Framed Tube Structure

Original WTC towers were framed tube structures

  • Remember the name, Fazlur Khan
  • Simplest incarnation of structural tube

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This is the simplest incarnation of the tube. It can take a variety of floor plan shapes from square and rectangular, circular, and freeform. This design was first used in Chicago's DeWitt-Chestnut apartment building, designed by Khan and completed in 1965, but the most notable examples are the Aon Center and the original World Trade Center towers.