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Portal Frame Analysis with semi rigid base plate connection

Portal Frame Analysis with semi rigid base plate connection

(OP)
Is there any reference in any aussie code or manual to design a portal frame with a semi-rigid base plate connection? Would anyone know how to do this/analyse in space gass?

RE: Portal Frame Analysis with semi rigid base plate connection

Just responded to this in the structural other topics forum. You will find reference to a previous discussion on this matter there.

I'll repost here anyway. thread744-260012: Base Stiffness and AS4100

I haven't used spacegass in a while but instead of assigning a fixed moment restaint you assign it free and give it a rotational stiffness. Might be something like 1E6 (N-mm/rad) under the Kz or whichever way you have your frame orientated.

RE: Portal Frame Analysis with semi rigid base plate connection

(OP)
Thanks asixth, that makes it a little clearer after reading all that. My concern is designing a cold formed portal frame with a moment base connection. The column base connection comprises of a large bracket cast into the concrete with each flange of the bracket being bolted to the two column flanges. This connection no doubt will take a significant amount of moment in the structure. Is there a way to convert this moment connection into a stiffness I can input into my calculations/space gass?? I realise that cold formed portals should probably be done by plastic analysis, but I want to know about the connection stiffness also. Can you offer any comments on that?

RE: Portal Frame Analysis with semi rigid base plate connection

Not really. I don't design cold formed other than propriety purlins and the occasional metal stud wall. Whenever I'm looking at moment transfer at the base plate I generally play around with the rotational stiffness until I achieve the balance between moment transfer and base rotation that I feel comfortable with.

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