Posted by d on September 15, 2002 at 19:22:16:
In Reply to: WTC structure posted by Paul Dremann on September 14, 2002 at 06:31:22:
When I did a cursory internet search last fall on the Visco-Elastic Damper, what I found was a tremendous number of studies, mainly by Asian architects, I believe, on its use in systems to counter earthquake shock...
This makes me wonder if Yamasaki was, in some way, experimenting a bit in the WTC design, with a mechanism which could be translated for use in earthquake-prone areas.
To put it another way- the towers were very tall, lightweight construction with a noticeable absence of diagonal strengthening elements; wind-induced sway was therefore almost a given.
But why deliberately design a tower so that it would sway and oscillate?
It's hard to aswer- unless the building were actually a test-platform for anti-sway techniques...
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