Pullout boxes - shear capacities
Pullout boxes - shear capacities
(OP)
Hi guys, having a little bit of a wonder regarding calculation of shear capacities of the reo in a pullout box is (for use in a jumpform application). Looking at manufacture's design guides are bit odd to me - for example Reid's design guide seems to dip into AS4100 bolt/pin connections by including the 0.62 factor seen in clauses 9.2.2.1 and 9.4.1, but with a phi of 0.6 which seems to come from AS3600 for fixing. I've also heard of using phi = 0.36 (I think a doubling up of 0.6 from AS3600 and some other clause regarding an additional 0.6) but nobody seems to be able to point to me where that additional 0.6 is pulled from. Using 0.36 makes enough sense to me, just would like some guidance as to where numbers are being pulled from and/or why Reid seems to mix and match.
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RE: Pullout boxes - shear capacities
Do you mean
Vf = 0.62 fuf kr(nnAc + nxAo) in 9.3.2.1 and,
Vf = 0.62 fyp ns Ap in 9.5.1
This is a factor for shear distribution over a circular cross section and is not a capacity reduction factor. phi=0.8 then applies in both cases to get the design capacity.
RE: Pullout boxes - shear capacities
RE: Pullout boxes - shear capacities
Correct.
Perhaps a better way to rephrase my question is more along the lines of asking what the correct value for converting tensile yield/ultimate tensile stress for typical 500N rebar compared to the 0.62 given from the bolt grades in AS4100.
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RE: Pullout boxes - shear capacities
I would not rely on the tensile strength of the reinforcement, just the yield strength.
RE: Pullout boxes - shear capacities
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Why yes, I do in fact have no idea what I'm talking about