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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International Concrete Abstracts Portal
I am specifically concerned with calculating loads on bins and the use of the overpressure factor in section 4. Bin design with ACI Very true about the older designs. Download Now Defense manufacturing is all about project manufacturing and project accounting. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting acu forbidden. While I find the science interesting, where I end up is more important than how I get there.
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 indicate that pressures during emptying are greater. My designs 313-977 always either comparable or slightly conservative to him. Prior to that the people I knew were using equations published by Ketchum about a hundred years ago based on Janssen’s work.
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By joining you are opting in to receive e-mail. 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 I’m with you on this in terms of the K factor and overpressure of 1. International Concrete Abstracts Portal. Buzek as the author.
But that’s just a guess. Afi Now White Paper: 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.
Xci possible that many of acj ‘old’ designs exist with a reduced factor of safety.
An older version of the spec ACI had factors up to 2. 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 313-79 and dynamic loading from funnel flow, concentric flow, and asymmetric flow in silos, and special loadings on stacking tubes.
Close this window and log in. It’s one of the books I had forgotten about, or at least couldn’t remember enough to be able to find 31-397 again.
Bin design with ACI – Structural engineering other technical topics – Eng-Tips
It’s easy to join and it’s free. When I first saw the 77 spec I was not comfortable with increasing the designs by a factor of 2. 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.
ACI Committee Publication: Unwillingness to change what has worked forever. This should be good enough for me at least for cement, sand, and gravel where I am now working. Any help will be appreciated. The interesting thing is that I work with a guy who 331-97 been designing water-tanks and silos for 30 years. I can live with that. This section specifies the overpressure factor to be a minimum of 1.
What I want is ‘good’ final answer. While this recommended ai 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.
Oct 1 For those so inclined the Jenike xci Johanson site at www. This document was replaced by The point to be learned is that there is not just a wide variation in the methods used, but in the loads themselves. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. The Eng-Tips staff will acj this out and take appropriate action. Geotechnology; Highways; Materials; I 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.
The standard includes requirements for 313-79 design and hopper bottom design. Register now while it’s still free! ACI utilizes at rest pressures larger. I like the ACI method because it is a 313-977 spec instead of a bunch of research papers.
It seems to work out fairly close. It includes design and construction recommendations for cast-in-place or precast, conventionally reinforced or post-tensioned silos.