metal reinforcement

8/19/2019 Metal Reinforcement

1/91

METAL REINFORCEM


2/91

STEELBARS

Steel is the most widely used reinforcing mteril for lmoconcrete construction "

E#cellent !rtner of concrete in resisting $oth tension nd stresses"

Steel is ten times stronger in resisting com!ression lod ntimes stronger in tensile stresses"


3/91

Stndrd weight of !lin round$rs in %ilogrms

Diam. 5.O m. 6.0 m. 7.5 m. 9.0 m. 10.5m. 12.m.

&mm '"(& )"*+ )"(, *"-, ."'- ."+

'/mm *"/& *"+/ .",) -"-. ,".+ +"*

')mm .".. -"** ,",, +"(( ("*) '/"

'*mm -")' ,")- +"&* ("*& '/"(. ')"

',mm +"(/ (".+ ''"&. '.")' ',"-& '&"

)/mm ')"** '."&/ '&"-/ ))"'( )-",( )("

)-mm '(")+ )*"') )&"(/ *.",& ./"., .,"

)&mm )."'+ )("// *,")- .*"-/ -/"+- -&"

*/mm )+"+- **")( .'",) .("(. -&"), ,,"

*)mm *'"-+ *+"&& .+"*- -,"&) ,,")( +-"

*,mm *("(, .+"(- -("(* +'"() &*"(' (-"


4/91

0eformtion re1uirementsNominaldiameter

Maxaveragesspacing of

lgs

!eig"tminimm

#olerancemaximm

& +"/ /"* /",

'/ +"/ /". /"&

') &". /"- '"/

'* ("' /", '")

', ''") /"+ '".

)/ '."/ '"/ )"/

)- '+"- '") )".

)& '(", '". )"&

*/ )'"/ '"- *"/

*) ))". '", *")

*, )."- '"& *",


5/91

Mechnicl !ro!erties of steel $r

clss 2rde

3ieldstrength

M!mm

Tensilestrength

M!mm

S!ecimenmm

Elongtion in

)//mm!ercent

mm

Be

des!e

• 5otrolled

• Non6weld$le• Steel $r

)*/

)+-

.'-

)*/

)+-

.'-

*(/

.&/

,)/

07)-

07)-08)-07)-08)-

'&

','/&+

• 5otrolled

• weld$le

0eformed

or !lin

)*/

)+-

.'-

)*/

.&/

.'-

*(/

.&/

--/

07)-

08)-

07)-

07)-08)-

)/

'&

',

'.')


6/91

, )& -+ &- ''* '.' '+/ '(& )),

& -/ '/' '-' )/' )-' */) *-) ./)

'/ +( '-+ )*, *'. *(* .+' --/ ,)&

') ''* )), **( .-) -,- ,+( +() (/-

', )/' ./) ,/* &/. '//- ')/, './+ ',/&)/ *'. ,)& (). ')-+ '-+' '&&- )'(( )-'*

). .(' (&) '.+* '(,* ).-. )(.- *.*, *()+

*) &/. ',/& ).') *)', ./)' .&)- -,)( ,.**

./ ')-, )-'* *+,( -/), ,)&* +-*( &+(, '//-

' ) * . - , + &

Br0i"

mm

Num$er of steel $rs 9


7/91


8/91


9/91


10/91


11/91


12/91


13/91

The :rious ty!e of metl reinforcement tht the estim$e fmiliri;ed

$. %oncrete "ollo& 'loc(s reinforcement

The sim!lest ty!e of :erticl nd hori;ontl reinforcement !$etween the lyers nd the hollow core of the $loc%s"

This ty!e of reinforcement is instll nd s!liced !rogressi:eof the concrete $loc%s

).*ooting reinforcements

'" Footing sl$ reinforcement for smll nd medium si;e footi

)" 0owels< cut $rs< nchor< nd $end $rs

*" Bem nd sl$ for lrge construction

." Stirru!s


14/91

c" =ost nd column reinforcement

'"Min :erticl reinforcement"single

$"$undle

)" Lterl ties

" outer ties

$"inner ties*" S!irl ties for circulr column

."0owels for !rtitions nd future ttchements


15/91

0"Bem nd girder reinforcements

' min reinforcement

" stright $rs

$" $end $rs

c" dditionl cut $rs for tension nd com!ression

d" dowel $rs for the future ttchment

)" Stirru!s

" o!en stirru!s

$" closed stirru!s

c" stright stirru!s or ties

*cut $rs

" o:er nd cross the su!!ort

$" $etween su!!orts

c"dowels nd hngers for ceiling nd !tition


16/91

E" >oor sl$ reinforcement

'" Min reinforcement

a" stright min reinforcing $ts e#tending from one $emother

'. lternte min reinforcing $rs with $end $etween ndthe $em su!!ort

c" min lternte $rs o:er su!!ort

)" Tem!erture $rs tied !er!endiculr to the min reinfo

*" Additionl lternte cut $rs o:er the su!!ort 9$em?

." dowels nd hngers for ceiling nd other ttchement


17/91


18/91


19/91

Reinforcing of concrete hollow $loc%s

%oncrete "ollo& 'loc(s reinforcement cold 'e determine

'" direct conting met"od

:erticl nd hori;ontl reinforcement re counted in the !ln< the

determined from he ele:tion< the hoo% nd $end nd l!!ing s!imgin$ly clculted nd dded to its length"?

)" '+ t"e area met"od

the sim!lest !!roch in com!uting steel $r reinforcement in Cthe id of t$le *6-

*"'+ t"e nit 'loc( met"od


20/91


21/91

From @gure *6, determine the following

"'/#)/#./ cm C5B

$"erticl reinforcement s!ced t &/ cmc"5ori;ontl reinforcement t e:ery * lyers


22/91


23/91


24/91


25/91


26/91

Find the tie wire in %ilogrms if the reinforcements re s!ced t


27/91

Find the tie wire in %ilogrms if the reinforcements re s!ced t'":erticl $rs s!ced t &/ cm nd one hori;ontl $r t e:ery * ly$loc%) ":erticl $rs t ,/ cm nd one hori;ontl $r t e:ery fter ) lye$loc%*"tie wire in %ilogrms"


28/91


29/91

Things to remem$er in estimting steel $rs reinforcement @rst@nd the re1uired length nd 1untity of !rticulr reinforcement


30/91

@nd the re1uired length nd 1untity of !rticulr reinforcement choose commercil length of the $rs which when cut into the re1

si;es will minimi;e unwnted cutsfor instnce -!csD'")/m" Long is needed


31/91


32/91


33/91


34/91


35/91


36/91

=ost nd column reinforcement


37/91

=ost nd column reinforcement/einforcement of post and colmn to 'e considered in t"is s

" The min or the :erticl reinforcement

$" The lterl ties

c" The s!irl ties for circulr column


38/91

The 1untity nd length of the minreinforcement is determined $y direct coun

methoda" l! oints of ends s!lices'. llownce for $ending nd hoo%c" dditionl length for $em de!th nd >o

thic%ness if the height indicted in !ln is f

>oor to ceilingd. distnce from >oor to footing sl$e. !ro:isions for s!lices of succeeding >oor


39/91


40/91


41/91


42/91

Lterl ties


43/91

Tied column hs reinforcement consisting of :erticl $rs he!osition $y lterl reinforcement clled lterl ties"

The ACI code !ro:ides tht all non pre- stressed bars for tie

shll $e enclosed $y lterl ties of t lest no"* in si;e for lo

$rs no"'/ or smller nd t lest no". in si;e for no"'' to '&$undled longitudinl $rs"

#"e code provision simpl+ mean t"at

a. If the min longitudinl reinforcement of tied column is or smller in si;e 9lower thn */mm?


44/91

the following

'" ', # the longitudinl $r dimeter

)" .& # the lterl tie $r dimeter or

*" The lest dimension of the column


45/91


46/91


47/91


48/91


49/91


50/91

Sol:ing for the tie wire


51/91

'"Find the num$er of the intersections $etween the min reinforcemelterl ties

No" of ties ),#*/ column 4,


52/91


53/91


54/91


55/91


56/91


57/91


58/91


59/91


60/91


61/91


62/91


63/91


64/91


65/91


66/91


67/91


68/91


69/91


70/91


71/91


72/91


73/91


74/91


75/91


76/91


77/91


78/91


79/91


80/91


81/91


82/91


83/91


84/91


85/91


86/91


87/91


88/91


89/91


90/91


91/91

metal reinforcement

Documents