BridgesProf. Anthony Cioffi, P.E.Professor/ChairmanNew York City College of Technology/CUNY

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How are Bridges Used?WalkwaysHighways/RoadsRailwaysPipelinesConnecting LandsCrossing Rivers StadiumsRoofs

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Types of BridgesArch

Truss

Cantilever

Cable-Stayed

Suspension

Beam

Moveable

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What Makes a Bridge Stay Up?Forces 2 Types

1st - Compression > Pushing or Squeezing Force

2nd - Tension > Pulling or Stretching Force

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Arch BridgesKeystone the wedge-shaped stone of an arch that locks its parts togetherAbutments the structures that support the ends of the bridge

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Arch BridgesHow Does it Work ? Compression

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Arch BridgesWhere have you seen these bridges?

Bayonne Bridge N.J.Sydney Harbor BridgeHoover Dam BridgeApollo Bridge - Slovakia

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High Bridge (officially, the Aqueduct Bridge) Bronx, N.Y.Steel Arch BridgeWhere have you seen these bridges?

Hell Gate Arch Bridge, New York, Connecting Railroad Bridge from Queens

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Cable-Stayed BridgesPiers Supports the Towers Towers Support the CablesCables Thick Steel Ropes from which the decking is suspendedDecking Supports the Roadway

PierCableTowerDeck

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Cable-Stayed BridgesHow does it Work?

Tension & Compression

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Cable-Stayed BridgesWhere have you seen these bridges?

Abdoun Bridge Amman, JordanPuente de la Unida MexicoOctavio Frias de Oliveira BridgeSo Paulo - Brazil.

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Zakim Bridge, Boston, MA

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Sunshine Skyway Bridge, Tampa, FL

Suspension BridgesSimilar to Cable-Stayed

> Uses Cables for Support

TowerCableAbutmentDeckSuspender Cable

Pier

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Suspension Bridge

How does it Work?

Tension & Compression

Suspension BridgesWhere have you seen these bridges?

Akashi Kaikyo Bridge - Japan

Golden Gate Bridge San FranciscoChesapeake Bay BridgeVirginia

Brooklyn Bridge, Brooklyn, NY

Verrazano-Narrows Bridge, New York City

Truss Bridge

Support (Abutment)

Truss BridgesHow does Work? Tension& Compression

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Truss BridgesWhere have you seen these bridges?

Francis Scott Key Bridge - Maryland, USABetsy Ross Bridge Philadelphia, PA

Under Truss Bridge

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NY-79 BridgeBroome County, New YorkWarrenTruss Connections

Cantilever BridgeFirth of Forth-Forth Rail BridgeEdinburgh, ScotlandWhere have you seen these bridges?

Bluewater Bridge -Port Huron Michigan

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59th Street Bridge N.Y.C.Pierre Pflimlin Bridge - France

Beam BridgeChesapeake Bay Bridge-TunnelWhere have you seen these bridges?

Moveable BridgesBascule BridgeWoodrow Wilson Bridge-VirginiaSwing BridgeLift BridgeLondon Bridge

Questions?

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Build a BridgeOpen the Secret Envelope!

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VerticalBottom Chord

Diagonal

End Post

Hip Vertical

Deck

Top Chord

VerticalBottom Chord

Diagonal

End Post

Hip Vertical

Deck

Top Chord