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- To: seaoc(--nospam--at)seaoc.org
- Subject: caisson footings
- From: Mark and Jessica Pemberton <jmpember(--nospam--at)softcom.net>
- Date: Sat, 21 Feb 1998 14:38:43 -0800
Date: Thu, 19 Feb 1998 20:06:30 To: seaoc(--nospam--at)seaoc.org From: Mark and Jessica Pemberton <jmpember(--nospam--at)softcom.net> Subject: caisson footings I have one remaining general questios regarding 94 UBC caisson footing equations: (Thanx to Lawrence B. Karp for answering the first question I had) The code allows for a developed frictional force between the walls of a cast in place caisson footing and the soil equal to 1/6 the allowable bearing stress (per table). By using this value I find that the frictional resistance is several times that derived using standard skin friction equations. Why is this? The maximum the code allows is 250 psf of frictional resistance which is way more than you can achieve in any standard soil. Is this value perhaps only allowed for resistance in the downward direction, or can it be used to resist uplift as well? Any help would be greatly appreciated. So far I am getting widely varied opinion on this, and it seems different building departments are interpreting these provisions differently. I have even called ICBO directly and received an unsure at best response.
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