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HOW HOW BRIDGES BRIDGES
WORKWORK
THE BASICSTHE BASICS
Dimensions?Dimensions? Purpose?Purpose? Type?Type? Design?Design? $$$$$$?$$$$$$?
Civil EngineerCivil Engineer
BridgesBridges CanalsCanals RoadsRoads
Civil EngineerCivil Engineer Water/Wastewater systems (sewers)Water/Wastewater systems (sewers) FoundationsFoundations Tunnels`Tunnels` AirportsAirports
BEAM BRIDGEBEAM BRIDGE
A horizontal A horizontal structure resting on structure resting on piers. piers.
Weight supported Weight supported by piers.by piers.
Constructed using Constructed using concrete/steel.concrete/steel.
TYPES OF BEAM BRIDGESTYPES OF BEAM BRIDGES
TRUSS – a structure consisting of 1 or more triangular units whose ends are connected.
TRUSS FORCESTRUSS FORCES
• Truss members experience BOTH tension and compression
• Top and bottom members experience MORE force than the center members
•Truss is rigid and can dissipate the weight throughout the structure.
ARCH BRIDGEARCH BRIDGE Semi-circular structure Semi-circular structure
with abutments on each with abutments on each end.end.
ALWAYS UNDER ALWAYS UNDER COMPRESSIONCOMPRESSION
The shape of the structure The shape of the structure dissipates the weight.dissipates the weight.
Pont du Gard – Vers Pont du Gardc. 19BC-60AD
SUSPENSION BRIDGESUSPENSION BRIDGE Cables are strung across Cables are strung across
multiple towers and the deck multiple towers and the deck is suspended from these is suspended from these cables. Cables are held in cables. Cables are held in place by anchor blocksplace by anchor blocks
Cables are under tension, Cables are under tension, towers are under compressiontowers are under compression
NAME THE BRIDGENAME THE BRIDGE
Newport Bridge – Newport, RIJune 28, 1969
NAME THE BRIDGENAME THE BRIDGE
Tower Bridge – London, England1894
NAME THE BRIDGENAME THE BRIDGE
Sydney Harbor Bridge – Sydney, Australia1932
NAME THE BRIDGENAME THE BRIDGE
Magdeburg Water Bridge – Elbe River, GermanyOctober, 2003
NAME THE BRIDGENAME THE BRIDGE
The Millennium Bridge – London, EnglandJune 2000
Balsa Wood BridgeBalsa Wood BridgeJeff Cathcart???