WTC investigators issue skyscraper recommendations

Goal: to create buildings that achieve burnout without collapse

NEW YORK : The United States should update fire standards for skyscrapers in light of the World Trade Center collapse and develop new materials that can better protect tall buildings in an inferno, investigators said Thursday.Engineers with the National Institute of Standards and Technology also urged installation of "fire-protected and structurally hardened elevators" to improve emergency response in tall buildings."Such elevators should be installed for exclusive use by emergency responders during emergencies," NIST said in its draft recommendations on the twin tower collapse, released at a news briefing in Lower Manhattan.