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Building Bridges

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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Building Bridges

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  1. Building Bridges

  2. 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.

  3. A bridge in New South Wales, Australiaexample of truss system (rigid triangular framework)

  4. Forth Rail Bridgeexample of cantilever bridge

  5. Clachan Bridge, Isle of Seil“The Bridge over the Atlantic”example of stone arch bridge

  6. Pont Du Gard Roman Aqueducttriple arch bridge

  7. Corrieshalloch GorgeSuspension Bridge

  8. Golden Gate Bridge San Fransiscoexample of suspension bridge

  9. Akashi Kaikyo Bridge Japan(Longest single span in the world) 3-span 2-hinged truss-stiffened suspension bridge

  10. Oresund Bridge, linking Sweden and Denmark

  11. Lake Pontchartrain CausewayNew Orleans, LA

  12. 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

  13. Tacoma Narrows Bridge

  14. Tacoma Narrows Bridge

  15. Tacoma Narrows Bridge

  16. Tacoma Narrows Bridge

  17. Millenium Bridge, River Thames, London

  18. Millenium Bridge, River Thames, London

  19. 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

  20. 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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