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RE: Concrete Poles[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Concrete Poles
- From: "Cain, William" <bcain(--nospam--at)ebmud.com>
- Date: Tue, 16 Feb 1999 13:10:01 -0800
My favorite method for drilled piers is one by Czerniak, published in the Journal of the Structural Division of ASCE in March 1957. It is proceedings paper 1188. The method is limited to caissons for which the Depth(D) to Diameter(b) ratio is such that deflection within the footing is not significant (i.e., you assume that the footing is rigid). Czerniak suggests a maximum D/b ratio of about 10 but given the lack of precision on the loads and soil resistance in these types of problems, that D/b ratio is probably a bit conservative. The method is general in that it can handle various relationships of the overturning moment and the shear force which allows modeling things such as rigid pier caps, the caisson being the bottom of a frame or the top pinned with little additional effort. Like the Timoshenko beam on an elastic foundation method Charles Greenlaw referred to for the railing problem currently being discussed on the listserver, this paper comes complete with tables, charts and formulas so you can see if it really meets your needs at no additional charge. :<) Bill Cain, SE Oakland, CA -----Original Message----- From: Jim Kestner [SMTP:jkestner(--nospam--at)somervilleinc.com] Sent: Monday, February 15, 1999 13:34 PM To: seaint(--nospam--at)seaint.org Subject: Re: Concrete Poles Mike: A round concrete pier embedded in the ground is the typical method used to support these types of structures. The depth of embedment is determined by the Rutledge Method. The overturning is resisted by the development of opposite passive pressures at different depths similiar to a cantilevered sheet pile wall. The biggest unknown will be your soil conditions. Perhaps you might want to give your client different embedment depths for different soil conditions. Jim Kestner, P.E. Green Bay, Wi.
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