bridge construction
TRANSCRIPT
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Presentation
Course: Steel StructureInstructor: Sir Waqar Ali
Class: BS CIVIL 7th semester
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Bridge Construction
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•Ahmed Zakaria
•Maaz Naqvi
•Shahrukh Aqiq
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What is a bridge?
Bridge is the structure which covers a gap
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Basic concepts of
bridges
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•Beam •Piers•Cantilever•Load
•Truss
•Stable•Deform
Basic Concept of Bridges
•Span•Force, Compression & Tension
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Basic Concept of Bridges
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Basic Concept of Bridges
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Basic Concept of Bridges
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Types of Bridges
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•Arch
•Truss
•Cantilever
•Cable-Stayed
•Suspension
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•Keystone – the wedge-shaped stone of an arch that locks its parts together
•Abutments – the structures that support the ends of the bridge
Arch Bridge
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•Works byCompression
Arch Bridge
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Marsh Rainbow Arch, Riverton, KSRailway Arch Bridge
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•Piers – the vertical supporting structures•Cables – thick steel ropes from which the
decking is suspended•Decking – the supported roadway on a
bridge
Cable Stayed Bridge
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Cable Stayed Bridge
•Works by Tension AND Compression
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Zakim Bridge, Boston
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Suspension Bridges
•Similar to Cable-Stayed•Different construction method
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Suspension Bridges
•Works by Tension and Compression
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Golden Gate Bridge, San Francisco, CA
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Other TypesTrussSouthern Pacific Railroad Bridge, Tempe, AZ
CantileverFirth of Forth-Forth Rail Bridge, Edinburgh, Scotland
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Now maaz
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FOUNDATION
A foundation is the lowest and supporting layer of a structure
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•Shallow Foundation•Deep Foundation
Foundation are generally divided into two categories:
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Shallow Foundation
•Pad Foundation
•Strap Foundation
•Raft Foundation
There are variety of shallow foundation types used in construction of foundation columns .
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Deep FoundationDeep Foundation are those foundation in which the depth of the foundation is very large in comparison to its width
Types of deep foundation
•Deep Strip
•Pile Foundation
•Pier Foundation
•Well Foundation
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Pile Foundation
•Pile Foundation may be defined as a column support type of foundation
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Types of Pile
1. Bearing piles.2. Friction piles.3. Sheet piles.4. Fender piles.5. Anchor piles.
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Bearing Pile
•Bearing Piles are those which are driven into ground until the hard stratum is reached.
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Friction piles
• These are the piles which bear the load of the structure by its skin friction developing by soil and the surrounding soil.
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Sheet Piles
Sheet piling is an earth retention and excavation support technique that retain soil
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Fender Piles
• Harbor Piles excel when used in foundering applications.
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Anchor Piles.
•These are the piles which provide anchorage against horizontal pulls and thrusts
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Now shahrukh
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Causes ofBridges Failure
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Reasons Why Bridge Collapse
10 Earth Quake
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09 Fire
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08 Train Crash
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07 Boat Impact
the Judge William Seeber Bridge in New Orleans in 1993. The bridge carried road traffic over a canal, and a barge passing under the bridge struck a pier
supporting the bridge and severed it. Nearly 150 feet (46 meters) of bridge collapsed as a result
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06 Flood
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The Quebec Bridge collapsed twice during construction before finally
being built
05 Construction Error
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04 Manufacturing Defects
03 Design Defects
Sometimes, bridges collapse due to design flaws
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02 Poor maintenance
01 Odd occurrence
Some bridge collapses just can't be explained at all.
A bridge carrying the Connecticut Turnpike over the Mianus River collapsed in the middle of the night in June 1983
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ANY QUESTION?