Slab girder bridge

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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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Slab girder bridge

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