steel reinforcement as #ell asthe forms. ecause of these! the researchers #ould liketo present an alternative shear reinforcement that hasa capabilit" similar to conventional$ the steel %ber.


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CONC&'TU() *R(+&,OR-


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ST(T&+&NT O* T& 'RO)&+

The stud" aims to evaluate thema/imum load of reinforced concretebeams utili0ing steel %ber as shear

reinforcement. (t the end of the researchthe follo#ing concerns #ill be addressed1

2.,hat are the e3ects of steel %ber #ith

di3erent volume fraction 45.56! 5.786!2.56 and 2.986: on reinforced concretebeam #ithout stirrups;


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9. ased on the ma/imum load! #hatare the advantages of specimens #ithsteel %ber over specimens containing

stirrups;


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=. ,hat are the similarities bet#eenspecimens #ith steel %bers andspecimens #ith stirrups based on the

test result;

8. o# consistent is the distribution ofsteel %bers on concrete mi/ture;

>. ,hich specimens on t#o batches donot e/ceed the percentage error of 86;


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?'OT&S&S1

2. Inclusion of steel %ber in the concrete mi/improves the ma/imum load of reinforcedconcrete beams.

9. Change in ma/imum load is directl"proportional to the change in volume fraction.


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O@&CTIA& O* T& STUD?

The main obBective of this stud" is to determine thepossibilit" of utili0ing steel %bers as replacement forstirrups in reinforced concrete beam.

Speci%call" the researchers #ould like to determine

the follo#ing12. The ma/imum load of reinforced concretebeams #ith di3erent number of stirrups1

a. 5

b.


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CHAPTER II:

RE&IE' OF RELATEDSTUDIES ANDLITERATURES


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R&AI&, O* R&)(T&D )IT&R(TUR& 4*OR&IN (ND)OC():

Seel Fiber a! Re(la"emen o) 'eb Rein)or"emen )or RCCDee( Beam! in Shear

Shear Sren$h o) Hi$h Sren$h Fiber Rein)or"ed Con"reebeam!

The e*e" o) +(e and ,ol%me )ra"ion -&F. o) !eel /ber onhe me"hani"al (ro(erie! o) !el)0"om(a"in$ "on"ree.

Sren$henin$ Beam0Col%mn 1oin 2ih Seel Fiber Rein)or"ed

Con"ree D%rin$ Earh3%a#e Loadin$4

Beha,ior o) Seel Fiber Rein)or"ed Con"ree Beam and Plae!%nder Sai" Load -lo"al.


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CHAPTER III:

RESEARCH DESI6NMETHODOLO67


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R&S&(RC +&TODO)O?

This stud" aims to observe and evaluate thema/imum load of reinforced concrete beamutili0ing steel %ber as shear reinforcement. This

chapter illustrates the procedure and test usedto attain the ma/imum load of the testspecimens. Researchers prefer to use concrete#ith the mi/ture proportion ratio of 212.81


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+(T&RI() US&D (ND T&ST S'&CI+&N D&T(I)

The steel %ber that #ill be used in this stud" has adiameter of 5.78mm and length of =5mm! andhaving an aspect ratio 4lFd: of >7. +i/ture proportionratio of 212.81 inches b" > inches b" 92inches rectangular reinforced concrete beam #ith mm diameter stirrups tosho# the change in ma/imum load.


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T&ST S'&CI+&NS


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GU()IT? T&ST O* +(T&RI()S

S(e"i/" 6ra,i+ o) "emen

-ASTM 89909 Den!i+ o) H+dra%li" Cemen.

Uni 'ei$h o) A$$re$ae!

-ASTM ;


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(CI 922 CONCR&T& +IH D&SIN 'ROC&DUR&

Sl%m( Te!:

Te! )or Sl%m( o) Fre!h Con"ree

-ASTM ;=809; Air Conen o) Fre!hl+

Mi?ed Con"ree b+ he Pre!!%reMehod.

Choi"e o) Ma?im%m Si@e o) A$$re$ae

E!imaion o) Mi?in$ 'aer and AirConen


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Sele"ion o) 'aer0Cemen or 'aer0Cemeniio%! maerial raio

Cal"%laion o) Cemen Conen

E!imaion o) Fine A$$re$ae Conen

Ad%!men )or A$$re$ae Moi!%re

Trial Ba"h Ad%!men


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T&ST 'ROC&DUR&

Specimens are to be designed in >inches b" >inches b"92 inches rectangular beam mold.

'repare design mi/! #hich #ill be used all throughout

the stud".

Trial mi/es are to be conducted to achieve the desiredcompressive strength of concrete.

(fter the trial mi/ has been establish! series of standardmi/ #ill produce #ith a standard 9 curing da"s.


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Then! prepare all specimens for third point loadingtests.

Record all data needed and assess the di3erencesin their strengths.

Data that #ill be presented on this stud" are to be

recorded b" the researches in an accurate detailedmanner based outcome of the test has been done.


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CURIN (ND C(STIN

During mi/ing of the steel %ber to the mi/edconcrete! balling$up of steel %bers can be avoided b"feeding the %bers into the mi/ in small Juantities ata time. ,hen the %bers are uniforml" spread over

the mi/! the mi/ture #ill be poured and compactedinto the beam molds. Used oil is used as lubricant tocover the molds for the ease of releasing thespecimens out of each mold. The specimens are

hardened %rst for about 9= hours. (fter thehardening! the specimens are released out of themolds and placed at room temperature. (ll thespecimens #ill undergo curing range of 9 da"s


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*)O, C(RT 'ROC&DUR&


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CHAPTER I&:

PRESENTATIONANAL7SIS ANDINTERPRETATION OF

DATA


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'R&S&NT(TION (ND (N()?SIS O*D(T(

Specimen Volume Fraction Number of Stirrups

eam A 0.0%

eam 1 0.75% -

eam 2 0.75% -

eam C1 1.0% -

eam C2 1.0% -

eam D1 1.25% -

eam D2 1.25% -

eam E - 3

eam F - 4

eam G

- 5


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The table above sho#s the di3erentnumber of stirrups and di3erent volumefraction of the specimens. The

researchers used four di3erent volumefractions ranging from 56 to 2.986 toestablish the right amount of steel

%bers to be added to the concrete mi/to attain the most durable sample afterseveral tests #ere conducted.


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T&ST R&SU)T S 'RO@&CTION O* S'R&CI+&N ,ITSTIRRU'S

5 < = 8 >95

=5

>5

D5

255

295

2=5

2>5

Fi$%re C48 Te! Re!%l! ProAe"ion o) he S(e"imen! 2ih Sirr%(!

*igure =.2 Test Results'roBection of theSpecimens #ithStirrups


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*igure =.2 sho#s the ma/imum loadproBection of reinforced concrete beams#ith stirrups as shear reinforcement.

*rom this proBection! the ma/imum loadincreases #ith the increasing numberof stirrups. (s e/pected! stirrups have

an abilit" to resist shear in reinforcedconcrete beam.


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T&ST R&SU)T S 'RO@&CTION O* S'R&CI+&N ,ITST&&) *I&RS 42ST(TC:

95

=5

>5

D5255

295

2=5

2>5

Fi$%re C4; Te! Re!%l! ProAe"ion o) he S(e"imen! 2ih Seel Fiber! -8! ba"h.


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T&ST R&SU)T S 'RO@&CTION O* S'R&CI+&N ,ITST&&) *I&R& 49ND (TC:

95

=5

>5

D5255

295

2=5

2>5

/$%re C4= e! re!%l! (roAe"ion o) he !(e"imen! 2ih !eel /ber! -;nd Ba"h.

9nd batch


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*igure =.< sho#s the ma/imum loadproBection of the 9ndbatch of reinforcedconcrete beams #ith steel %bers as

shear reinforcement. ased on the %guresho#n! it sho#s that the ma/imum loadincreases #ith increasing volume

fraction. Therefore! #e can sa" thatsteel %bers have the abilit" to resistshear in reinforced concrete beam.


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CO+'(RISON &T,&&N T,O (TC&S O* S'&CI+&N,IT ST&&) *I&RS

Specimen Vo!me

F"ac#ion

1

$#

a#c

&'()

2

n*

a#c

&'()

A+e"a,e

&'()

e"cen#a,

e E""o"

&%)

A

0.0% 5.047 5.047 5.047 0

0.75% 111.474 120.30/ 115./1 3./1

C

1.0% 141.334 143.74 142.537 0./4

D

1.25% 147.74 147.30/ 147.53 0.15


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CO+'(RISON &T,&&N T,O (TC&S O* S'&CI+&N,IT ST&&) *I&R

95

=5

>5

D5

255

295

2=5

2>5

2st atch

9nd atch

(verage

Figure 4.4 Com(ari!on be2een T2oBa"he! o) S(e"imen! 2ih SeelFiber!


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*igure =.= sho#s the ma/imum load proBectionof t#o batches of reinforced concrete beams#ith steel %bers. (lso! their average isproBected. (s #e can see from the %gure! the

ma/imum load of the 2stbatch and 9ndbatchare almost eJual and their percentage errorsdo not e/ceed the allo#able error. ased onthese results! #e can sa" that the distribution

of steel %bers into t#o batches is consistent.Therefore! #e can use the ma/imum load ofan" of the t#o batches.


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FI6URE 4 COMPARISONS BET'EEN TEST RESULTS OFSPECIMENS 'ITH STIRRUPS AND 'ITH STEEL FIBERS

( & * C D

specimens #ithstirrups

specimens #ith steel%ber


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*igure =.8 presents the comparison bet#een the testresults of specimens #ith stirrups and specimens#ith steel %bers as shear reinforcement. Smallervalue bet#een2st batch and 9nd batch #ere used to

allo# the possibilit" of error in distribution of steel%ber in the concrete mi/ture. ased on the %gure! itis clearl" evident that steel %bers and stirrups canincrease ma/imum load in reinforced concretebeams. +a/imum load in specimens #ith stirrups

increases #ith increasing number of stirrups. (lso!ma/imum load in specimens #ith steel %bersincreases #ith increasing volume fraction.


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ased also from the result! it is visibl" seen thatspecimens #ith steel %bers have an advantage overspecimens #ith stirrups. The increase in ma/imumload of specimens #ith steel %bers is more than for

the specimens containing stirrups. (lso! for theentire specimens tested! utmost ma/imum load isattained in specimen #ith steel %bers #hich isS'&CI+&N D2! #ith the ma/imum load of 2=7.7=K-N. These results support the use of steel %ber asreplacement to conventional shear reinforcement4stirrups: in reinforced concrete beams.


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GU()IT? T&ST R&SU)T

Sample Quality Test Specification(ACI) Test esult emar!s

FineGrading Fineness

Modulus 2.3-3.1 2.4 Passed

Specific Gravity 2.3-2.9 2.55 Passed

Moisture ontent 11.!2 Passed

"#sorption $-1$% 5.$3% Passed

&nit 'eig(t)oose

*odded12+$- 192$12+$- 192$

14!+.2!1,23.$2

PassedPassed

CoarseGrading- "#rasion 5$% 23.+!% Passed

Specific Gravity 2.5-3.$ 2.+3 Passed

Moisture ontent $.544% Passed

"#sorption $-2% $.!4,% Passed

&nit 'eig(t)oose*odded

145$-1!5$145$-1!5$

15,5.25,1!4+.43+

PassedPassed

Cement Specific Gravity 2.94-3.15 3.$2 Passed


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D&SIN +IHTUR&

"ater (to be a##e#) $%& !g

eent '&g

oarse "ggregate /0et $$%%g

Fine "ggregate /0et &&%g

TTA* +',g

The E!imaed Ma!!e! (er Re"an$%lar Beam


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CONCRETE MITURE PROPORTION RATIO

8:849:=4;


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,&IT O* AO)U+& *R(CTION

Specimen e"cen#

Vo!me

F"ac#ion

&%)

Vo!me o0

S#ee 0ie"

&mm

3

)

ei,# o0

S#ee

Fie"

&,)

A

0 0 0

0.75 214.65 0.75

C

1.0 123//6.20 1.00


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The Table sho#n above presents the#eight of steel %ber that #ill be addedto the concrete mi/ture of specimen (!

! C! and D. The steel %bers #ill serveas the shear reinforcement of thespecimen.


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CHAPTER &:

SUMMAR7 OF FINDIN6SAND OBSER&ATIONS

CONCLUSIONS

AND RECOMMENDATIONS


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SU++(R? O* *INDINS (ND OS&RA(TION

(fter anal"0ing the data gathered andconducting series of tests! the researchersarrived to these %ndings and observations1

2. *or all the specimens tested in this stud"!highest ma/imum load #as attained inspecimen #ith steel %bers #hich isS'&CI+&N D2 #ith a volume fraction of

2.986. This result supports the use of steel%ber as a replacement to conventional shearreinforcement 4stirrups:.


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9. The ma/imum load of specimens #ith steel %bersincreases #hen the volume fraction or steel %bercontent also increases. *rom the result of thee/periment made! steel %ber #ith volume fraction of56! 5.786! 2.556! and 2.986 had a ma/imum load

of 8K.5=7-N! 222.=7=-N! 2=2.


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=. The ma/imum load of %rst batch and secondbatch of specimens #ith steel %bers are almosteJual. The percentage error for specimen ! C!and D are


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CONC)USIONS

(fter the e/perimentation! the researchersarrived to these follo#ing conclusions1

2. Steel %bers can be used as a replacement to

conventional shear reinforcement in reinforcedconcrete beams.

9. (ppl"ing steel %bers to the concrete mi/turegives a good result in increasing the ma/imum

load of reinforced concrete beams #ithoutstirrups. (s the volume fraction increases! thema/imum load increases as #ell.


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. The steel %bers can be consistentl" distributedin the reinforced concrete beams #ithout stirrups.


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R&CO+&ND(TIONS

Researchers recommend futurepursuers of this stud" to use otherconcrete mi/ture to kno# if the

compressive strength of concretea3ects the result of the test.

Researchers recommend using higher

volume fraction. Through this! #e #illkno# the ma/imum volume fractionthe beam could obtain.


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Researchers recommend tr"ing three ormore batches of reinforced concrete beam#ith steel %bers to observe more of theconsistenc" of the steel %ber distribution

on concrete mi/.Researchers recommend using di3erent

dimensions of beam to determine thee3ect of the si0e in the reinforced concrete

beam #ith steel %bers.ased on the results! the researchers

recommend to use steel %bers as shearreinforcement in reinforced concrete beam.


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ppt presentation 031512-final

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