uruk
Philosopher
- Joined
- Apr 9, 2003
- Messages
- 5,311
The Tacoma bridge disaster had nothing to do with the steel (except that it's maximum stress load was exceeded). It had to do with the design. Most steel bridges have open lattice beam trusses that allowed the wind to pass through. The Tacoma Narrows bridge had plate girders that caused the wind to divert abouve and below the bridge that set up the oscillations.
http://en.wikipedia.org/wiki/Tacoma_Narrows_Bridge
The WTC tower's steel "tube with in tube" and floor truss was designed to resist the wind load.
http://guardian.150m.com/wtc/small/eng-news-record.htm
Scroll down to where it says:
HOW COLUMNS WILL BE DESIGNED FOR 110-STORY BUILDINGS
http://en.wikipedia.org/wiki/Tacoma_Narrows_Bridge
The WTC tower's steel "tube with in tube" and floor truss was designed to resist the wind load.
http://guardian.150m.com/wtc/small/eng-news-record.htm
Scroll down to where it says:
HOW COLUMNS WILL BE DESIGNED FOR 110-STORY BUILDINGS
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