Steel I-Beam Web Crippling - When to check

[ChrispyBacon]

I had an interesting question the other day from a PHD engineer: Design a steel beam.
Sounds simple enough.
My approach is to check the section class (web thickness to depth ratios), check the moment capacity of the section, Shear, member strength, deflections - and you're done, on to connections. He mentioned that I missed out web crippling. My view is that if you have a member where the governing force is the moment, that crippling of the web (unless it's a slender web) is unlikely. It is only when shear becomes the governing force that crippling may occur and should be checked.
What are the thoughts on this?

 

[civeng80]

Totally agree with you.
Very rare to have web crippling. Perhaps in very short beams with large point forces and large shear at supports, would check for web crippling and buckling.

 

[hokie66]

Web crippling, and also web buckling, are conditions which need to be checked or satisfied for beams which bear on their bottom flanges. These strength checks may not often control, but in certain conditions, they can.

 

[fegenbush]

I agree with hokie66. It takes almost no time to check web crippling when you are bearing on the bottom flange. In my practice, I have encountered compression of the entire section more than the bearing on the bottom flange, but the procedure is the same.

 

[KootK]

Most of us employ standard details that make gratuitous use of stiffeners at bearing points and concentrated loads. That further reduces the likelihood of crippling issues. Still, awareness is definitely a good thing.

The greatest trick that bond stress ever pulled was convincing the world it didn't exist.