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PRESTRESSEDPRESTRESSED
CONCRETECONCRETE
STRUCTURESSTRUCTURES
BY,BY,
A.DINESHA.DINESH
ROLL NO:137R5A0101ROLL NO:137R5A0101
CMRTC.CMRTC.
Department ! C"#"$ En%"neer"n%Department ! C"#"$ En%"neer"n%
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CONTENTSCONTENTS
IntroductionIntroduction
How to make prestressed concreteHow to make prestressed concrete
AdvantagesAdvantages
Difference between RCC !SCDifference between RCC !SC
!SC in Construction Industr"!SC in Construction Industr"
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INTRODUCTION-INTRODUCTION-
A Brief HistoryA Brief History
E&%ene 're())"net *1+7-1/ e#te m&2 ! ")E&%ene 're())"net *1+7-1/ e#te m&2 ! ")
$"!e t te re)ear2 e#e$pment an 2n)tr&2t"n !$"!e t te re)ear2 e#e$pment an 2n)tr&2t"n !
pre)tre))e 2n2rete )tr&2t&re) an ") r"%t$( namepre)tre))e 2n2rete )tr&2t&re) an ") r"%t$( name
4te !ater ! pre)tre))e 2n2rete. It ") tr&% ")4te !ater ! pre)tre))e 2n2rete. It ") tr&% ")
e"2ate re)ear2 tat man( ! te te2n"6&e) ane"2ate re)ear2 tat man( ! te te2n"6&e) an
pra2t"2e) &)e ta( t &"$ )pe2ta2&$ar anpra2t"2e) &)e ta( t &"$ )pe2ta2&$ar an
ae)tet"2 )tr&2t&re) are p))"$e.ae)tet"2 )tr&2t&re) are p))"$e.
're())"net a2"e#e te 8r)t )&22e)) 9"t pre)tre))e're())"net a2"e#e te 8r)t )&22e)) 9"t pre)tre))e
2n2rete "n mar"ne 2n)tr&2t"n, a#"n% )e2&re te2n2rete "n mar"ne 2n)tr&2t"n, a#"n% )e2&re te
tener t 2rre2t te treatene !&nat"n) ! tetener t 2rre2t te treatene !&nat"n) ! te
LeHar#e mar"ne term"na$ &)"n% pre)tre)) te2n"6&e).LeHar#e mar"ne term"na$ &)"n% pre)tre)) te2n"6&e).
TheThe
beginningbeginning
E&%ene !re())"net*1+7-1/E&%ene !re())"net*1+7-1/
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PrecastPrecast
pretensionepretensione
ho!!o" for#eho!!o" for#e
s!abss!abs re)tre))e 2n2rete ") &)e ta( !rre)tre))e 2n2rete ") &)e ta( !r$ar%e &"$"n% 9r;) "n man( 2"#"$$ar%e &"$"n% 9r;) "n man( 2"#"$en%"neer"n% 8e$) )&2 a)en%"neer"n% 8e$) )&2 a)....
Ra)Ra) B&"$"n%)B&"$"n%) Br"%e)Br"%e)
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INTROD#CTIONINTROD#CTION
contd$contd$
A prestressed concrete member is one in w%ic% t%ere %aveA prestressed concrete member is one in w%ic% t%ere %ave
been introduced interna& stresses of suc% a magnitude' and a&sobeen introduced interna& stresses of suc% a magnitude' and a&so
distribution' t%at t%e stresses resu&ting from e(terna& &oading aredistribution' t%at t%e stresses resu&ting from e(terna& &oading are
counteracted to a desired degree)counteracted to a desired degree)
*H+ !RESTRESS ,*H+ !RESTRESS ,
!restressing app&ies an initia& compressive a(ia& force to t%e!restressing app&ies an initia& compressive a(ia& force to t%e
concrete w%ic% great&" reduces or e&iminates t%e interna&concrete w%ic% great&" reduces or e&iminates t%e interna&
stresses)stresses)
It does t%is app&"ing a tensi&e stress to a stee& cab&e runningIt does t%is app&"ing a tensi&e stress to a stee& cab&e running
t%roug% t%e concrete) T%e stee& cab&e is t%en anc%ored and t%et%roug% t%e concrete) T%e stee& cab&e is t%en anc%ored and t%e
compressive force is t%en transferred to t%e concrete b" t%ecompressive force is t%en transferred to t%e concrete b" t%e
bond forces$bond forces$
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Te ene8t) ! pre)tre))"n% are :-Te ene8t) ! pre)tre))"n% are :-1.1. Cra2;"n% ") %reat$( re&2e r e$"m"nate, anCra2;"n% ") %reat$( re&2e r e$"m"nate, an
/./. App$("n% te pre)tre))"n% !r2e e$9 teApp$("n% te pre)tre))"n% !r2e e$9 te
ne&tra$ a=") "n&2e) te mment) 9"2 pp)ene&tra$ a=") "n&2e) te mment) 9"2 pp)e
t)e 2a&)e ( te e=terna$$( app$"e $a),t)e 2a&)e ( te e=terna$$( app$"e $a),t&) )"%n"82ant$( re&2"n% e>e2t"n.t&) )"%n"82ant$( re&2"n% e>e2t"n.
3.3. Memer )e2t"n) are )ma$$er tan re"n!r2eMemer )e2t"n) are )ma$$er tan re"n!r2e
2n2rete )e2t"n) !r te )ame "mp)e $a)..2n2rete )e2t"n) !r te )ame "mp)e $a)..
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Base on the #etho of app!yingBase on the #etho of app!yingprestress to the concrete #e#ber, theprestress to the concrete #e#ber, the
Prestressing can be c!assie as.-Prestressing can be c!assie as.-
PRE-TENSIONIN/ 0ETHOD +PRE-TENSIONIN/ 0ETHOD +
POST-TENSIONIN/ 0ETHOD+POST-TENSIONIN/ 0ETHOD+
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PRE-TENSIONIN/PRE-TENSIONIN/
re ten)"n"n% ") ne met ! app$("n% pre)tre)),t&) ?re ten)"n"n% ") ne met ! app$("n% pre)tre)),t&) ?
Tenn) e"ter pa)) tr&% a )"n%$e m&$ r a $"ne ! m&$)Tenn) e"ter pa)) tr&% a )"n%$e m&$ r a $"ne ! m&$)!r m&$t"p$e memer) arran%e en t en an 2an e atta2e!r m&$t"p$e memer) arran%e en t en an 2an e atta2eat ne en t 8=e an2ra%e.at ne en t 8=e an2ra%e.
Te tenn) are ten ten)"ne !rm te 8=e an2ra%eTe tenn) are ten ten)"ne !rm te 8=e an2ra%eet9een an e=terna$ "nepenent an2ra%e t %"#e teet9een an e=terna$ "nepenent an2ra%e t %"#e tere6&"re ten)"$e !r2e "n te tenn.re6&"re ten)"$e !r2e "n te tenn.
Te tenn) are ten e$ "n p$a2e 9"$e te 2n2rete ") p&re.Te tenn) are ten e$ "n p$a2e 9"$e te 2n2rete ") p&re.
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Te tenn) are ten 8na$$( tr"mme @ a)Te tenn) are ten 8na$$( tr"mme @ a)
)9n e$9)9n e$9..
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POST-TENSIONIN/POST-TENSIONIN/
)t-Ten)"n"n% ") anter met ! app$("n% pre)tre)) t a 2n2rete)t-Ten)"n"n% ") anter met ! app$("n% pre)tre)) t a 2n2retememer, t&)-memer, t&)-
Te tenn ") p$a2e "n te 2rre2t p)"t"n "n te !rm9r;Te tenn ") p$a2e "n te 2rre2t p)"t"n "n te !rm9r;9"t te ea-en an2ra%e an $"#e en an2ra%e, tr&%9"t te ea-en an2ra%e an $"#e en an2ra%e, tr&%9"2 te tenn pa))e).9"2 te tenn pa))e).
Te 2n2rete ") ten p&re an $e!t t aren.Te 2n2rete ") ten p&re an $e!t t aren.
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Dea-enDea-enanchorageanchorage
T pre#ent te tennT pre#ent te tenn!rm )$"pp"n% a2; "t ")!rm )$"pp"n% a2; "t ")$2;e "nt te$2;e "nt te
an2ra%e ( mean) !an2ra%e ( mean) !a )p$"t 9e%e $2ate "na )p$"t 9e%e $2ate "nte arre$ ! tete arre$ ! tere2e))e an2ra%e.re2e))e an2ra%e.
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Tenn) &)e !r pre)tre))"n% %enera$$(Tenn) &)e !r pre)tre))"n% %enera$$(2n)")t) ! )e#era$ "% )tren%t )tee$ 9"re) !2n)")t) ! )e#era$ "% )tren%t )tee$ 9"re) !)ma$$ "ameter 9rappe ar&n a )"m"$ar 9"re.)ma$$ "ameter 9rappe ar&n a )"m"$ar 9"re.
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T%is is ca&&ed aT%is is ca&&ed aprestressingprestressingstrand -strand -Tendons) .adeTendons) .ade
of %ig% strengt%of %ig% strengt%stee&' it wi&&stee&' it wi&&
soon besoon be
embedded inembedded in
concrete)concrete)
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Ba)e n 9 te tenn) are &)e ,te( 2an eBa)e n 9 te tenn) are &)e ,te( 2an e2$a))"8e a)2$a))"8e a)
1.1. Bne tenn)Bne tenn)/./. nne tenn).nne tenn).
Bne tenn) 2an a$) e &)e. Te pr2e)) ")Bne tenn) 2an a$) e &)e. Te pr2e)) ")
e))ent"a$$( te )ame e=2ept tat te pre)tre))"n%e))ent"a$$( te )ame e=2ept tat te pre)tre))"n%!r2e ") tran)!erre t te 2n2rete t ( rea2t"n)!r2e ") tran)!erre t te 2n2rete t ( rea2t"n)at te an2ra%e) an ( te n )tre))e) et9eenat te an2ra%e) an ( te n )tre))e) et9eente 2n2rete an te ne tenn.te 2n2rete an te ne tenn.
nne tenn) are nrma$$( a))em$e &nernne tenn) are nrma$$( a))em$e &ner!a2tr( 2n"t"n). Te( 2n)")t) ! )tran) r!a2tr( 2n"t"n). Te( 2n)")t) ! )tran) r9"re) tat are 9rappe r en2a)e "n p$a)t"2 a#"n%9"re) tat are 9rappe r en2a)e "n p$a)t"2 a#"n%een 8r)t 2ate 9"t %rea)e r a "t&m"n&)een 8r)t 2ate 9"t %rea)e r a "t&m"n&)mater"a$.mater"a$.
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In t") >rIn t") >r
2n)tr&2t"n2n)tr&2t"n
ne tenn)ne tenn)
are pr#"e "n teare pr#"e "n teeam) an teeam) an te
&nne tenn)&nne tenn)
"n te r") ! te"n te r") ! te
tr&% )$a.tr&% )$a.
BONDEDBONDED
UNBONDEDUNBONDED
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Te pt%rapTe pt%rap
)9) te)9) te
tenn $a(&t !rtenn $a(&t !r
a p)t-ten)"nea p)t-ten)"ne
>at )$a.>at )$a.
Te tenn) are p$a2e "n p)"t"n e!re te 2n2rete ")Te tenn) are p$a2e "n p)"t"n e!re te 2n2rete ")
p&re.
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How !restressed concrete is madeHow !restressed concrete is made
It a&& begins at t%e prestressed concrete p&ant)
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T%e prestressingT%e prestressing
strand is stretc%edstrand is stretc%ed
across t%e castingacross t%e casting
bed)bed)
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An2ra%e) emee "n te 2n2rete memer are %enera$$(An2ra%e) emee "n te 2n2rete memer are %enera$$(
re6&"re n$( !r p)t ten)"n"n%. re ten)"ne memer) arere6&"re n$( !r p)t ten)"n"n%. re ten)"ne memer) are
man&!a2t&re an are an2re ( n )tre))e) rater tanman&!a2t&re an are an2re ( n )tre))e) rater tan
an2ra%e).an2ra%e).
One an2ra%e )"mp$( $) te en ! te tenn "n p)"t"n ,One an2ra%e )"mp$( $) te en ! te tenn "n p)"t"n ,9"$e te ter ") &)e 9"t te a2; t )tre)) te tenn. Ea29"$e te ter ") &)e 9"t te a2; t )tre)) te tenn. Ea2
an2ra%e ") atta2e t te en ! te tenn e!re tean2ra%e ") atta2e t te en ! te tenn e!re te
2n2rete ") p&re .Te t(pe ! an2ra%e &)e epen) n te2n2rete ") p&re .Te t(pe ! an2ra%e &)e epen) n te
n&mer ! tenn) an 9eter te( are )tran) r 9"re).n&mer ! tenn) an 9eter te( are )tran) r 9"re).
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A pre)tre))"n% a2; ")A pre)tre))"n% a2; ")atta2e t te &t)"eatta2e t te &t)"ep$ate ! te an2ra%ep$ate ! te an2ra%e
tr&% 9"2 te en)tr&% 9"2 te en)! te tenn) pre2t.! te tenn) pre2t.On2e te a2; a) eenOn2e te a2; a) een2nne2te t te2nne2te t tetenn), )tre))"n% 2antenn), )tre))"n% 2ane%"n. Tee%"n. Tepreeterm"nepreeterm"ne)tre))"n% !r2e 2an e)tre))"n% !r2e 2an eapp$"e t ea2 tennapp$"e t ea2 tenn
"n"#"&a$$(. Te !r2e ")"n"#"&a$$(. Te !r2e ")app$"e a22r"n% t teapp$"e a22r"n% t tee)"%n en%"neer)e)"%n en%"neer))pe2"82at"n).)pe2"82at"n).
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Specia& trucks bringSpecia& trucks bringt%e concrete to t%et%e concrete to t%ecasting bed w%erecasting bed w%ere
t%e pouring begins)t%e pouring begins)
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Once t%eOnce t%e
pouring ispouring is
comp&ete' acomp&ete' atarp is p&acedtarp is p&acedover t%e formover t%e formand app&ied toand app&ied to
cure t%ecure t%e
cementcement
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T%e prestressing strandsT%e prestressing strandsare cut and t%e concreteare cut and t%e concreteform is removed from t%eform is removed from t%e
casting bed)casting bed)
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T%e ends areT%e ends are
c&eaned and t%ec&eaned and t%e
prestressingprestressingstrands are sea&edstrands are sea&edwit% a protectivewit% a protectivecoatingcoating
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T%e end/productT%e end/productis s%ipped to ais s%ipped to a
bui&ding site)bui&ding site)
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Bon StressesBon Stresses Te pre)tre)) !r2e "n a ne tenn ")Te pre)tre)) !r2e "n a ne tenn ")
tran)!erre t te 2n2rete ( n )tre))e).tran)!erre t te 2n2rete ( n )tre))e). Tere are t9 )ta%e) at 9"2 n )tre))e) areTere are t9 )ta%e) at 9"2 n )tre))e) are
2n)"ere "n te e)"%n ! pre)tre))e 2n2rete2n)"ere "n te e)"%n ! pre)tre))e 2n2rete
e$ement).e$ement).
At Tran)!er,At Tran)!er, te tenn) ! a preeterm"nete tenn) ! a preeterm"ne
e$ement are re$ea)e, an te pre)tre)) !r2e ")e$ement are re$ea)e, an te pre)tre)) !r2e ")
tran)!erre t te 2n2rete ( n )tre))e).tran)!erre t te 2n2rete ( n )tre))e).
'$e=&ra$ n )tre))e)'$e=&ra$ n )tre))e)e#e$p 9en memer) aree#e$p 9en memer) are)&e2te t e=terna$ $a"n%. H9e#er ,)&2)&e2te t e=terna$ $a"n%. H9e#er ,)&2
)tre))e) are $";e$( t e ne%$"%"$e &nt"$ te)tre))e) are $";e$( t e ne%$"%"$e &nt"$ te
memer a) e#e$pe >e=&ra$ 2ra2;).memer a) e#e$pe >e=&ra$ 2ra2;).
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AD0ANTA1ESAD0ANTA1ES
Improved resistance to s%earing forcesImproved resistance to s%earing forces
Reduce t%e s%ear forces deve&oped at t%e supportReduce t%e s%ear forces deve&oped at t%e support
sectionssections
StifferStiffer
Indirect &ong term savings is more)Indirect &ong term savings is more)
Econom" for &ong span structuresEconom" for &ong span structures
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CO.!ARISON 2ET*EEN RCC !SCCO.!ARISON 2ET*EEN RCC !SC
Tensi&e Strengt%Tensi&e Strengt%
StiffnessStiffness
S%earS%ear
Cracking def&ectionCracking def&ection
Serviceabi&it"Serviceabi&it"
Econom"Econom"
Safet"Safet"
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!restressed concrete in construction!restressed concrete in construction
industr"industr"
It is we&& estab&is%ed fact t%at t%e basic econom" ofIt is we&& estab&is%ed fact t%at t%e basic econom" ofprestressed concrete &ies in its %ig% strengt% to weig%tprestressed concrete &ies in its %ig% strengt% to weig%tand strengt% to cost ratios ' its resistance to fire and strengt% to cost ratios ' its resistance to fire corrosion' its versati&it" and adaptabi&it")corrosion' its versati&it" and adaptabi&it")
It is idea&&" suited forIt is idea&&" suited for
3ong span 2ridges3ong span 2ridges
.u&tistor" bui&dings/4&at s&abs.u&tistor" bui&dings/4&at s&abs
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Hig%wa" 56 2ridge over Osage River in .issouri 3and Crossing /
*est Span and Abutment
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T%e 4&at S&ab f&ooring
s"stem incorporates
prestressed concreteunits designed for eas"
and fast p&acement
w%i&e re7uiring t%e
minimum on site work
to obtain a finis%ed
f&oor and cei&ing)
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T%e &arge component
units are craned into
position' providing an
immediate working
p&atform w%ic%' wit% t%eaddition of an in situ
concrete topping' gives a
suspended f&oor wit% a
f&at' stee& formed soffit)
Temporar" propping isre7uired for &onger
spans)
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S%##aryS%##ary
H9 t ea$ 9"t te $9 ten)"$e )tren%t ! 2n2rete (H9 t ea$ 9"t te $9 ten)"$e )tren%t ! 2n2rete (
pre)tre))"n% te memer.pre)tre))"n% te memer. Te me2an"2) ! te pre)tre))"n% )()tem &)"n% a r9 !Te me2an"2) ! te pre)tre))"n% )()tem &)"n% a r9 !
;) a) e=amp$e.;) a) e=amp$e.
H9 te pre)tre))"n% !r2e ") app$"e t a memer at )"te.H9 te pre)tre))"n% !r2e ") app$"e t a memer at )"te.
A r"e! ")tr( ! te e#e$pment ! pre)tre))"n% !rm "t)A r"e! ")tr( ! te e#e$pment ! pre)tre))"n% !rm "t)
"n#entr E&%ene 're())"net &p t te mern a(."n#entr E&%ene 're())"net &p t te mern a(.
Te met) ! pre)tre))"n%-Te met) ! pre)tre))"n%-
re ten)"ne pre)tre))"n%,re ten)"ne pre)tre))"n%,
)t ten)"ne re)tre))"n%,)t ten)"ne re)tre))"n%,
Bne an &nne tenn),Bne an &nne tenn), An2ra%e),An2ra%e),
Bn )tre))e).Bn )tre))e).
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THANK YOUTHANK YOU
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