I'm trying to follow an example of calculation of members for a rigid rectangular frame in its most common form - a top member UDL, and an assumed lateral load the frame should be able to resist, stated without explanation to be assumed 2.5% of the top load.
The example I'm working from is sketchy. As stated, it says to take 2.5% of top load as an assumed lateral point load at the worst location, the top corner of the frame. So far so good. Then it just says to refer to the Steel Designer's Manual for rigid frame formulae. I've found the formulae applicable to my working example:
But unhelpfully, the worked example just stops there, and says "Calculate MA and MB and use these to check the post profile and connection requirements."
I'm not interested for now, in the bolted connections themselves, just in the post profile. I have a post profile already in the example (it's needed to obtain I1 in the first place). But having derived MA and MB, what is the correct method to confirm the post profile is indeed acceptable for this frame?
