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Bridges!

Bridges!. Or How to get across a big gaping hole. Safely. Sometimes…. Why are bridges different?. What is the point of having different styles?. Want to get from here to here. Europe’s oldest covered bridge. Lucern Switzerland – 1333! That is pretty old….

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Bridges!

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  1. Bridges! Or How to get across a big gaping hole. Safely. Sometimes…

  2. Why are bridges different? • What is the point of having different styles?

  3. Want to get from here to here

  4. Europe’s oldest covered bridge • Lucern Switzerland – 1333! That is pretty old…

  5. Some idiot set it on fire in 1993 while smoking

  6. Rebuilt and the woodentimberframing is amazing!

  7. Different areas need different bridges • Relatively short spans you can have an Arch Bridge • This is in Ironbridge villiage England

  8. It was the world’s first cast iron bridge - 1779

  9. Beam bridges • Horizontal beams supported at each end by piers. The first ones were pretty simple.

  10. Each end is supported and the force applied is pressing down on those points

  11. Cantilever Bridge • Is built using cantilevers, beams that project horizontally into space, supported on only one end

  12. They figured out this out in the 19th Century

  13. Forces

  14. Suspension Bridge • Suspended from cables. The cables hang from towers that are attached to caissons.

  15. Forces

  16. Tacoma Narrows Suspension Bridge • Opened in 1940

  17. Collapsed 4 months later Due to it being very very narrow and wind vibration http://www.youtube.com/watch?v=3mclp9QmCGs

  18. Cablestay Bridge • Is a bridge that consists of one or more columns (normally referred to as towers or pylons), with cables supporting the bridge deck

  19. It looks a lot like a Suspension Bridge but the key difference is the cables form a “fan shape” rather than a curve. Is a hybrid of a Suspension and Cantilevered Bridge

  20. Forces

  21. Truss Bridge • One of the oldest and easy to produce for cost, time and effort. Great for short distances

  22. Really popular 1870’s – 1930’s

  23. Forces and construction

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