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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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Physics of bridge building l.jpg
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 l.jpg
A bridge in New South Wales, Australiaexample of truss system (rigid triangular framework)


Forth rail bridge example of cantilever bridge l.jpg
Forth Rail Bridgeexample of cantilever bridge


Clachan bridge isle of seil the bridge over the atlantic example of stone arch bridge l.jpg
Clachan Bridge, Isle of Seil“The Bridge over the Atlantic”example of stone arch bridge


Pont du gard roman aqueduct triple arch bridge l.jpg
Pont Du Gard Roman Aqueducttriple arch bridge


Corrieshalloch gorge suspension bridge l.jpg
Corrieshalloch GorgeSuspension Bridge


Golden gate bridge san fransisco example of suspension bridge l.jpg
Golden Gate Bridge San Fransiscoexample of suspension bridge


Akashi kaikyo bridge japan longest single span in the world l.jpg
Akashi Kaikyo Bridge Japan(Longest single span in the world)

3-span 2-hinged truss-stiffened suspension bridge


Oresund bridge linking sweden and denmark l.jpg
Oresund Bridge, linking Sweden and Denmark



Some physics considerations l.jpg
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 l.jpg
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 l.jpg
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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