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Viewing Single Post From: Debunking NIST's August 21, 2008 Final Report on W
Grit1645

It's entirely possible that no shear studs were used on the girders. They were probably able to determine whether there were any or not from the original construction photos and/or the debris remains of the girders themselves.
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Debunking NIST's August 21, 2008 Final Report on W · WTC 7