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Bridges Brian Brenner Aaron Levine Cindy Tran Some Uses of Bridges Walkways Highways/Roads Railways Pipelines Connecting lands Crossing rivers and canyons Types of Bridges Arch Truss Cantilever Cable-Stayed Suspension What makes a bridge stay up? Forces Compression – a pushing or squeezing force Tension – a pulling or stretching force Demonstration Make groups of two… Arch Bridges Keystone – the wedgeshaped 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 Engineering Engineering – the use of math and science to solve real world problems (like crossing a river) Civil engineering – designing and building bridges, roadways, tunnels, buildings, dams, etc. Civil Engineer Branches of Civil Engineering Structural – bridges, roads, buildings Geotechnical – foundations, excavations, and tunnels Transportation – roads, traffic control, airports Environmental – human impact on the environment Other Types of Engineering Mechanical – design machines and moving parts Electrical – design electrical equipment Chemical – design processes for mixing chemicals Computer – design computer hardware and software Questions?