cold formed portal frame of 22,5 m span

[Islem]

Hi,

I am actually designing a cold formed portal frame of 22,5 m span , i wonder if i need strap bracing between frames to ensure the lateral stability of building and avoid local buckling of chords?

thanks

Islem.


islem

 

[jayrod12]

You're going to need to provide much more information including intended loading and a sketch showing geometry.

 

[XR250]

That seems like a big span for a LG portal frame. I think if you are asking these questions, you might want to get someone more familiar with Light Gage framing to help you.

 

[Islem]

In this case that the top chord is maintained by purlins ,in the other side the button chord is free .
Purlins used to act as permanent bracing shall be adequately attached to the top and bottom chords and to a diagonal brace or diaphragm. Purlin spacing shall be considered in determining the design buckling strength of the top chord.

islem

 

[Teguci]

https://www.eng-tips.com/viewthread.cfm?qid=172456