Is it possible to
pressurize it? Even 1 psi is 144 psf. Even a small pressure could
resist the concrete pressure. Just a thought.
H. Daryl Richardson
----- Original Message -----
Sent: Wednesday, October 27, 2010 7:43
Subject: Re: shell stability
My problem is a large steel tank being used as a form
for its own outer concrete shell with welded ties keeping the shell from
buckling during the pour.
Timoshenko's "Theory of Elastic
Stability" was my
knee-jerk-reaction reference. I also looked into Roark (which actually
cites Timoshenko's formulas for arches, not shells), as well as Vol'mir's
"Flexible Plates and Shells", "Guide to Stability Design" (Galambos), and
several designer's handbooks.
Unfortunately, none of these
sources provided a clear-cut solution for a problem at hand. For
example, the Timoshenko's formulas (referenced in Roark) do not appear quite
applicable to shallow arches (my case), while other formulas that are
applicable to such arches lead to quite paradoxical and seemingly theoretical
I ended up modeling the shell in 3D
FEA, evaluating stresses, analyzing the deflected shapes, and still applying
the Timoshenko's arch formulas. The results appear reasonable and
corresponding to the field observations.
Roark's Fomulas for Stress and Strain has and appropriate
entry under paragraph 13.5, "Thin Shells of Revolution under External
Pressure", as well as Table 13.1.
It also has a calculated example thereto all right.
October 2010 23:50, Steve Gordin <sgordin(--nospam--at)sgeconsulting.com> wrote:
> I am looking for a source of Practical analysis
> Shallow - Thin - Cylindrical Shell/panel
> Uniform Radial Compression.
> The books I have
on the subject turn to be of mostly academic value.
anyone point me in a right direction?
> Steve Gordin SE
Civil/Structural design & inspection engineer,
MSc Structural engineering, Ph.C. Engineering
ONILAES Lab at
Tel. +38 068 4079692
Fax. +38 0562