RBS (Dogbone) on an HSS 6

[Althalus]

We have an ordinary moment frame using HSS. As you can imagine, welding is a big deal. We have some seismic activity to worry about. So, Omega on the connections are creating welds that are much larger than the wall thickness of the HSS.

So, I was thinking of introducing a reduced beam section by cutting out an oval on the top and bottom of the HSS. Calculating the reduction in Zxx and Ixx would be fairly simple.

Is there any pitfall here that the community can warn me about for this methodology for HSS?

 

[JLSE]

If youre doing an OMF, I dont understand why the loads are so large... that the HSS is fine, but the welding is problematic. How about a CPJ? .. increase the depth of the HSS beam to reduce T&C? Go with WF columns to add continuity & doubler plates?