Equivalent Fluid Pressure
Equivalent Fluid Pressure
(OP)
I work for a company that does a lot of storage buildings. Many times these builidngs have concrete walls that retain fertilizer (all types), grain and salt/sand storage. What resource can I turn to to get the most accurate values for evaluating the pressure imposed by the material on the walls? I've used the old Midwest Plan Service book for grain but what about the other materials? Because I work for the company that supplies the building as well as the foundation I'm looking at applying the most accurate numbers without being too conservative with the design.
Thanks
Thanks






RE: Equivalent Fluid Pressure
RE: Equivalent Fluid Pressure
Thanks for the suggestion. I used to have that book but lost in when I changed jobs a few years back. I guess I can pick up a used copy of it.
RE: Equivalent Fluid Pressure
With that said, this book is likely a close second if you don't have Gaylord & Gaylord.
RE: Equivalent Fluid Pressure
This isn't my area, but I know that storage structures can be subject to much higher lateral pressures than expected because of thermal ratchetting.
Link with a brief description:
http
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Equivalent Fluid Pressure
Gaylord and Gaylord also wrote a book specifically on bins and silos, and if you're shopping for used books, look for it. I think John Buzek has a silo book available through the Steel Plate Fabriators Association.
RE: Equivalent Fluid Pressure
This has been helpful but I should clarify that this is not a steel bin. This is a steel truss building with a fabric membrane roof. Additionally it has reinforced concrete walls of up to 10' in height retaining the products mentioned in the first post. Very often the endwalls of these buildings are open so thermal changes aren't so much a concern as what humidity does to the product. With all that said, I would be happy to pick up any of the books that have been referenced but they are all fairly expensive so it would be nice to know if the information I seek is actually in the books you mention. Specifically, what is the Equivalent fluid pressure exerted on a vertical surface from urea, dap, potash, salt/sand mixtures, grain, etc. If you have seen it in a book that is all I need to know to buy the book.
Thanks again,
RE: Equivalent Fluid Pressure
This is not the time to sharpen your pencil. Some reasonable amount of conservatism needs to be built into the design as the loaders will beat the walls to death.
Maybe there is something published by the agricultural industry that may help. You may be able to find material densities and angles of repose.
http://www.mpd-inc.com/material.htm
RE: Equivalent Fluid Pressure
Duly noted about the loader loads. I did open the attachment and it had great densities of product but no repose angles or EFD values. The search continues.
Thanks again
RE: Equivalent Fluid Pressure
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Here is one for salt (32 degrees) and for sand (also 32 degrees).
http://www.dome-corp-na.com/sand.html
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RE: Equivalent Fluid Pressure
Those pages were great. The only thing missing was the calculation for pressure against the retaining walls. Is there a quick formula that I'm not aware of that if you have the material weight and angle of repose that you can determine the pile pressures against vertical retaining surfaces?
RE: Equivalent Fluid Pressure
http://www.slideruleera.net/Steel-Piling.html
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RE: Equivalent Fluid Pressure
If this is material you're buying, you might check with suppliers for information.
RE: Equivalent Fluid Pressure
Thanks for the pdf that is exactly what I needed. Thanks to everyone else for your valued insights.
dmoench
RE: Equivalent Fluid Pressure
Google books has a preview. It appears to offer what you're looking for.