CFS Web Stiffener

[BSVBD]

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1516919067/tips/Web_Stiffener_012518_kxxjrv.pdf[/url]

Please see attached...

The joist reaction requires a web stiffener.

Since I have a rollover tab (contractor preference), can the rollover tab serve as a sufficient web stiffener?

Can I remove the CFS (Cold-Formed Steel) web stiffener?

Thank you!

 

[KootK]

I'd be happy to ditch the web stiffeners so long as the top flange has effective lateral support over the bearing. You want to force a two wave buckling pattern over the height of the joist rather than a sway cantilever buckling pattern with the top flange drifting laterally relative to the upper bolt. I'd scrap the backside beam stiffener too.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[XR250]

Conservatively, I would check the web crippling for a 12GA joist whose height is approx. the distance from the top flange to the first bolt hole.

 

[txeng91]

You might consider one of these Simpson hangers or a Clark-Dietrich equivalent to reduce eccentricity on the steel beam and put the joist support condition in shear instead of bearing.

https://www.strongtie.com/joistfram...ands-hjct_productgroup_cfs/p/s.jct-and-s.hjct

https://www.strongtie.com/rigidconnectors_coldformedsteelconstruction/sjc_connect/p/sjc

I will say that I’ve gotten a lot of pushback from contractors on screwing into rolled steel, and I’ve seen framers go to town on similar clips with powder actuated fasteners instead of using the freaking holes that come with the damn clips. It’s just a thought, your detail might be best from a construction and quality control standpoint. I agree with Kootk on the joist and beam stiffeners, but depending on the beam depth and span, some sort of torsional bracing on the steel beam might be worth considering.

 

[Tmoose]

Are you asking that the 4X4 L be welded to the Beam B3 on the "hidden" regions of the 4X4 pocket?

Not quite as inaccessible as these -

http://www.arcraftplasma.com/welding/weldingdata/images/fig4-2.gif