shear tab welded to supporting member and supported member

huangyhg

shear tab welded to supporting member and supported member
does anyone see an issue with welding a shear tab to both the supporting and supported member?  aisc only provides a procedure for bolting to the supported member.  is there a reason for that?
it makes an overly stiff pinned connection.
there is no mechanism to develop a pin with this connection.  bolted shear tabs have bolt holes to allow some rotation.  clip angles and end plates will flex when loaded.  a welded-welded shear tab has none of these.
the fact that aisc is silent on this topic should also raise some red flags.  i'd recommend avoiding this one like the plague.
they don't rule out slip-critical bolts which is a little curious.  that would make for an equally stiff pin, right? especially if you design for slip at strength levels.
that's another question.  if the bolts are the pin mechanism in this connection, then why is the moment on the supporting member ignored?  it seems like the shear tab is a small cant off of the supporting   
if the supporting   
you can model the behaviour with a 3d model. ansys, visual nastran etc cand do it. even with simpler -to this purpose- programs it can be studied.
redundancy is always a plus to final strength. there is also the code question, sometimes merely trying to keep the things in a particular practice, but sure there must be others that also work.
why in the world would i want to model this with software?!
i have a similar problem.  my shear tab is concurrently a shear connection and an axial load transfer mechanism for a diaphragm drag strut.  lsl bolt holes were provided which kinda screws up my whole drag strut arrangement.  i'm contemplating having the tab welded to the supported   
kootenya-
i would be careful with welding like that.  you don't want to initiate a crack and have it unzip.  can you provide slip-critical bolts in the lsl?
that's a neat idea seit.  i might just do that.  are we not concerned about the moment resistance of the bolts once they are slip critical?
also, do welds really unzip?  don't they have some minor ductility themselves?