TEST TO SEE IF LINKS WORK

http://www.icivilengineer.com/category/famous-engineers/ http://www.icivilengineer.com/ How to make a poster http://www.ncsu.edu/project/posters/ Videos http://www.youtube.com/watch?v=ZQ3L8rlf9IM&list=PLQYPRVJgjEZZd9EAqwml53ziYOqIdQpJ3

Tacoma Bridge

http://www.youtube.com/watch?v=3mclp9QmCGs To 1minute in to video. Bridge twisting due to resonance vibration.

Torsional forces at work leading to almost inevitable scene below.

Jump to 3mintues for centre span collapse.