ozeco41
Philosopher
Just one point - "tilt" is a consequence NOT a cause per se.... We have tilting, that should cause cracking and fulcrum formation on the welds, debris falls on those venerable welds, they fracture and the top fails.
That is just my theory, please rip it apart if I am wrong, please falsify it if it is fallacy.
Take care to avoid the error of sequence.
1) Some columns failed - either cut by initial impact OR failing in axial compression overload assisted by heating.
2) Those failures of columns led to - were followed by - visible evidence of already failed columns in the form of "tilt" (It would have been "lowering" if it hadn't been asymmetrical biased to one side to cause "tilt".) So "tilt" is a consequence of failed columns - not a cause.
3) Because the columns have already crushed to allow the drop which caused the tilt the ends of the crushed and bucking columns MUST have already missed. Because on the "low side" the space no longer exists for the original length of column. And it is many feet less space - so whether buckled, bent or folded the ends have already missed.
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