Rectangular Bin Loading

[dik]

Can anyone suggest a paper or text on the design loading of rectangular bins. Coarse granular material is 'dumped' from a conveyor into a steel bin.

Design loading would include the impacting of the material on the side as well as a lateral pressure from the material itself or a combination if the dumped material is landing on material in the bin.

Dik

 

[BENDOG]

Chapter 7 of Tubular Steel Structures by Troitsky covers bins and bunkers. It's published by the Lincoln Arc Welding Foundation.

 

[JStephen]

The Structural Engineering Handbook has a section on bins and silos. There's an old Gaylord and Gaylord book on the topic. I think Steep Plate Fabricators has a book by John Buzek on the topic. I'm not aware that any of them consider the impact of material falling onto the hopper shell.

 

[bridgebuster]

Design of Welded Structures by Blodgett also has a part on bins

 

[aggman]

Reference ACI 313-97. Its not directly proportional to steel design but it can be used and it goes over the loadings pretty well. Like others have said though, Gaylords "Design of Steel Bins for the Storage of Bulk Solids" is the bible in the industry. It's out of print so you will probably have to go to your local library to get your hands on it.

 

[dik]

Thanks, gentlemen... I've got all of these except Gaylord's and Steep Plate Fabricators; I'll try to dig those ones up... I'm having difficulty 'wrappin my ears around the design loads... seems that every reference gives me different values.

Dik

 

[paddingtongreen]

You don't say if they are deep or shallow. Do they have discharge hoppers? If so, are they mass flow or funnel flow? (Questions to lead you in the right direction).

Do a web search of "Mass flow, funnel flow"

See some of the work published by these guys:

http://www.jenike.com/

Michael.
Timing has a lot to do with the outcome of a rain dance.

 

[dik]

paddingtongreen:

The rectangular bins/hoppers have a height of approx 20' and a plan dimension of approx 15'. Although they are large, I would consider them as shallow bins. The flow at the top of the bin would be mass flow and as the hopper constricts, some funnel flow would be expected although in general the flow through the region would be mass flow. I'm looking for information/papers on the lateral loading caused by the dynamic forces from the impingement of the particles on the side of the bins/hoppers. I'll try to post a part of the cad drawing.

Dik

 

[IJR]

Dik

Here are some basics for purpose of judgement,and I am reading from some distant memory with apologies. You probably are familiar but allow me to punch a bit.

In a bin, you have downward pressure, lateral pressure and with this lateral pressure you have friction. some weight do not distribute directly to the base, it is instead resisted by the walls. These pressures surely varies with type of material and depth.

As far as silo supporting system is concerned, only the weight matters, unless the unloading OR unloading is not geometrically symmetric.

As far as wall design is concerned, variation of all these with depth becomes an issue. You then apply to Rankine or Janssen's formulas. They report exponential distributions, if I remember correctly.

In addition to that, the pressures change between static, loading and unloading conditions. They adjust that with some coefficients for use for vertical, lateral and friction.

I dont know how walls(slosh-like) take up seismic pressure, but design of support sytem for seismic load is usually based on a force applied at the centre of mass of the loaded silo or bin.

One other good reference is the old Fintels handbook of reinforced concrete. Unfortunately concrete walls rarely "slosh" and there is no such discussion there.


respects
ijr