Expansion joint at re-entrant corner 1

[GalileoG]

I've attached a screenshot to help explain. I have an L-shaped structural steel building (steel columns and roof OWSJ) with diagonal cross bracing at building perimeter. I need to place an expansion joint at the re-entrant corner due to building length. Under horizontal loading in the direction shown, how would I be able to transfer the diaphragm shear from Diaphragm 1 into the bracing at Grid B? The expansion joint is offset to the left of Grid B.

I imagine all that diaphragm shear transfer into the roof beam left side of expansion joint (strut), which is then transferred as point load to the perimeter beams which span left to right (point load out-of-plane of perimeter beam). This out-of-plane point load is then transferred into Grid B via the end connections. Is there a better way to do this?

 

[Chessanyone]

Do you need to allow differential movement in both directions or just perpendicular to the expansion joint? If you need to allow differential movement in both directions, I think you’re stuck and you need to introduce a new lateral element on that side of the expansion joint. If only perpendicular to the expansion joint, you can use a drag strut on (and parallel to) B-Line with horizontal slotted holes (perpendicular to the expansion joint) with a slide bearing connection to allow movement in the left/right direction.

 

[HTURKAK]

Can you post the roof plan with HBs and VB's and the sizes? Is it possible to provide VB at the left of the Grid B?



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[dik]

Can you do something like:

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

-Dik

 

[GalileoG]

Dik,

No I cannot put x-bracing left of Grid B.

Chessanyone,

Free movement is only needed perpendicular to expansion joint. So a slotted connection will be provided. Actually, what you said is what I was thinking, which is to have a strut on each side of the expansion joint. The connection to Grid B would need to be designed for out-of-plane force. Just wondering if there's a better way.

 

[dik]

Then you likely have a fairly large load to transfer via slotted connection.

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

-Dik