Elastic buckling stress of unsymmetric section
Elastic buckling stress of unsymmetric section
(OP)
I am trying to check the capacity of a small member per F-12 in AISC 360. For LTB it simply says to determine the elastic buckling stress by using a textbook. I have 2 mechanics of materials texts and an advanced mechanics of materials text, but can't find anything regarding the elastic buckling stress of an unsymmetric section. I have information regarding bending and determing the principal axes for an unsymmetric section, but nothing regarding the elastic buckling stress.
Does anyone have a referene they can point me to?
Does anyone have a referene they can point me to?






RE: Elastic buckling stress of unsymmetric section
you know the applied stress, from your bending calcs, the allowable is limited usually by short column failure of the remote flange.
RE: Elastic buckling stress of unsymmetric section
I am trying to track down a reference.
RE: Elastic buckling stress of unsymmetric section
carefull what you look at tho'; most times they're considering the entire section loaded in compression. in your case it's probably sufficient to consider only the flange, or angle that's in compression. you're looking for the method that considers individual flanges. call if you need help !
RE: Elastic buckling stress of unsymmetric section
RE: Elastic buckling stress of unsymmetric section
RE: Elastic buckling stress of unsymmetric section
if b/t of the compression flange is <5, then your allowable is fcy
if it is > 10, you're probably looking at a crippling limit.
b is the flange width (in your case sounds like the distance from the neutral axis to the extreme fiber)
if there is a lip on the end of the flange, then consider the flange to be stable (pretty much any practical lip will accomplish this) and the lip is the critical element.
becareful if the flange thickness is greater than the lip thickness ... much less likely that the lip will support the flange.
RE: Elastic buckling stress of unsymmetric section
RE: Elastic buckling stress of unsymmetric section
RE: Elastic buckling stress of unsymmetric section
RE: Elastic buckling stress of unsymmetric section
RE: Elastic buckling stress of unsymmetric section
RE: Elastic buckling stress of unsymmetric section
Please look at a German Paper by Professor Dr. Ing. W. Mann on RC members , Beton und Stahlbetonbau, Feb 1976
or Professor Dr. Tekn- M.P.Neilsen, Bygningsttatiske Meddeleser, No. 4, 1997.
HTS
RE: Elastic buckling stress of unsymmetric section
Re: Theory of Elastic Stability- that is an old old reference- lots of work has been done since then- use with caution.