Cold Form Webbed Floor Joist Minimum Wall Bearing Required

[TekEngr]

Any one can tell me what is the minimum wall bearing required as support for cold form floor webbed joist??

 

[jayrod12]

4" (100mm) is fairly standard. However you'd likely want to look at the manufacturer's information. Anyone producing these will likely have some documentation on them including details such as bearing, bracing, opening sizes etc.

 

[BSVBD]

I would think that if you have a Product Design Manual or Specifier's Guide, the minimum requirement would be in there. If not, the bearing would be dependent upon what you are bearing on.

Otherwise, regardless of what any guide might have, you still need to determine or verify the bearing length on your own depending upon the reaction and what material you are bearing on.

 

[BSVBD]

Are you sure you're dealing with "Cold-Form" Steel "webbed" floor joists or could you possibly be referring to SJI Open Web Steel Joists? Or do you mean simply cold-formed joists? When you say "webbed", that makes me think of diagonal webs. Please clarify.

I've seen cold-formed roof trusses, but, i've never seen cold-formed (diagonal) open-web floor joists.

 

[TekEngr]

@BSVBD

http://www.newcastlesteelframes.com.au/userfiles/Image/products_joist.jpg

please see the link , that what i am talking about the cold form webbed joist

reaction are about 21 KN and bearing wall is 150 mm wide so i can support my 2 webbed joist on it this mean 75mm wall bearing will carry each floor joist is this enough?

 

[KootK]

I'd count on 65 mm bearing to allow for some tolerance. That should be plenty for such an application as the construction of the joist suggests that bearing stress will be concentrated mostly over the with of the last vertical web anyhow.

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.

 

[KootK]

Is your bearing wall also cold formed? Will you align your studs with the joists? Will you use a concentional top track?

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.

 

[TekEngr]

@Kootk
yes bearing wall is cold formed and studs are aligned with joists, yes there is a top track running.