Originally Posted by cnwinamp

We will install 10 Al silos for PP storage. Zeppelin will make them for us.

They give me a requirement for the silos foundation (Sheet G).

The beams supporting the silo base ring must be designed in such a way that the

deflection will be possibly uniform for different filling heights of the adjacent silos.

For calculation of the support beams considering the main loads (symmetric

loads) the admissible difference in deflection must not exceed the following value

corresponding to

f <= (1 / 2500)* silo diameter.

By this limited difference in rigidity between the individual beams the support

loads in theory will not change by more than +/-15 %

I am not very clear what they went? Does some one can give me a detail explain for this?

Why they need so rigorous for difference of deflection?

For this project, all silos will equipped with 4 load cells for weighting. And 6 of silos will support by steel structure. Our civil engineer said it is very different to get so small deflection difference.

I also went to know we must follow this or not?

Can we have other solution?

Thinks

==========================================================

Zeppelin wants you to do the foundation work

properly simply because a silo may have a portion

of its loading stuck and it may shift and create

enough side pressure on the silo wall top actually

knock it over simply the en mass movement of

the material.

Your silos will be huge sails in the wind creating a

lot of wind resistance and the wind speed is

pushing against the silo walls of each of the silos,

this force is transmitted to the steel of the silo and

the foundation of the silos.

You need an architect to design a proper foundation

for your location as you may need much more work

with gravel stone and concrete and if the proper

foundation is not installed it will not be covered by a

warranty for the silos

Please type silo failures in your search engines text

box and you will see many examples of silo failures.

lzaharis ■

The load conditions should be given to you by the Supplier, on his drawings. They will already have accounted for wind & eccentric loading.

Note that assymetric loading is discounted for this particular foundation consideration.

What your question/description implies is that the deflection of any/the largest ring beam should not exceed 1/2500th of the smallest silo diameter plus that silo's foundation deflection. That should be a cakewalk for your civil engineer.

The Supplier is simply protecting his/the connecting pipe & ductwork against unforseen differential settlement which was not examined, mentioned nor requested by either party during the bidding. ■