How Building Design Changed After 9/11

When buildings collapse killing hundreds – or thousands – of people, it’s a tragedy. It’s also an important engineering problem. The 1995 collapse of the Alfred P. Murrah Federal Building in Oklahoma City and the World Trade Center towers in 2001 spawned many vows to never let anything like those events happen again. For structural […]

Photograph by New York Office of Emergency Management

9/11 WTC 7 Conspiracy Theory Debunked

Conspiracy Theory: Seven hours after the World Trade Center fell on September 11th 2001, the 47-story WTC 7 collapsed, but not due to a fire or the collapse of the nearby towers. Fact: Many conspiracy theorists point to FEMA’s preliminary report, which said there was relatively light damage to WTC 7 prior to its collapse. With […]

Why Did the Morandi Bridge Collapse, Killing 43 People?

Why did Italty’s Ponte Morandi (Morandi Bridge), built in 1967, collapse? The bridge was designed by Riccardo Morandi. It is similar to his earlier 1957 design for the General Rafael Urdaneta Bridge, located at the outlet of Lake Maracaibo in western Venezuela, which partially collapsed in 1964 when the tanker Esso Maracaibo collided with the […]