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Re: increase in foundation bearing pressure.

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I always thought that this one-third increase is an old-code equivalent
of 0.75 (1.4D+1.7L+1.7W) thing and has nothing to do with the soil. The
geotechnical engineer writes  "net allowable bearing pressure" and as
long as he is not giving an ultimate value (perhaps with a reduction
factor like phi=0.85), I shall keep using the 1/3rd provisions.