Posted by Paul Malo on January 10, 2002 at 09:27:21:In Reply to: Re: SurePlate steel building connections WTC?? posted by d on January 10, 2002 at 09:05:11:
Any resistance to deflection at the end of the cantilever would mean it was no longer a cantilever. A cantilever has no internal stress at its outer end, but the minute that end is propped up, the end develops shear and bending stresses. It can't be a cantilever and not a cantilever at the same time. If you prop up the end to avert deflection, you're transmitting some of the load to the prop.
I can't speak to the secondary opinions of others about how the structure was designed and worked. I find it hard to imagine these trusses being cantilevered from the core, with no end support. If so, what would provide bracing for the exterior wall against lateral wind loads? Surely the wall was not sufficiently thick to serve as a beam spanning from corner to corner, was it?
I'm suspicious about that quotation. It may have been a journalist's impression, or simplification for the general reader. I was always of the impression that the exterior was a bearing wall. If so, it would require lateral support not to buckle under the great compressive load, and the floor system might have served to provide horizontal bracing.
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