NIST Video: Why the Building (WTC7) Fell

The video discusses the collapse of the World Trade Center Building 7 on September 11th, attributed to fire-induced progressive collapse, a phenomenon identified by the National Institute of Standards and Technology (NIST). The collapse was modeled using complex computer simulations, showing that heat from fires caused structural failures. NIST found no evidence of explosives, as no loud sounds were detected. The building's design met codes at the time, but the event highlighted the need for stronger building codes and reevaluation of fire performance in structures with long-span floors.

What was the primary cause of the collapse of World Trade Center Building 7 according to the investigation?

Describe the type of collapse that was discovered in the investigation of World Trade Center 7.

What evidence did the NIST team use to validate their computer model of the collapse?

What did the NIST team conclude about the involvement of explosives in the collapse of World Trade Center 7?

What recommendations did the NIST team make to prevent similar collapses in the future?