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RE: Protection of Drain Pipe Under Mat Foundation

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D E –


It’s not a uniform pressure; it’s a trapezoidal pressure.


I’ve been doing this a long time. Don’t worry; the numbers are right.




T. William (Bill) Allen, S.E.


Consulting Structural Engineers
V (949) 248-8588 F(949) 209-2509

-----Original Message-----
From: D E [mailto:struktur.dle(--nospam--at)]
Sent: Thursday, May 29, 2008 1:37 PM
Subject: Re: Protection of Drain Pipe Under Mat Foundation


Sounds like your soils allowables are close to, if not over, the limit. I just wanted to point out that a 29'x22.5' map with a 700psf soil pressure gives a weight of cmu of 29'x22.5'x700psf=456,000 lbs of masonry. That is a lot of masonry. The 1300psf under lateral seems really high too. Things to check: What is your weight of masonry? What is the vertical center of gravity of cmu? what is your allowable base shear coefficient?