Wednesday, October 27, 2010

"Flexible" design (Willis Tower)

Inside Chicago's Willis/Sears Tower - creaking sounds (mp3) when the tall building sways in the wind. The swaying is by design - to help it cope with the structural stresses it encounters at the top, from strong winds in stormy weather.

A little short of half a kilometer in height and one of the tallest buildings in the world. Now, that is extreme engineering!