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RE: Stiffeners on bowed plate

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There are a lot of things to consider here.  In order to consider large
deflection theory you must have attachment points that can take the membrane
loads.  I suggest that you take a look at Gaylord and Gaylord book,"Design
of Steel Bins for Storage of Bulk Solids".  They have some tables for large
deflection of plates based on Timoshenko's work.  The membrane forces can
get rather high with small deflections.  Weld quality may also be a problem.

I have watched the addition of retro fit stiffeners on deformed plates.  A
good boilermaker can fit up a stiffener to the deformed plate rather easily.
With tack welds, bull pens, and heat from a torch they can pull the plate
straight.


Ron Hill
HILL Consulting Engineering
Birmingham, Alabama  USA
Email: ronhill(--nospam--at)mindspring.com

-----Original Message-----
From: Sherman, William [mailto:ShermanWC(--nospam--at)cdm.com]
Sent: Tuesday, August 24, 1999 10:01 AM
To: SeaInt Listserver (E-mail)
Subject: Stiffeners on bowed plate


I am evaluating a square steel bin which was not adequately stiffened, such
that the side plates have bowed outwards considerably (over an inch).  (It
is bowed when empty, i.e. plastic deformation of the plate has occurred.)
The bins have been in use for over 10 years, but the seam welds are cracking
in some locations.  I would like to add steel stiffeners to the outside of
the steel bin, but I am not sure how easily stiffeners can be fabricated to
match the bowed shape.  Does anyone have advice on how to add stiffeners to
a bowed plate economically?

I am also curious if anyone knows of a reference for bin design which
considers "large deflection theory", i.e. development of membrane stresses
in addition to flexural stresses in the side plates.  I cannot determine
what the original design of this bin was based on - most of the references I
have are based on providing stiffeners to control flexure in the side
plates, but one reference states that large deflection theory could be
considered.


William C. Sherman
Camp Dresser & McKee, Inc.
Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)cdm.com