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Re: Foundation Vibration Design[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "INTERNET:seaoc(--nospam--at)seaoc.org" <seaoc(--nospam--at)seaoc.org>
- Subject: Re: Foundation Vibration Design
- From: "Kathleen A. O'Brien" <wildwoman1(--nospam--at)compuserve.com>
- Date: Fri, 30 Jan 1998 22:42:49 -0500
>> 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<< Wouldn't it be better to keep the foundation block soil system frequency GREATER than the equipment frequency at all times? I look at it this way: When the equipment is not running, it's frequency is zero. Turn it on, and the frequency will vary from 0 to its maximum natural frequency. If the Foundatiuon system frequnecy is less than the Equipment frequency, at some point the two will be equal. Then I would think we would have some amplification (a la the Tacoma Narrows bridge). Kate O'Brien Simi Valley
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