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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Click Here to join Eng-Tips and talk with other members! He uses the Gaylord’s infomation. Based on test results shown in Gaylord the ACI equations are as good as any and it is an actual written specification. While this recommended practice refers to “Building Code Requirements for Reinforced Concrete” ACI for many requirements, it puts forth special requirements and ways of considering the unique cases of static and dynamic loading from funnel flowmass flow, concentric flow and asymmetric flow in silos and the special loading on stacking tubes.
If there are any suggestions or if anyone knowns of a source of good information, please let me know. It’s easy to join and it’s 3139-7.
Concrete construction ; Design standards ; Earthquake resistant design ; Granular materials ; Reinforced concrete ; Reinforcing steel ; Silos ; Stresses ; Structural analysis ; Structural design Uncontrolled Terms: Join your peers on the Internet’s largest technical engineering professional community. This document was replaced by Lateral loads Subject Areas: 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 axi have a density, which tends to make one reluctant to calculate stresses to 8 decimal points.
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.
This should be good enough for me qci least for cement, sand, and gravel where I am now working. While I find the science interesting, where I end up is more important than how I get there.
What I want is ‘good’ final answer. But that’s just a guess. I am doing an investigation now and will begin writing a program to do these calcs when I can determine the best way to proceed. The Eng-Tips staff will check this out and take appropriate action.
Bin design with ACI It looks to me at this point that I will be using a combination of methods depending 313-997 if it’s a shallow bunker or deep bin, filling or emptying, funnel-flow or mass-flow, or a vertical wall or hopper. The wci got built, it didn’t fall down, but does anyone really know how safe it is? For those so inclined the Jenike and Johanson site at www. Very true about the older designs.
Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. I would also be cautious about using a particular approach just because it has given “good” results before.
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It’s one of the books I had forgotten about, or at least couldn’t remember enough to be able to find it again. Oct 1 By joining you are opting in to receive e-mail. A company I worked for years ago doesn’t even have an engineer on staff anymore.
The interesting thing is that I work with a guy who has been designing water-tanks and silos for 30 years. Silos and stacking tubes are special structures, posing special problems not encountered in normal building design.
Bin design with ACI aggman, You mention that you work with someone who has been doing this for years that uses Gaylords information and is unwilling to change. Any help will be appreciated. Are you an Engineering professional?
When I first saw the 77 spec I was not comfortable with increasing the designs by a factor of 2. Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. 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.
International Concrete Abstracts Portal. Defense manufacturing is all about project manufacturing and project accounting. Prior to that the people I knew were using equations published by Ketchum about a hundred years ago based on Janssen’s work. 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.
I think they difference is the horizontal pressure coeficients. It seems to work out fairly close. You could go on for years building structures that were seriously overstressed, until finally one collapses.
I haven’t made it through all of it yet but plan to do so to see if they have changed any of their procedures, or if there is anything else new. Thanks for the input, -Mike. As a consultant I feel I need to 31-397 guidelines established by nationally recognized authorities even thought there are few.
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I can live with that. Silos and stacking tubes are special structures, posing special problems not encountered in normal building design. It includes design and construction recommendations for cast-in-place or precast, conventionally reinforced or post-tensioned silos.
There are many other materials that can cause unusual and serious functional and loading problems, so I agree that caution is certainly warranted when designing a bin. This section specifies the overpressure factor to be a minimum of 1.
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. ACI utilizes at rest pressures larger.
Bin design with ACI 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 and this third method seems to work okay too”.