Ppt bridges & types
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Transcript of Ppt bridges & types
![Page 1: Ppt bridges & types](https://reader031.fdocuments.in/reader031/viewer/2022012313/589c22951a28ab65248b49ed/html5/thumbnails/1.jpg)
BRIDGES AND ITS TYPES
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DEFINITION OF BRIDGE
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Components of bridge Substructure:• Piers and Abutments• Wing walls and Returns• Foundation Bearings Superstructure or Decking
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Substructure:
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Bearings
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Superstructure or Decking
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TYPES OF
BRIDGES
SLAB
BEAM
ARCH
SUSPENSION
CABLE-STAYED
GIRDER
TRUSS
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Type of superstructures• Slab (9m)
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ADVANTAGES & DISADANTAGES
• Minimum depth for short spans
• Ease of design and detail
• Aesthetic for small stream crossings
• Not the most economical solution
• Requires formwork structure
• Limited span length
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Beam (10 to 60m)
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ADVANTAGES & DISADANTAGES
• Helpful for short spans.
• Long distances are normally covered by placing the beams on piers
• Costly even for rather short spans, since expensive steel is required as a construction material
• Sagging tendency is increased when the bridge span or load is increased.
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Girder (10 to 60m)
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ADVANTAGES & DISADANTAGES• Fairly simple• Easy to install and
maintain• Extremely rugged• Small deflections
• low strength to weight ratio
• Plate girders have limited spans
• Limited visibility through the structure
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Truss• Simply supported (30 to 375m)• Cantilevered combination
(550m)
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ADVANTAGES & DISADANTAGES• Economical To
Build• Very Strong• Road Placement• Built In Difficult
Places
• Complicated Design
• Maintenance• Waste of Materials• Very Heavy
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Arch• Small Spans (3 To 15m)• Steel Arch (519m) • Concrete Arches (305m)
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ADVANTAGES & DISADANTAGES• Provide Higher
Levels Of Resistance
• Made From Virtually Anything
• Stronger The More They Work
• Spans Of The Bridge Are Limited
• Require Extra Maintenance
• Take A Long Time To Build
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Suspension (500m up to 1400m)
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ADVANTAGES & DISADANTAGES• Span of Great
Lengths• Flexibility• Simple
Construction
• Soft Ground Issues• Too Flexible• Cannot Support
High Traffic
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Cable stayed(300 to 600m)
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ADVANTAGES & DISADANTAGES• Good for medium
spans• Greater stiffness• Can be constructed
by cantilevering out from the tower
• Cables won't break under extreme temperature
• Typically more expensive than other types of bridge
• Wind is a big factor. It can rock the bridge side to side, causing the cables to become lose
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Classification of bridges Flexibility of superstructure• Fixed span superstructure• Movable span bridges
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Position of bridge floor relative to the formation level• Deck bridges• Through bridges• Semi through bridges
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Inter-span relations• Simply supported• Continuous• Cantilever
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Method of clearance for navigation• Movable – Bascule Bridge• Movable – Swing Bridge• Movable – Lift Bridge• Transporter
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Expected utility period of service• Temporary bridges• Military (pontoon, bailey)• Permanent bridges
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Road level relative to the highest flood level• Causeway• High-level• Submersible
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BRIDGE MAINTAINENCE• Locating voids and delamination's in bridge
pavements and scour around bridge support columns.
• Determining location and types of reinforcing steel in concrete
Ensuring quality control on new concrete installations
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Corrosion Control • Protective Coatings• Barrier Coatings • Metallizing
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Noise barriers• Security fencing• Bridge mounted • Roof mounted
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THANK
YOU