CONSTRUCTION OF CONCRETE SILOS AND STACKING TUBES FOR STORING GRANULAR MATERIALS (ACI ) AND COMMENTARY–ACI R-. ACI January Standard Practice for Design and Construction of Concrete Silos and Stacking Tubes for Storing Granular Materials. Does anyone have experience with ACI and designing steel bins? I am specifically concerned with calculating loads on bins and the.
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The interesting thing is that I work with a guy who has been designing water-tanks and silos for 30 years. Oct 1 Students Click Here Join Us! Prior to that the people I knew were using equations published by Ketchum about a hundred years ago based on Janssen’s work.
It seems to me that many bins have been sucessfully designed in the past just using filling pressures per the Janssen equation, but on the other hand, published literature does clearly 133-97 that pressures during emptying are greater. Promoting, selling, recruiting, coursework and thesis posting is forbidden. I think they difference is the horizontal pressure coeficients.
An older version of the spec ACI had factors up to 2. ACI Committee Publication: Does anyone have experience with ACI and designing steel bins? For those so inclined the Jenike and Johanson site at www. I can live with that. His arguement is that he is confortable with his designs based on his experience and therefore sees no reason to utilize a seemingly more conservative approach. If there are any suggestions or if anyone knowns of a source of good information, please let me know.
I get the impression when reading the Gaylord text that the value of K is sometimes used as a fudge factor to skew results towards where the researchers want to end up anyways.
While this standard refers to Building Code Requirements for Structural Concrete ACI for many requirements, it puts forth special requirements for the unique cases of static and dynamic loading from funnel flow, concentric flow, and asymmetric flow in silos, and special loadings on stacking tubes. Appendices provide values for over pressure and impact factors form stored materials.
Silos and stacking tubes are special structures, posing special problems not encountered in normal building design. This should be good enough for me at least for cement, sand, and gravel where I am now working. A newer version of this document exists.
Buzek as the author. I am specifically concerned with calculating loads on bins 3113-97 the use of the overpressure factor in section 4. I’ve come to the conclusion that many of the homemade bins and the bins produced by small inexperienced fab shops have less than the desired factor of safety.
This section specifies the overpressure factor to be a minimum of 1. I like the ACI method because it is a published spec instead of a bunch of research papers. Resources Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. International Concrete Abstracts Portal. This document was replaced by This ACI standard practice gives material, design, and construction requirements for concrete silos, stave silos, and stacking tubes for storing granular materials, It includes design and construction recommendations for cast-in-place or precast and conventionally reinforced or post-tensioned silos.
Very true about the older designs. He uses the Gaylord’s infomation. Bin design with ACI aggman, Acl mention that you work with someone who has been doing this for years that uses Gaylords information and is unwilling to change. Click Here to join Eng-Tips and talk with other members! It’s easy to join and it’s free. ACI utilizes at rest pressures larger. More often than not, when I’ve designed hoppers or silos, I’ve had very limited information on the flow properties of the product, and was doing good to have a density, which tends to make one reluctant to calculate stresses to 8 decimal points.
What I recall from using the Gaylord book is that they give several different equations and factors, and then say “You can use this one, but some people use this one 3113-97 this third method seems to work okay too”.
Bin design with ACI – Structural engineering other technical topics – Eng-Tips
Join your peers on the Internet’s largest technical engineering professional community. To me Gaylord and Gaylord is the latest information because that was when I first became aware of the overpressure coefficients, although they do present several different ways to do the calcs. I haven’t made it through all of it yet but plan to ac so to see if they have changed any of their procedures, or if there is anything else new. Appendices; Figures; References; Tables; Pagination: Bin design with ACI It looks to me at this point that I will be using a combination of methods depending on if it’s a shallow bunker or deep bin, filling or emptying, funnel-flow or mass-flow, or a vertical wall or hopper.
Geotechnology; Highways; Materials; I Download Now White Paper: I have used ACI quite a bit.
International Concrete Abstracts Portal
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The point to be learned is that there is not just a wide variation in the methods used, but in the loads themselves. I pretty much use the at rest pressure with the 1.
It’s possible that many of the ‘old’ designs exist with 313-79 reduced factor of safety. It looks to me at this point that I will be using a combination of methods depending on if it’s a shallow bunker or deep bin, filling or emptying, funnel-flow or mass-flow, or a vertical wall or hopper.
Silos and stacking tubes are special structures, posing special problems not encountered in normal building design. I think I saw this years ago and it was a good reference. Register now while it’s still free! It seems to work out fairly close. Close this window and log in. What I want is ‘good’ final answer.