Dynamic Loaded Machine Foundation 5

[rlewistx]

I am designing a foundation for a 130,000 lb compressor with dynamic loads. The foot print of the equipment is over a 30X40 ft. area. It will have a separate mat foundation below it.

I have done some research and it appears to me a dynamic load such as this requires a special analysis to calculate the deflections based on the dynamics. I found several references on this, one in particular by Bowles in the 5th ed., chapter 20. He has a program to calculate the vertical, horizontal and rocking deflections due to the machine dynamics. Is the method he describes in his book what is commonly used in practice today? Is there an easier way to do this?

Bowles method requires the dynamic shear modulus. Are there some tables with typical values for clay soil other than what he has in his text? Bowles uses primarily metric in this chapter and doesn't have an equation for English dynamic modulus.

I would appreciate any suggestion I can get for foundation design of dynamic equipment loads.

 

[BigH]

There is a book by Arya (or something like that) - it is quite good and gives a complete analysis of the various spring constants, amplitudes, etc. I had put it all on a spreadsheet a long time ago and have a copy of it . . .

 

[trilinga]

Design of foundations for dynamic machines is dealt very well in the book by Alexander Major and another by Barkan.These two books are very good guides for machine foundation design.

 

[SlideRuleEra]

I know of three papers on the subject:

"Don't Gamble on Machinery Foundations" by William Kauffmann, 2 pages - 1973

"Principles of Foundation Design for Engines & Compressors" by W.K. Newcomb (Ingersoll-Rand), 7 pages - 1951

"Basic Vibration & Vibration Isolation Theory" by Unisor Machinery Installation Systems, 11 pages - mid 1980s

I hope you find them useful.

 

[chichuck]

BigH,

That book is "Design of Structures and Foundations for Vibrating Machines," by Suresh Arya, Michael O'neill and George Pincus. Published by Gulf Publishing Company, 1979, 1981. ISBN no. 0-87201-294-8. Library of Congress Catalog Card No. 78-56171.

Regards

 

[jheidt2543]

One of the classics on machine foundation design is "Vibrations of Soils and Foundations" by Richart, Hall and Woods, Prencice-Hall, Inc., 1970 ISBN 13-941716-8

 

[SlideRuleEra]

These papers

"Don't Gamble on Machinery Foundations"

"Principles of Foundation Design for Engines & Compressors"

"Basic Vibration & Vibration Isolation Theory"

are now posted in .pdf format at

http://www.angelfire.com/mech/slideruleera

 

[jheidt2543]

SlideRuleEra, thanks for a great post! You get a star from me today.

 

[getmtigers]

Excellent resource!! GJ Slide!!

 

[1969grad]

Old rule of thumb says that the weight of the foundation should be 3 times the weight of the machinery for a balanced machine and 5X for an unbalanced machine.

I am mechanical engineer so I profess no experise in foundation design but know that I would make sure the above was met as a minimum. As cheap as concrete is compared to the other project costs I would not take any chances by installing any smaller foundation.