Drukberekening in silo's met flexibele wanden. Een evaluatie van nieuwe
Report 98.3.TT.5106, Transport Engineering and Logistics.
Most existing studies of silo wall pressures were performed on stiff-walled
silos, so existing design equations may give poor predictions of pressures in
flexible silos. Almost all existing methods do not consider any interaction
between the stored material pressure and the wall deformation.
The goal of this study is to examine whether it is possible to make better
predictions of pressures in flexible silos by taking into consideration the
combined action of the stored material and the wall.
In this study the following recent attemps to predict wall pressures in
flexible silos are examined:
It is shown that both the Modified Janssen Theory and the finite element
analysis give better results in calculating wall pressures in flexible wall
silos. The Modified Janssen theory is more convenient in terms of practical
usage. In practice, the horizonal wall pressure can be about 20% smaller than
the wall pressure of the rigid-walled case.
- The finite element analysis (J.Y. Ooi and J.M. Rotter Wall pressures
in squat steel silos from simple finite element analysis, Computers
ans Structures, Vol.37 No.4 (1990), pp.361-374).
- The Modified Janssen Theory for flexible circular silos (Y.T. Feng and
Y.L. Hua Modified Janssen thory for flexible cicular bins, Journal
of Structural Analysis, Vol.122 No.4 (April 1996), pp.454-456).
- The String Theory (M. Kaminski and E. Wirska Interpretation of pressure
and displacement measurements of flexible silo walls using string theory,
Bulk Solids Handling, Vol.18 No.2 (1998)).
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