The Construction of the WTC Towers 1 & 2

The Construction of the WTC Towers 1 & 2 Exterior Framing The first major structural subsystem was the exterior framing, which was a vertical square tube that consisted of 236 narrow columns, 59 on each face from the 10th floor to the 107th floor (Figure 3). There were fewer, wider-spaced columns below the 7th floor … Continue reading The Construction of the WTC Towers 1 & 2