CFS Web Stiffeners
CFS Web Stiffeners
(OP)
The roof has a 96 PSF snow drift load.
The 10x162x12 gage roof purlins I have sized have a total reaction of 1,300 LBS.
How do you know if you need web stiffeners at the end bearing?
Following an SSMA Product Technical Information guide, the Web Crippling Load Tables show an Allowable Web Crippling Load of 2,396 LBS for 3.5" bearing. However, Note #1 says, "Only members with stiffened flanges are considered."
If that is the case, how, then, do I determine the allowable load for an UNstiffened member?
I have no problem specifying web stiffeners, but, I want to be efficient and wise. I don't want to stiffen the webs if not necessary.
Thank you!
The 10x162x12 gage roof purlins I have sized have a total reaction of 1,300 LBS.
How do you know if you need web stiffeners at the end bearing?
Following an SSMA Product Technical Information guide, the Web Crippling Load Tables show an Allowable Web Crippling Load of 2,396 LBS for 3.5" bearing. However, Note #1 says, "Only members with stiffened flanges are considered."
If that is the case, how, then, do I determine the allowable load for an UNstiffened member?
I have no problem specifying web stiffeners, but, I want to be efficient and wise. I don't want to stiffen the webs if not necessary.
Thank you!






RE: CFS Web Stiffeners
RE: CFS Web Stiffeners
RE: CFS Web Stiffeners
Calculate the buckling capacity of the web via the AISI specifications. They are FREE @ http://www.cfsei.org/free-publications
"It is imperative Cunth doesn't get his hands on those codes."
RE: CFS Web Stiffeners
RE: CFS Web Stiffeners
Frankly, I sometimes question our reliance on such slender elements. If a fairy stepped on a 1 mm flange lip and it straightened, apparently Armageddon would ensue. No problems in the field that I am aware of however.
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.