Omposile Seclions
In Compoaite onslrucfion, a precOst pre-SHesed. pot is
USed in ombinahion uith a Cast n-Situ Part
Precast pre-sltessel mermbers uuith concrete cast-in-situ
be have as monelithic units under servie loads.
High 3trength Pre-StteSscl units are used in the tensish
2one and cast in-Situ in compresion zone.
DiHterentfal shrinkage between concrete ast in-sttu and
Pre-gre0e unit Contributes tor monelithic action.
Types of Composite Section -
Most Common - Snverted T beams placed side by side
-Distribuion
and Connected by Continueus tep cast in - situ slab
tused in bridge decks). In Stu Contrete
RF
O O
Pecat
Prestressel
beams
T A
ransverse bars
is through hole in
Conpesite bridge deck. uith premst uebs.
Pre stessed elements.
ronsverse rse PresBrecsing can be done to develop monolithic
actioh.
Light weight longitudinal cores or voids in the space b/
Tee te reduce dead weight.
,For large spans greoter thon 8om, The commonly
used pre cast pre stessed Concrete untts consists o
Unsymmetrical T or box sections.
O
Use o prestresseal Concrete T-beam in RC Huss reduces
Cross sectional dimension o the bottom Chord member
in ttugses.
torge pon
Rei/brce Concrete and pre-stessed oncrefe ttusses use
for Span J-36m for industrial use)
Probbed Construction
When the cost in-situ part is Supporte by means o
additional subporis during the process hardening.
Jhis tyhe Construchion is referred te a the propped
onstrucion
fre-cast portion - Pre-stress SeH weight o
Precot
Compasite Section- ive leaol + Self weight of
Pre-Cost + Cat in- Situ) Cast in-situ slab
Onpropped Censtruction-
When the Cast üh- Sttu part Supported by the preca.st
part curing the process hardening.
Jhis tpe Consttucion is referred te,as the un-propped
Construcion.
Yre-cas portion- fre-stress + self weight etselH weight
Pre-cast cast
un-situ slab
Composite seetion
ive load
CPre-cast + Ct in-situ)
, Advantages of Composite Construction
Appreciable saving. in the cest o steel.
22) Sizes the Precast pertion Can be considerablt
reduced due te the eflect ol Composite a ction.
Lous rotis o size t pre cast part te that of
Composite member.
3) Low strength cohcrete can be effectively. used in the
Cast in - Situ part
4 t is idealt. suited for construchion ef deck slab tor
brid ges
5) Jhe pre cast porti on it sel Supports the p t in- situ part
curing tbe process e hardening, and thtuw the form ork
is almast eliminated Considering the above said factors,
Compasite Construction is found to be advantages and
etonomical. in the Caje ebridge construchion.
In Compoaite onslrucfion, a precOst pre-SHesed. pot is
USed in ombinahion uith a Cast n-Situ Part
Precast pre-sltessel mermbers uuith concrete cast-in-situ
be have as monelithic units under servie loads.
High 3trength Pre-StteSscl units are used in the tensish
2one and cast in-Situ in compresion zone.
DiHterentfal shrinkage between concrete ast in-sttu and
Pre-gre0e unit Contributes tor monelithic action.
Types of Composite Section -
Most Common - Snverted T beams placed side by side
-Distribuion
and Connected by Continueus tep cast in - situ slab
tused in bridge decks). In Stu Contrete
RF
O O
Pecat
Prestressel
beams
T A
ransverse bars
is through hole in
Conpesite bridge deck. uith premst uebs.
Pre stessed elements.
ronsverse rse PresBrecsing can be done to develop monolithic
actioh.
Light weight longitudinal cores or voids in the space b/
Tee te reduce dead weight.
,For large spans greoter thon 8om, The commonly
used pre cast pre stessed Concrete untts consists o
Unsymmetrical T or box sections.
O
Use o prestresseal Concrete T-beam in RC Huss reduces
Cross sectional dimension o the bottom Chord member
in ttugses.
torge pon
Rei/brce Concrete and pre-stessed oncrefe ttusses use
for Span J-36m for industrial use)
Probbed Construction
When the cost in-situ part is Supporte by means o
additional subporis during the process hardening.
Jhis tyhe Construchion is referred te a the propped
onstrucion
fre-cast portion - Pre-stress SeH weight o
Precot
Compasite Section- ive leaol + Self weight of
Pre-Cost + Cat in- Situ) Cast in-situ slab
Onpropped Censtruction-
When the Cast üh- Sttu part Supported by the preca.st
part curing the process hardening.
Jhis tpe Consttucion is referred te,as the un-propped
Construcion.
Yre-cas portion- fre-stress + self weight etselH weight
Pre-cast cast
un-situ slab
Composite seetion
ive load
CPre-cast + Ct in-situ)
, Advantages of Composite Construction
Appreciable saving. in the cest o steel.
22) Sizes the Precast pertion Can be considerablt
reduced due te the eflect ol Composite a ction.
Lous rotis o size t pre cast part te that of
Composite member.
3) Low strength cohcrete can be effectively. used in the
Cast in - Situ part
4 t is idealt. suited for construchion ef deck slab tor
brid ges
5) Jhe pre cast porti on it sel Supports the p t in- situ part
curing tbe process e hardening, and thtuw the form ork
is almast eliminated Considering the above said factors,
Compasite Construction is found to be advantages and
etonomical. in the Caje ebridge construchion.
