While there has been significant discussion of the detailed FEA performed by ARUP of WTC 7 it seems many on this forum have either failed to notice, or are loathe to comment on, the fact that the analysis shows that column 79 would have retained lateral support from its girders from the south and west.
This would have prevented column 79 from buckling, as all it needed was orthogonal support from two separate girders.
It does not matter whether the girder to the north, (A2001) between columns 79 and 44, was pulled from its seat, as it was not necessary as long as there was a girder supporting column 79 from either the north or south and one from east or west.
Contrary to what is simply asserted in the NIST WTC 7 report the knife connections of the south and west girders to column 79 remain intact in the results of all four cases shown in the ARUP report.
To see the results attesting to this in the ARUP report one can look at figures 101, 111, 121, and 131 on the left sides of pdf pages 138, 148, 155, and 163 at http://ift.tt/1S2AFRN.
The reality is that if column 79 does not lose lateral support, and does not buckle, there could have been no global collapse progression due to it and the fires around it and the collapse had to have another cause. This requires a new investigation as it shows the NIST claim that column 79 buckled to initiate the global collapse is not possible.
This would have prevented column 79 from buckling, as all it needed was orthogonal support from two separate girders.
It does not matter whether the girder to the north, (A2001) between columns 79 and 44, was pulled from its seat, as it was not necessary as long as there was a girder supporting column 79 from either the north or south and one from east or west.
Contrary to what is simply asserted in the NIST WTC 7 report the knife connections of the south and west girders to column 79 remain intact in the results of all four cases shown in the ARUP report.
To see the results attesting to this in the ARUP report one can look at figures 101, 111, 121, and 131 on the left sides of pdf pages 138, 148, 155, and 163 at http://ift.tt/1S2AFRN.
The reality is that if column 79 does not lose lateral support, and does not buckle, there could have been no global collapse progression due to it and the fires around it and the collapse had to have another cause. This requires a new investigation as it shows the NIST claim that column 79 buckled to initiate the global collapse is not possible.
via International Skeptics Forum http://ift.tt/1PlTGxD
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