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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I am specifically concerned with calculating loads on bins and the use of the overpressure factor in section 4. My designs are always either comparable or slightly conservative to him. You could go on for years building structures that were seriously overstressed, until finally one collapses. Silos and stacking tubes are special structures, posing special problems not encountered in normal building design.
The point to be learned is that there is not just a wide variation in the methods used, but in the loads themselves. Are you an Engineering professional? Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. 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.
Resources Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. Silos and stacking tubes are special structures, posing special problems not encountered in normal building design. It’s one of the books I had forgotten 3113-97, or at least couldn’t remember enough to be able to find it again.
Bin design with ACI – Structural engineering other technical topics – Eng-Tips
Bin design with ACI aggman, You mention that you work with someone who has been doing cai for years that uses Gaylords information and is unwilling to change. 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”.
It’s easy to join and it’s free. Based on test results shown in Gaylord the ACI equations are as good as any and it is an actual written specification.
While this standard refers to Building Code Requirements for Structural Concrete ACI for many requirements, it puts forth special requirements for 313-997 unique cases of static and dynamic loading from funnel flow, concentric flow, and asymmetric flow in silos, and special loadings on stacking tubes.
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It’s possible that many of the ‘old’ designs exist with a reduced factor of safety. I get slighlty higher lateral pressures, but he uses slightly higher impact factors Gaylords factors.
For hoppers both the Jenike and Walker equations are probably satisfactory. 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. Any help will be appreciated. What I want is ‘good’ final answer.
3113-97 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. The standard includes requirements for seismic design and hopper bottom design.
He uses the Gaylord’s infomation.
When I first saw the 77 spec I was not comfortable with increasing the designs by a factor of 2. Geotechnology; Highways; Materials; I The Eng-Tips staff will check this out and take appropriate action.
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.
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Very true about the older designs. Thanks for your comments. 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. When I get into other types of bins I like to have testing done to verify the lateral pressures.
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. It seems to work out fairly close. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
Concrete construction ; Design standards ; Earthquake resistant design ; Granular materials ; Reinforced concrete ; Reinforcing steel ; Silos ; Stresses ; Structural analysis ; Structural design Uncontrolled Terms: 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.