NIST was tasked with investigating what caused the 3 buildings to collapse. For WTC 1 and 2 they stopped short, basically saying it just fell down. For building 7 it seems NIST sold us a wooden nickel. Hulsey and 2 PhD students each using different modeling software accounted for every connection throughout the whole building. NIST set the outside columns as immovable, left out the welded web stiffeners and the welded plates to the H column completely, both of which completely lock the beam into place preventing it from slipping anywhere much less too far. Even if they web stiffeners were missing completely the beam would still have been locked and not able to slip off NIST further did not put in their model the 'buckle prevention' stiffeners around the welded to the perimeter. The only way to match what we actually saw that day was to remove, get this, support for 8 floors! Any other scenario the building tipped over or wrinkled or produced some result other than what we saw that day!