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?
