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mat footings under 15-storey building design

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Following up my previous comment:

1. Mixing pile and soil support is tricky because:
	A. The solution will be highly dependent upon not-very-well-know
soil and pile stiffness parameters.
	B. In reality the soil and pile deflections will not be totally
independent of each other (best to consult geotech)

2. To resolve "A" above, a range of parameters could be used to envelope
the real solution.

3. If the soil under the elevator core is overstressed it will NOT fail
in a brittle fashion. Perhaps the geotech could give you a reduced soil
stiffness for the heavily loaded soil under the elevator core. This will
result in higher deflections under the elevator core (may be a problem
in your case), but will reduce the bearing stresses in that area (and
increase the bearing stresses elsewhere, as well as increasing the
forces in the mat).

4. To distribute the load better post-tensioning could be added to the
slab at the problem location and profiled to move the load away from the
elevator core.

5. Our program FLOOR ( will handle this. A free limited
version is available for download. But then, we are very biased.


Jim Trenerry
Structural Concrete Software
425 482 0978
425 984 0205 (fax)

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