Posted by Paul Malo on January 10, 2002 at 14:37:47:In Reply to: Re: SurePlate steel building connections WTC?? posted by d on January 10, 2002 at 14:17:46:
I think you misread the statement. The core takes ONLY vertical loads, not ALL the vertical loads. The wording is liable to be misread, as you did. It would have been clearer to say the the core takes part of the vertical load but no horizontal load. The core would take far less than a half of the floor loads, if you sketch the plan, with the load of half the span on all sides carried to the core. But,as we learn that the core carried ONLY THE DEAD LOAD OF THE ELEVATOR SHAFT,there must have been columns ringing the core that actually carried the floor. The core itself (the concrete tube around the elevators) did not support the floors.
What columns act as wind bracing? All of the columns? Were there columns in the exterior wall? I thought not--that all those many mullions were structural, serving as columns.
It seems clear that we really have been flying blind, theorizing without adequate information of what the structure actually was, and how it actually worked.
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