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Unit-3
T-beam bridge
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Most commonly adopted type Span range 10 to 25 m
Deck slab cast monolithically with girders
Types of T-beam bridge
1.Slab girder bridge
No cross beams Slab design as a one way slab Does not possess mch torsional rigidity This type is not adopted in recent designs
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2. T-beam bridge With diaphragms
Diaphragms connecting the longitdinal girders
!t do not e"tend p to the slabSlab remain beha#es as an one way slab$reater torsional rigidity than the girder-slab type
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3. T-beam bridge With cross beam
%ast monolithically with desk slab Slab design as a two way slab Slab thickness redces Dead load on longitdinal girder redce !etter load distribtion on longitdinal girders &ncrease spacing of longitdinal girders 'ence less nmber of girders %ost redce
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No crossbeam
Withdiaphragm
With crossbeam
de(ection 100) *+) ,)
.oad distribtion /oor !etter best
ltimate loadcapacity
100) 12) 1,2)
iment investigation was conducted under the supervision o th
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#omponents o a T-$eam$ridge
1 Deck slab2 %antile#er portion ootpaths 3 if pro#ided4kerbs and handrails+ .ongitdinal girders5 %ross beam or diaphragms
, earing corse
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Some standard details
6erb #ary from +*5 mm to ,00 mmearing corse thickness for asphaltic concrete -5, mm for cement concrete-*5 mootpaths abot -15 m
Number and spacing o main girders
Three girders applicable for two-lane carriage way of *5 m width or girders for 12 m width
.ateral spacing of the longitdinal girders will a7ect the cost of the bridge Three girders system is sally more economic than a for girder system foa bridge width of 8* m
#ross-beam%ross beam are pro#ided mainly to sti7en the girders and to redce torsion in
9"terior girders
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!esign components
1 Deck slab
2 9nd longitdinal girder &ntermediate longitdinal girder+ 9nd cross beam5 &ntermediate cross beam, %antile#er portion
Design steps* Design data8 !M de to dead load: !M de to li#e load10 Design !M11 Main reinforcement12 Distribtion reinforcement
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ma"imm !M nder any wheel load occrs when the center of the span is miween the %$ of load system and the wheel load nder consideration
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2
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!o" cl#ertlvertis a strctre that allows water to (ow nder a road4 railroad4 trail4 or simiction from one side to the other side Typically embedded so as to be srronil4 a cl#ert may be made from a pipe 4 reinforced concrete or other material
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omponents of bo" cl#ertTop slab
Side walls!ottom slab
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sign .oads
oncentrated loadsniform Distribted load
eight of side wallsater pressre inside walls
9arth pressre on =ertical Side wallniform .ateral .oad on Side alls
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