spiral (helix) metric reinforcement
spiral (helix) metric reinforcement
(OP)
I tried searching for his but did not find anything. I am performing a conversion of a design from metric to english/imperial and I cannot find anything to explicitly tell me the bar size of spiral/helical reinforcement in a cylindrical footing. The callout is as follows:
4-N16 vertical
R6 helix at 300 pitch
So there are four vertical 16mm (#5) bars and spiral reinforcement at 300mm (1ft) pitch. I suspect that the "N" on N16 refers to the type of steel. I am cannot determine the bar size of the helix however. My assumption is that it is 6mm diameter bar (in which case I would obviously use #3 bar in the US since that is the ACI minimum), but I can't confirm this. I do not think that the "R" could stand for "radius" because a 6mm radius bar converts roughly to a #4 bar which seems quite high for #5 longitudinal. It would also be a tight bend for #4 bars because the overall diameter of the pile is 1'-6".
If anyone can enlighten me on any of these matters I would be VERY appreciative.
Thanks.
4-N16 vertical
R6 helix at 300 pitch
So there are four vertical 16mm (#5) bars and spiral reinforcement at 300mm (1ft) pitch. I suspect that the "N" on N16 refers to the type of steel. I am cannot determine the bar size of the helix however. My assumption is that it is 6mm diameter bar (in which case I would obviously use #3 bar in the US since that is the ACI minimum), but I can't confirm this. I do not think that the "R" could stand for "radius" because a 6mm radius bar converts roughly to a #4 bar which seems quite high for #5 longitudinal. It would also be a tight bend for #4 bars because the overall diameter of the pile is 1'-6".
If anyone can enlighten me on any of these matters I would be VERY appreciative.
Thanks.






RE: spiral (helix) metric reinforcement
If so then the N is Normal ductility 500MPa reinforcing bar (diameter may be slightly less than number given) and the R is a mild steel round member 6mm diameter and could be only 250MPa.
RE: spiral (helix) metric reinforcement
Since it seems you are familiar with Australian design practices, I hope you can clear up a couple other things. The anchor bolts for this structure are M12 Gr.4.6/S H.D. bolts. In some cases this can refer to bent anchor bolts, in others it can refer to threaded rod, and in others it can refer to cap screws. I know what M12 gr.4.6/S means, but what does H.D. bolts refer to? I am not sure if it refers to the actual bolt (such as being a Heavy Hex bolt) or if it is how the part is labelled for purposes of the drawing itself.
Also, what is a "Cog 100 Bolt"?
Thanks
RE: spiral (helix) metric reinforcement
The cog 100 bolt refers to the hook which is 100mm long horizontally.
RE: spiral (helix) metric reinforcement
Cog 100 means what csd suggested. I would have just said "100 COG" or even dimensioned the cog on the section.
RE: spiral (helix) metric reinforcement
Cog is an odd word on a drawing in the states so I am going to change that to '4 in. hook' instead of 'Cog 100 Bolt'
While we're at it what does the abbreviation c/crs mean? It refers to a square bolt layout and I'm changing it to "o.c." but I'm still curious about the expansion of c/crs.
RE: spiral (helix) metric reinforcement
RE: spiral (helix) metric reinforcement
RE: spiral (helix) metric reinforcement
1. c/c; meaning centre to centre
2. crs; abbreviation of centres
RE: spiral (helix) metric reinforcement
Does anyone know what grade of steel CHS sections typically use? I assume it's similar to HSS (42ksi yield, 58 ksi tensile) but there are some CHS sections here that are smaller than anything available in HSS so I was going to use Pipe but Pipe is different than HSS (yield 35 ksi, tensile 60 ksi) so I want to make sure the pipe will work.
RE: spiral (helix) metric reinforcement
RE: spiral (helix) metric reinforcement
RE: spiral (helix) metric reinforcement
RE: spiral (helix) metric reinforcement
Thanks for the available sections brochure, this is what I've been looking for!
RE: spiral (helix) metric reinforcement
RE: spiral (helix) metric reinforcement
Using hot rolled should be conservative, for identical grades.
RE: spiral (helix) metric reinforcement
RE: spiral (helix) metric reinforcement
I'm guessing it could be true for the US also.
Using Hot Finished instead of Cold Formed isn't a problem, the reverse is (assuming identical grades).
RE: spiral (helix) metric reinforcement
RE: spiral (helix) metric reinforcement
ht
Hope this helps.