Bridges
Engineering Design
Mrs. Hodgson
Materials
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Steel
Beams
 Cables
 Connections
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Concrete
Roadway
 Beams
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Stone
Wood
What do bridges Carry?
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Cars, Trucks, Motorcycles, etc…
Trains
People
Pipes – gas, water, electric wires, etc…
Extreme Loads - earthquakes/wind/impacts
All of these are “Live Loads”
Self-weight is “Dead Load”
Types of Bridges

Girder
Simple spans
 Continuous spans

Girder Bridge
Simple Span
Simple Span
Continuous Spans
Girder Bridge
How many spans do you see?
Types of Bridges

Girder
Simple spans
 Continuous spans
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Truss
Through truss
 Pony truss
 Deck truss
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What is a Truss?
Truss Types: Bridges
Through
Truss
Pony
Truss
Deck
Truss
Bridge Truss Types
Truss Bridges
Vertical
Top Chord
Bottom Chord
Truss Bridges
Trusses
Truss Bridges
Victory Bridge
Truss Bridges
SR33 Bridge
Northampton County, PA
Types of Bridges

Girder
Simple spans
 Continuous spans


Truss
Through truss
 Pony truss
 Deck truss
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Arch
Tied arch
 Fixed arch
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Fixed Arch
Tied Arch
Arch Bridges
Cold Spring Arch Bridge
Santa Barbara, CA
Fixed arch
Arch Bridges
Birmingham Bridge
Pittsburgh, PA
Tied Arch
Fort Duquesne Bridge
Pittsburgh, PA
Tied Arch
Types of Bridges

Girder
Simple spans
 Continuous spans


Truss
Through truss
 Pony truss
 Deck truss

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Arch
Tied arch
 Deck arch
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Cable-stayed
Cable-stayed Bridges
Cable-stayed Bridges
Sunshine Skyway
Tampa Bay, FL
Millau Viaduct
France
Types of Bridges

Girder
Simple spans
 Continuous spans
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Truss
Through truss
 Pony truss
 Deck truss
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
Arch
Tied arch
 Deck arch
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Cable-stayed
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Suspension
Suspension Bridges
Bay Bridge
San Francisco, CA
Manhattan Bridge
New York, NY
Suspension Bridges
Bronx-Whitestone Bridge
New York, NY
Golden Gate Bridge
San Francisco, CA
Suspension Bridges
Brooklyn Bridge
New York, NY
Verrazano Narrows Bridge
New York, NY
Mixed Bridge Types
Brooklyn Bridge
Foundations
Questions?