Bridges Past Present Future
Bridges Past Present Future
Bridges Past Present Future
Future
Dr. Lisa Spainhour
Dept. of Civil and Environmental Eng.
FAMU-FSU College of Engineering
Bridge BasicsTypes
Five main types of bridges
Beam bridge
Truss bridge
Arch bridge
Cable-stayed bridge
Suspension bridge
Bridges may combine different types
Beam Bridges
Simple
tension
Cantilever span: top in tension, bottom in compression
Best for spans < 1000, requires many supports to
cross a long distance
Beam BridgesTypes
Beam BridgesExamples
Stone footbridges
Beam BridgesExamples
I-540/I-70 Interchange, NC
Lincove Viaduct, NC
I-44, 16th St. Overpass, OK
Truss Bridges
Simple truss
Overall
Cantilever truss
Truss BridgesTypes
Truss BridgesExamples
Stillwater Bridge, MN
Kingston-Rhinecliff Bridge, NY
Arch Bridges
Under
Arch BridgesTypes
Arch BridgesExamples
Thomas Aqueduct,
MD (1835)
Arch BridgesConstruction
Bayonne Bridge, NJ
Willamette River Bridge, OR
Suspension Bridges
Cables
Suspension BridgesExamples
Suspension BridgesExamples
Humber Bridge,
England
Golden Gate Bridge,CA
Brooklyn Bridge, NY
Galloping Gertie
After Failure
Replacement Bridge
Cable-Stayed Bridges
Cables
under tension
Towers, deck under compression (w/post-tensioning)
No end anchorages, require less cable, and are faster to
build than suspension bridges
Best for spans of 1000 to 3000.
Cable-Stayed BridgesExamples
Sunshine Skyway, FL
Clark Bridge, IL
Cable-Stayed BridgesExamples
Santarem-Almeirim
Bridge, Portugal
Salzburg, Austria
Cable-Stayed BridgesExamples
Leonard P. Zakim Bunker Hill
Bridge,
Over Charles River
Boston, MA
Bridge BasicsMaterials
Past
Stone
Timber*
Iron
Present
Steel*
Steel-Reinforced Concrete
Prestressed Concrete*
Future
Those with asterisks
Fiber-Reinforced
Polymers (FRPs)
???
Bridge MaterialsFRP
No-Name Creek
Bridge, Kansas
FootbridgesEntirely FRP
Fiberline
Bridge,
Denmark
Aberfeldy
Footbridge,
Scotland
Parsons Bridge,
Wales
Unknown
Stress-Laminated Bridge
Decks
Short lengths of treated
wood run lengthwise
Steel or FRP rods crosswise
through holes in deck
Stressing the rods puts steel
in tension, timber in
compression. Creates
strong, stiff deck.
Summary/Questions
Four main factors define a bridge
bridge?