Did you know that the Sears Tower (now renamed as the Willis Tower) is currently the tallest steel building in the world?
Tall steel buildings are possible thanks to Fazlur Khan, SOM engineer behind several innovations in terms of structural design. On Construction Week Online we found this list of the ten tallest steel buildings in the world, with Kahn's buildings on the 1st, 5th and 10th place.
All the buildings after the break:
Empire State Building