Buckling of WTC7 Column 79 (IMAGE)

National Institute of Standards and Technology (NIST)

Buckling of WTC7 Column 79

Caption

NIST graphic showing the buckling of WTC 7 Column 79 (circled area), the local failure identified as the initiating event in the building's progressive collapse on 9/11.

Credit

NIST Building and Fire Research Laboratory

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