ExtraExtra largelarge SpanSpan :: overover 150150...

Extra large Span : over 150 m.Extra large Span : Extra large Span : over 150 m.over 150 m.Consists of (1) Arch Truss, (2) Cable stayed bridge, and (3) Suspension bridge

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Slab typeSlab typeSlab typeo This is the most simplest type of concrete bridge.o Effective length is about 5 to 10 m.


SlabGirders bridgeSlabSlabGirders bridgeGirders bridge

o The deck is supported on stringers that are themselves supported on abutment or piers.

o The concrete slab can be cast eithernoncompositely or compositely, with stringers of steel, RC, or PC.


Truss bridgeTruss bridgeTruss bridge

Truss bridges are also described in relation to position of the floor relative to upper or lower panel points of truss.


Truss bridge (2)Truss bridge Truss bridge (2)(2)

Through Truss Through Truss Half through Truss Half through Truss Deck Truss Deck Truss

(โครงลง) (โครงปด) (โครงเปด)


Rigid FrameRigid FrameRigid FrameRigid frame bridges consists of superstructures supported on vertical or slanted monotonic legs, and are economically suitablefor moderate medium‐span length


Rigid Frame (2)Rigid Frame Rigid Frame (2)(2)


Arch BridgeArch BridgeArch Bridge

o A true arch transfers loads to its foundation by pure compression; however, the variable position of the live load always causes superimposed bending.


Arch Bridge (2)Arch Bridge Arch Bridge (2)(2)


Arch Bridge (3)Arch Bridge Arch Bridge (3)(3)


Cantilever bridgeCantilever bridgeCantilever bridge

o

Cantilever bridges were the answer for long‐span railway bridge in the late 1800s.

o They displayed the strength, rigidity, and sturdiness required to carry the heavy railroadthat caused large deflections in the truss bridges.


Cantilever bridge (2)Cantilever bridge Cantilever bridge (2)(2)


Extradosed bridgeExtraExtradosed bridgedosed bridgeThere is a hybrid between boxgirder

and cable stayed bridge.


Cable stayed bridgeCable stayed bridgeCable stayed bridgeo Cable stayed bridges are very competitive economically for medium and long spans.


Cable stayed bridge (2)Cable stayed bridge Cable stayed bridge (2)(2)


Main Cable

Suspender

Floor beam& sway frame

Stiffness Truss

SECTIONSECTION

Suspension BridgeSuspension BridgeSuspension Bridgeo Suspension bridge are recognized for spanning the longest distances and for their superior aesthetics.


Suspension Bridge (2)Suspension Bridge Suspension Bridge (2)(2)


Stress Ribbon bridgeStress Ribbon bridgeStress Ribbon bridge

“Stressribbon bridges”

is the term used to describe structures formed by a very slender concrete deck in the shape of a

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Bowstring bridgeBowstring bridgeBowstring bridge


Vierendeel BridgeVierendeel BridgeVierendeel Bridge


Lenticular

BridgeLenticularLenticular

BridgeBridge


Aqueduct BridgeAqueduct BridgeAqueduct Bridge


Simple span bridgeSimple span bridgeSimple span bridge


Continuous spanContinuous spanContinuous span


Cantilever span and over hangCantilever span and over hangCantilever span and over hang


UtilityUtilityUtility


Lift


Lift (2)


Swing


Bascule


Draw


Incline


Merge


Slide and fold bridge


Floating bridge


Double decksDouble decksDouble decks


Double decks (2)Double decks Double decks (2)(2)


BELOW DECK

LOWER SIDE BY SIDE

UPPER SIDE BY SIDE

Multiple decksMultiple decksMultiple decks


Below the deck lineBelow the deck lineBelow the deck line

o Arch and truss‐arch bridges are included in this classification.


Above the deck lineAbove the deck lineAbove the deck line

o Suspension, Cable, and through – truss are included in this category.


Coincides with deck lineCoincides with deck lineCoincides with deck line

o Girder bridges of all types are included in this category.


ExtraExtra largelarge SpanSpan :: overover 150150...

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