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Re: Pole Foundation Embedment[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Pole Foundation Embedment
- From: Ed.Haninger(--nospam--at)fluor.com
- Date: Tue, 9 Nov 1999 13:07:27 -0800
Raj, Some responses to your questions: 1) S1 is a function of embedment depth and makes it an interative solution. 2) Frost depth would not normally be deducted from the effective embedment depth. The design should be based on non-frozen soil. Frozen ground would normally be stiffer and not governing. Two cautions, however: a) frozen soil can cause uplift in the pile such that the embedment below the frost should resist this and b) it is common to ignore the top 1 ft of soil to account for a possible loss of soil over the life of the structure. 3) I would use the lateral bearing value at 1/3 the depth for S1 calculation, but also check that the value of lateral bearing does not exceed the 15x value in the table or the 12 ft maximum depth for lateral bearing calculation per the definition of "d". If this occurs, the S1 would need to be reduced to account for the new soil pressure diagram. And, most important, if this is a critical design or you have special circumstances, you should consult a geotechnical engineer. Ed Haninger, SE - but not a geotech engineer Fluor Daniel Aliso Viejo, CA RajSTC(--nospam--at)aol.com on 11/09/99 11:18:24 AM Please respond to seaint(--nospam--at)seaint.org To: seaint(--nospam--at)seaint.org cc: (bcc: Ed Haninger/AV/FD/FluorCorp) Subject: Pole Foundation Embedment I have difficulty in interpreting pole foundation embedment formula given in UBC. Required depth, d, of embedment is a function of S1, which is defined as "Allowable lateral soil bearing pressure as set forth in Table 29-B, based on a depth of one-third the depth of embedment." Is it, therefore, correct to say that, S1=Allowable Lateral Bearing X (Depth of embedment)/3? Also, would it not be prudent to discount the frost depth in this calculation? One of the footnotes to table 29-B, states that the lateral bearing value "may be increased the amount of the designated value for each additional depth to a maximum of 15 times the designated value." So, if d=10 feet in clayey soil, is the lateral bearing equal to 1000 psf/ft depth of embedment or should it be an average value of (100+1000)/2 = 550 psf/ft depth of embedment? Taking advantage of this footnote will make the solution iterative, because while 'd' is dependent on S1, S1 itself becomes a function of 'd'. Any comments? Thanks. Raj.
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