Combining Primary and Secondary Stress in Monorail
Combining Primary and Secondary Stress in Monorail
(OP)
I'm looking into the monorail design procedures.. do you combine the secondary stresses from flange bending and web tension with the primary bending and axial stresses? I'm looking at Alex Tomanavich's spreadsheet from steeltools.org, and it looks like he does not and I'm a bit concerned about it. And if so, is the stress ratio of actual/capacity < 1 suffice, or is there other factors for combining these stresses?
FYI, I have looked at past threads and haven't really found anything on this.. I don't mean to repeat something that's already been answered.
Thanks!
FYI, I have looked at past threads and haven't really found anything on this.. I don't mean to repeat something that's already been answered.
Thanks!






RE: Combining Primary and Secondary Stress in Monorail
Dave
Thaidavid
RE: Combining Primary and Secondary Stress in Monorail
Taking a quick look at the Tomanavich spreadsheet, it appears to me that the spreadsheet is already combining the beam bending stress with the flange local bending stress. Look at the formula for sigma,t0 which uses the square root of sigma,x sigma,z and tau,xz. It appears that sigma,z adds fbx and fby to sigma,z0 (fbx and fby are from the simple span equations and sigma,z0 is from the local flange bending equation). It doesn't appear to be including the overhang bending stress so just be careful if that's going to control your design.
www.structuralcentral.com