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Shear Walls extending to Basement Level

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Picture a shear wall extending to the basement level. It would seem that if
the 1st floor diaphragm was tied into the shear wall with rebar (and that
the diaphragm could transfer load to the perimeter foundation walls) that
the shear wall would try to act as a cantlivered beam using the foundation
in the basement and the 1st floor diaphragm as its supports. It would seem
to me that this would potentially create a large cranking force on the 1st
floor diaphragm that would be difficult to design for since the shear would
be magnified.

All my references show examples of shear walls going to grade level and not
to the basement level.

How is this condition normally handled? Is it practical to isolate the shear
wall from the diaphragm at the 1st floor level so that all overturning and
shear forces are transfered to the foundation at the basement level? It
doesn't seem practical to stop the shear wall at the 1st floor level. The
1st floor shear wall would have to be designed as a transfer beam and
columns on either end would have to extend into the basement to transfer the
up and down forces.

How are these designed on high rises where there may be multiple basement
levels to contend with?

Jim K.






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