baseplate/column in uplift
baseplate/column in uplift
(OP)
how do you confirm capacity of simple column baseplate in uplift conditions. Uplift dived by 4 bolts (plus any prying force). Baseplate?
thanks.
thanks.
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baseplate/column in uplift
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RE: baseplate/column in uplift
RE: baseplate/column in uplift
RE: baseplate/column in uplift
1. Baseplate bending
2. H.D. Bolt capacity
3. Footing for ulift
RE: baseplate/column in uplift
RE: baseplate/column in uplift
bolts "inside" the column? "outside" the column?
RE: baseplate/column in uplift
RE: baseplate/column in uplift
RE: baseplate/column in uplift
RE: baseplate/column in uplift
RE: baseplate/column in uplift
AISC design guide One uses similiar approaches
RE: baseplate/column in uplift
RE: baseplate/column in uplift
The steel institute has put out publications regarding the design of baseplates. Immediately when I hear a 610UB bracing column I would think 25mm thick baseplate, possibly a 40mm plate depending on the magnitude of the uplift forces.
Basically, the axial force is assumed uniform across the UB cross section and must be transferred into the anchor bolts by plate bending.
I have posted pp 239 from the Australian Steel Institutes publications 'Design of Structural Connections'. The basic equation that it breaks down into is
ti=sqrt(Nt*bt/(0.225*be*fy*nb))
My calculations show that a 40mm baseplate can take an axial tension of 157kN (35kips) while a 25mm baseplate can take 61kN (14kips).
Didn't look in great depth to the notes that spats posted but I'm sure that they will produce similar results.
All the best.
RE: baseplate/column in uplift
those numbers don't sound right.
An expert is a man who has made all the mistakes which can be made in a very narrow field
RE: baseplate/column in uplift
RE: baseplate/column in uplift
RE: baseplate/column in uplift
RE: baseplate/column in uplift
Oneintheeye, given you are in the UK I WOULDN'T suggest adopting the attached design values from the attached for your design, As I know the baseplate configurations used in the UK differ from the Aust.
An expert is a man who has made all the mistakes which can be made in a very narrow field
RE: baseplate/column in uplift
RE: baseplate/column in uplift
Last Time I checked I believe the UK standard was to have bolts outside the flanges, grout holes, and a few other local standards. These don't match the aust way and analysis.
An expert is a man who has made all the mistakes which can be made in a very narrow field
RE: baseplate/column in uplift
I wouldn't be able to prove that a 25mm baseplate and transfer this force thru bending?
I'll dig out my AISC baseplate guidelines and green book and see where my calculations are going wrong.
I also wouldn't call up M30's, I would use M20's.
RE: baseplate/column in uplift
Call me captain dangerous, please note that 700kN is for pure tension, if you were to combine in shear as required you bolt capacity will reduce the overall component strength.
Don't ask me if you can develop the M30 bolts in the footing this I don't know. Nevertheless the M20-24 rule only applies to 8.8 bolts, it would impose high construction tolerances to use 8.8/s for foundation bolts, in my experience M30 4.6/s are not uncommon.
An expert is a man who has made all the mistakes which can be made in a very narrow field