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Re: Foundation Vibration Design[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: Foundation Vibration Design
- From: "Michael Valley" <mtv(--nospam--at)skilling.com>
- Date: Tue, 27 Jan 1998 15:13:06 -0800
- Comments: Authenticated sender is <mtv(--nospam--at)linux.skilling.com>
- Priority: normal
Ted, The dynamic response of a foundation to vibrating loads is really a function of the frequency of the foundation soil system (rather than simply the weight of the foundation). The NAVFAC Design Manual DM7 has a nice (practical) discussion of the important parameters as well as recommendations for frequency separation, etc. You can change the frequency by altering the mass and stiffness of the foundation soil system. Increasing the foundation weight decreases the natural frequency. Increasing the foundation contact area (or improving the soil by grouting) increases the natural frequency. NAVFAC DM7 recommends that the "natural frequency of the foundation block soil system should be less than one-half or greater than two times the equipment operating frequency." In most cases this is possible. However, I have seen some cases where the practical range of foundation parameters do not quite allow this magnitude of frequency separation. "Foundation Vibration Analysis Using Simple Physical Models" by John Wolf (PTR Prentice Hall) provides some guidance for a potentially more involved approach. -Mike Valley > I think I remember seeing on this list a long time ago some discussion of > isolated slabs used for equipment support. ... > ...on the order of four times the equipmtent weight. > > Is a rule of thumb applicable for such equipment support? I have struck out > in my own library. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Michael Valley E-mail: mtv(--nospam--at)skilling.com Skilling Ward Magnusson Barkshire Inc. Tel:(206)292-1200 1301 Fifth Ave, #3200, Seattle WA 98101-2699 Fax: -1201
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- From: Theodore H. Partrick, Jr.
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