Bridges.

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Presentation transcript:

Bridges

Some Uses of Bridges Walkways Highways/Roads Railways Pipelines Connecting lands Crossing rivers and canyons

Types of Bridges Arch Truss Cable-Stayed Suspension

What makes a bridge stay up? Forces Compression – a pushing or squeezing force Tension – a pulling or stretching force Demonstration

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

Arch Bridges Works by Compression

Arch Bridges Where have you seen these bridges?

Cold Spring Arch Bridge, Santa Barbara, CA

Marsh Rainbow Arch, Riverton, KS

Pont du Gard, Nimes, France

Cable-Stayed Bridges Piers – the vertical supporting structures Cables – thick steel ropes from which the decking is suspended Decking – the supported roadway on a bridge

Cable-Stayed Bridges Works by Tension AND Compression

Cable-Stayed Bridges Where have you seen these bridges?

Zakim Bridge, Boston, MA

Sunshine Skyway Bridge, Tampa, FL

Sundial Bridge, Redding, CA

Suspension Bridges Similar to Cable-Stayed Different construction method

Suspension Bridges Works by Tension and Compression

Suspension Bridges Where have you seen these bridges?

Golden Gate Bridge, San Francisco, CA

Brooklyn Bridge, Brooklyn, NY

Verrazano-Narrows Bridge, New York, NY

Other Types Truss Southern Pacific Railroad Bridge, Tempe, AZ Cantilever Firth of Forth-Forth Rail Bridge, Edinburgh, Scotland