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- From: Lew Midlam <Lew.Midlam(--nospam--at)lcm.com>
- Date: Sat, 31 Jan 1998 20:31:16 -0500
ACI has a paperback book (I can't find my copy, but I think it's titled "Design of Foundations for Machinery" - ornage, white & blue cover) which is a collection of papers on this subject. I would be very cautious of any rule-of-thumb. These are often provided by the equipment manufacturer, and will get you in the ball park, but you really should do a dynamic analysis if you're concerned about vibration of nearby equipment or buildings. You'll need a soils report (be sure to tell the geotechnical engineer what parameters you need - see the ACI book) and the equipment's dynamic data - such as max. angular momentum, & acceleration vs. frequency, etc. Also, don't forget to do a seismic overturning analysis if Greensboro is in a seismic zone other than 0. Lew Midlam, PE www.lcm.com ========================= Theodore H. Partrick, Jr. wrote: > I think I remember seeing on this list a long time ago some discussion of > isolated slabs used for equipment support. These slabs are usually on the > order of 24" thick for generator pads under 10,000 lb generators, something > on the order of four times the equipmtent weight. > > For a 20,000 pound diesel generator, 1800 rpm at rated load, would a > reasonable approach for isolation and support be a slab of 80,000 pounds > (24" x 12' x 24')? Vibration isolation is not so much for human comfort, > just don't want to shake the building (1 story masonry, reinforced) and > contents apart. > > Is a rule of thumb applicable for such equipment support? I have struck out > in my own library. > > Any support would appreciated. > > Ted Partrick, PE > City of Greensboro (Greensboro, NC) >
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- From: Theodore H. Partrick, Jr.
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