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

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Presentation transcript:

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

Some idiot set it on fire in 1993 while smoking

Rebuilt and the wooden timberframing is amazing!

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

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

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

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

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

They figured out this out in the 19th Century

Forces

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

Forces

Tacoma Narrows Suspension Bridge Opened in 1940

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

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

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

Forces

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

Really popular 1870’s – 1930’s

Forces and construction