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The WTC North tower was hit between the 93rd and 99th floors. The stud and seat details for the "x01" core column vertical set are on structural drawing 6-AB8-38 below....
The stud and seat details for the "500" core column horizontal set are on structural drawing 6-AB8-35 below
The seat and stud detail for the horizontal "100x" row are on drawing 6-AB8-24
The seat and stud detail for the East "x08" +(807) is on drawing 6-AB8-42
The North row of the core column structure was entirely of stud detail 7A, the South row consisted of 4 x 7A and 2x 8D, and the East and West horizontal core column groups consisted entirely of 7C stud detail. These are shown below.
The above, combined with the bracing detail illustrates just how robust the tower was. In essence, it would have encapsulated the damaged area in a tight composite grip. The corners did not suffer impact damage and would have continued to support the North face floor system from these transverse corners.
Can anyone find where NIST considered this in their analysis ?
The stud and seat details for the "500" core column horizontal set are on structural drawing 6-AB8-35 below
The seat and stud detail for the horizontal "100x" row are on drawing 6-AB8-24
The seat and stud detail for the East "x08" +(807) is on drawing 6-AB8-42
The North row of the core column structure was entirely of stud detail 7A, the South row consisted of 4 x 7A and 2x 8D, and the East and West horizontal core column groups consisted entirely of 7C stud detail. These are shown below.
The above, combined with the bracing detail illustrates just how robust the tower was. In essence, it would have encapsulated the damaged area in a tight composite grip. The corners did not suffer impact damage and would have continued to support the North face floor system from these transverse corners.
Can anyone find where NIST considered this in their analysis ?