Re: Modified Reimbert Theory By Mr. Rotter
The DIN covers different height/diameter ranges with 3 different theories, which apply for certain height/diameter ranges.
- Janssen's Equation 2 < H/D
- Modified Reimbert by rotter 0.4 < H/D < 2
- Retaining wall theory HD < 0.4
At the transitions of the different theories, eg , near H/D = 0.4 or H/D = 2 , there is a possible gap in horizontal wall pressure for the different theories at the same H/D boundary when the original Reimbert theory is used.
This possible gap is narrowed due to the modified reimbert theory by rotter. The modified theory makes for a smoother transition at the boundary H/D ranges.
Still, this modification must have been backed up by some sort of theoretical background.
Mr Rotter wrote a book about silos :
Guide for the economic design of circular metal silos
Interestingly enough, in this book, only the original Reimbert theory is mentioned. ■
Silos With Conical Inserts
Dear All,
I am working on Design of Silo with Conical inserts.
I am referiong to following
1. DIN 1055 Standard
2. Book : Handling of Bulk Solids By P.A.Shamlou
3. Journal Paper :Theoretical wall stresses and insert loads in a bin-hopper with a conical insert using the differential slice method
I am still not able to get the Peak Pressure Values at transition.
If someone could provide the guidelines for Design of Silo with Conical inserts it will be beneficial.
Thanks ■
Modified Reimbert Theory by Mr. Rotter
Dear people,
the DIN 1055-6 2005 uses a modified reimbert theory by rotter to calculate wall pressures for squat silos. The original reimbert theory delivers the following formulae for the horizontal wall pressure :
Sigma h = ph0 * ( 1 - [ (z - h0)/(z0 - h0) + 1 ]^-2 )
This formulea can be retrieved from the theory, originally set up by Mr Reimbert.
The horizontal wall pressure from the modified reimbert formulae by Mr rotter equals :
Sigma h = ph0 * ( 1 - [ (z - h0)/(z0 - h0) + 1 ]^-n )
n = - ( 1 + tanB )( 1 - h0/z0 )
This exponential factor n does not follow from reimberts theorie.
Does some1 know where to find the theoretical background for this modification?
Tx in advance ■