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Building Bridges. Physics of Bridge Building. Three basic types Span : simplest form – beam supported on vertical supports. Also truss bridge, cantilever bridge Arch : compression forces push outwards horizontally against the supports

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Presentation Transcript
physics of bridge building
Physics of Bridge Building
  • Three basic types
    • Span: simplest form – beam supported on vertical supports. Also truss bridge, cantilever bridge
    • Arch: compression forces push outwards horizontally against the supports
    • Suspension: main cables anchored to towers, suspender cables support roadway. Cables are in tension.
a bridge in new south wales australia example of truss system rigid triangular framework
A bridge in New South Wales, Australiaexample of truss system (rigid triangular framework)
clachan bridge isle of seil the bridge over the atlantic example of stone arch bridge
Clachan Bridge, Isle of Seil“The Bridge over the Atlantic”example of stone arch bridge
akashi kaikyo bridge japan longest single span in the world
Akashi Kaikyo Bridge Japan(Longest single span in the world)

3-span 2-hinged truss-stiffened suspension bridge

some physics considerations
Some Physics Considerations
  • Choice of material
    • Strength:

in tension, compression, bending, torsion

  • Shape of framework
    • (why triangular?)
  • Testing the design – use of models
    • Physical scale models
    • Computer models
the bridge competition
The Bridge Competition
  • You are a team of bridge designers working for the internationally known bridge building company ………………………………………….

(choose a name for your company)

  • Your task is to design and build a single span bridge to the specifications given on the sheet, using the materials provided.
  • The bridges will be judged on three categories
    • Technical Merit
    • Artistic Impression
    • Weight
technical specifications
Technical specifications

Single-track car deck (made from card)

Coke can (full)

Makes bridge bend by less than 2cm at the centre

<30°

>10cm

>90cm

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