The Safer Skyscraper

"Astaneh said the towers might have withstood the attack had they been reinforced properly with 6-inch-thick concrete-and-steel shear walls. The shear walls could be installed in both existing and new buildings in order to strengthen their regular exterior skin. Such reinforcement would cover the giant expanses of clear glass that are the hallmark of many modern buildings. But the materials could be designed to allow smaller windows. The idea is to create a tough outer membrane sufficient to withstand the shock of a direct impact and minimize the amount of jet fuel that squirts into a building."

Thanks to Design Architecture