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Soil Pressures and Value of "e"

Soil Pressures and Value of "e"

Soil Pressures and Value of "e"

(OP)
I'm working on writing my own program (taking the parts of programs I like from people in my firm and adding my own flare) for shear wall foundation design.  The question that I am having a hard time answering is this:

Calculating qmax and qmin is easy for eccentrically loaded foundations.  What I'm struggling with is when e>L/6, how do you determine where there is "0" soil pressure on the footing?  I need to figure out the location so I can finish my free body diagram!

Thank you,

D

RE: Soil Pressures and Value of "e"

When e = L/6, the stress varies from 0 to 2*Average pressure or 2*P/AL.

When e > L/6, the effective length of the footing is reduced to, say B.  The c.g. of loads will be located at B/3 from the stressed edge.  Now, the stress will vary from 0 to 2*P/AB.  The distance x = L - B.

BA

RE: Soil Pressures and Value of "e"

(OP)
Thank you BA

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