Bridges

Prof. Anthony Cioffi, P.E.

Professor/Chairman New York City College of Technology/CUNY

How are Bridges Used?

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Walkways Highways/Roads Railways Pipelines Connecting Lands Crossing Rivers Stadiums Roofs

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Arch

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Truss

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Cantilever Types of Bridges

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Cable-Stayed

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Suspension

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Beam

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Moveable

What Makes a Bridge Stay Up?

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Forces – 2 Types

1 st -

Compression > P ushing or Squeezing Force 2 nd Tension > P ulling or Stretching Force

Arch Bridges

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Keystone – the wedge shaped stone of an arch that locks its parts together Abutments the bridge – the structures that support the ends of

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Arch Bridges How Does it Work ? “ Compression”

Arch Bridges

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Where have you seen these bridges?

Bayonne Bridge – N.J.

Sydney Harbor Bridge Hoover Dam Bridge Apollo Bridge - Slovakia

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Steel Arch Bridge Where have you seen these bridges?

High Bridge (officially, the Aqueduct Bridge)

Bronx, N.Y.

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

Cable-Stayed Bridges

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Piers – Supports the Towers Towers – Support the Cables Cables – Thick Steel Ropes from which the decking is suspended Decking – Supports the Roadway

Tower Cable Deck Pier

Cable-Stayed Bridges

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How does it Work?

Tension & Compression

Cable-Stayed Bridges

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Where have you seen these bridges?

Abdoun Bridge – Amman, Jordan Puente de la Unida – Mexico Octavio Frias de Oliveira Bridge São Paulo - Brazil.

Zakim Bridge, Boston, MA

Sunshine Skyway Bridge, Tampa, FL

Suspension Bridges

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Similar to Cable-Stayed > Uses Cables for Support

Tower Cable Suspender Cable Deck Pier Abutment

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Suspension Bridge How does it Work?

Tension & Compression

Suspension Bridges

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Where have you seen these bridges?

Akashi Kaikyo Bridge - Japan Golden Gate Bridge – San Francisco Chesapeake Bay Bridge Virginia

Brooklyn Bridge, Brooklyn, NY

Verrazano-Narrows Bridge, New York City

Truss Bridge Support (Abutment)

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Truss Bridges How does Work? Tension & Compression

Truss Bridges

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Where have you seen these bridges?

Francis Scott Key Bridge Maryland, USA Betsy Ross Bridge – Philadelphia, PA

Under Truss Bridge

NY-79 Bridge Broome County, New York Warren

Truss Connections

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Cantilever Bridge Where have you seen these bridges?

Firth of Forth-Forth Rail Bridge Edinburgh, Scotland Bluewater Bridge -Port Huron Michigan

59 th Street Bridge – N.Y.C.

Pierre Pflimlin Bridge - France

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Beam Bridge Where have you seen these bridges?

Chesapeake Bay Bridge-Tunnel

Moveable Bridges Bascule Bridge Woodrow Wilson Bridge-Virginia London Bridge Swing Bridge Lift Bridge

Questions?

Build a Bridge Open the Secret Envelope!