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re: low-cost earth foundations
14 jul 1997
ernsdesk wrote:
>the lift on a body is l = cl 1/2 rho v^2 a
looks reasonable.
>...9200 pounds...to hold down a massless house...
people seem to worry more about houses overturning than lifting or sliding, ie
resisting a moment vs a force. the moment might be the wind force on the
largest wall/roof of the house, times half the height, eg 9200lbx8'= 74k lb.
the resisting moment might be the downward pull of the foundation (the weight
of the concrete + soil above it, screw anchors, water containers over deadmen,
etc.) times the width of the house, eg 2400lbx32', ie 2400lb/64'= 36 pounds
per linear foot along the 64' side of a 32x64' massless house.
nick
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