Bridges

Brian BrennerBrian Brenner

Aaron LevineAaron Levine

Cindy TranCindy Tran

Some Uses of BridgesSome Uses of Bridges

WalkwaysWalkways Highways/RoadsHighways/Roads RailwaysRailways PipelinesPipelines Connecting landsConnecting lands Crossing rivers and Crossing rivers and

canyonscanyons

Types of BridgesTypes of Bridges ArchArch

TrussTruss

CantileverCantilever

Cable-StayedCable-Stayed

SuspensionSuspension

What makes a bridge stay What makes a bridge stay up?up?

ForcesForces CompressionCompression – a – a

pushing or pushing or squeezing forcesqueezing force

TensionTension – a pulling – a pulling or stretching forceor stretching force

DemonstrationDemonstration Make groups of Make groups of

two…two…

Arch BridgesArch Bridges

KeystoneKeystone – the – the wedge-shaped stone wedge-shaped stone of an arch that locks of an arch that locks its parts togetherits parts together

AbutmentsAbutments – the – the structures that structures that support the ends of support the ends of the bridgethe bridge

Arch BridgesArch Bridges

Works byWorks by

CompressionCompression

Arch BridgesArch Bridges

Where have you seen these 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 BridgesCable-Stayed Bridges PiersPiers – the vertical supporting structures – the vertical supporting structures CablesCables – thick steel ropes from which the – thick steel ropes from which the

decking is suspendeddecking is suspended DeckingDecking – the supported roadway on a bridge – the supported roadway on a bridge

Cable-Stayed BridgesCable-Stayed Bridges

Works by Works by TensionTension AND AND CompressionCompression

Cable-Stayed BridgesCable-Stayed Bridges

Where have you seen these bridges?Where have you seen these bridges?

Zakim Bridge, Boston, MA

Sunshine Skyway Bridge, Tampa, FL

Sundial Bridge, Redding, CA

Suspension BridgesSuspension Bridges

Similar to Cable-StayedSimilar to Cable-Stayed Different construction methodDifferent construction method

Suspension BridgesSuspension Bridges

Works by Works by TensionTension and and CompressionCompression

Suspension BridgesSuspension Bridges

Where have you seen these bridges?Where have you seen these bridges?

Golden Gate Bridge, San Francisco, CA

Brooklyn Bridge, Brooklyn, NY

Verrazano-Narrows Bridge, New York, NY

Other TypesOther Types

Truss

Southern Pacific Railroad Bridge, Tempe, AZ

Cantilever

Firth of Forth-Forth Rail Bridge, Edinburgh, Scotland

EngineeringEngineering Engineering – the use of math and science to Engineering – the use of math and science to

solve real world problems (like crossing a river)solve real world problems (like crossing a river) Civil engineering – designing and building Civil engineering – designing and building

bridges, roadways, tunnels, buildings, dams, etc.bridges, roadways, tunnels, buildings, dams, etc.

Civil Engineer

Branches of Civil Branches of Civil EngineeringEngineering

Structural – bridges, roads, buildingsStructural – bridges, roads, buildings Geotechnical – foundations, Geotechnical – foundations,

excavations, and tunnelsexcavations, and tunnels Transportation – roads, traffic Transportation – roads, traffic

control, airportscontrol, airports Environmental – human impact on Environmental – human impact on

the environmentthe environment

Other Types of Other Types of EngineeringEngineering

Mechanical – design machines and Mechanical – design machines and moving partsmoving parts

Electrical – design electrical Electrical – design electrical equipmentequipment

Chemical – design processes for Chemical – design processes for mixing chemicalsmixing chemicals

Computer – design computer Computer – design computer hardware and softwarehardware and software

Questions?Questions?