Shear Flow - Reinforcing One Side of Existing Beam

[CES Eng.]

Hi All,

I'm new to the forum and was hoping someone could help me out with the following problem. I have an existing WF garage header that has significant section loss on the top and bottom flanges. We have come up with the following repair (see attached sketch). We plan on attaching a new channel to the existing section to build up the member. That being said, we are using plug welds to attach the two sections together. What would be the best way to confirm the amount of weld we are calling for is appropriate? This seems like a shear flow problem, but the neutral axis' being almost identical leads me to believe that my values are incorrect due to my calculation of "y'" & "A'". Any help would be greatly appreciated, most of the examples online are typical top/bottom reinforcement designs where the "Q" is obvious.

Thanks!

 

[dik]

Shear connection would be minimal... just to ensure each component is being loaded as intended. Rather than plug welds, can you simply bolt the two parts together?

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[BAretired]

There is very little shear flow between the existing section and the new channel. I agree that bolts would be a good solution. If the new channel is lowered 1/4", there is no shear flow between sections, so the bolts would be nominal.