backup for concentrated load assumption

[bridgetrool]

For years we have gone under the assumption when temporarily supporting beams at a distance less than d/2, if welded bearing stiffeners existed between load and end of beam, that d/2 or near end of beam did not apply. We have recently been asked to supply backup for our assumption. Can anyone help?
thanks
bridge trool

 

[paddingtongreen]

We need more information on what you are describing. What does, "that d/2 or near end of beam did not apply" mean?

I associate d/2 with concrete but you have welded stiffeners so it must be steel.

Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin

 

[bridgetrool]

paddingtongreen, thanks for the interest

AISC 9th, chapter K, pg. 5-81

Local Web Yielding
b. When the force to be resisted is a concentrated load applied at or near the end of the member.
use K1-3

Web Crippling
b. When a concentrated load is applied less than a distance d/2 from the end of the member.
use K1-5