Computer Models

NIST and the Computer Models

NIST and the Computer Models

“World Trade Center disaster investigators [at NIST] are refusing to show computer visualizations of the collapse of the Twin Towers despite calls from leading structural and fire engineers, NCE has learned. Visualisations of collapse mechanisms are routinely used to validate the type of finite element analysis model used by the [NIST] investigators.” Parker, Dave. "WTC investigators resist call for collapse visualisation," New Civil Engineer, October 6, 2005.

“The Investigation Team then defined three cases for each building by combining the middle, less severe, and more severe values of the influential variables. Upon a preliminary examination of the middle cases, it became clear that the towers would likely remain standing. The less severe cases were discarded after the aircraft impact results were compared to observed events. The middle cases… were discarded after the structural response analysis of major subsystems were compared to observed events.” NIST, 2005, p. 142; emphasis added.

NIST releases some of the Computer Models for a Fee.

Some of the Computer models have been released according to this person and the ones he acquired are available for download.

He obtained them after a successful Freedom of Information Act request.

The fee for obtaining his models was $58.

Download links to obtained models:


I hope we can obtain rest of the models NIST relied on for further study.