Making Skyscrapers Safer

Learning from the collapse of the World Trade Center towers, architects and engineers are beginning to design new features to make tall buildings safer.

September 30, 2001, 6:00 AM PDT

By Abhijeet Chavan @

Klemencic says engineers seeking good models of such a balance can look to England, where ongoing tension over Northern Ireland have forced a heightened vigilance against terrorist acts. In many of England's newer buildings, says Klemencic, the lower steel beams are reinforced in concrete. Steel is strong, but can bend under intense temperatures. Concrete holds up longer against heat, but can crack and break under extreme temperatures. Using both adds some protection against collapse during prolonged fire.

Thanks to Abhijeet Chavan

Friday, September 28, 2001 in ABC News


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