WTC Construction
The photos below were taken during WTC construction and show the heavy steel beams used. Photos from Dr. Steven Jone's paper Why Indeed Did the WTC Buildings Completely Collapse?.

The photo below shows the layout of the central 47 massive steel colums relative to the floor area and the outer skin which was made of lighter steel columns.

The photo below shows the layout of the central 47 massive steel colums relative to the floor area and the outer skin which was made of lighter steel columns.

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