Orientation of hook anchor bolts
Orientation of hook anchor bolts
(OP)
My basic question is, does the orientation of hook of hooked anchor bolts matter? if they are outward or inward? if all in same direction or some toward each other and some away ?
I know that is recommended not to use them but I wonder when they were allowed to use, if there was any requirement on the orientation of the hook.
Thank you
I know that is recommended not to use them but I wonder when they were allowed to use, if there was any requirement on the orientation of the hook.
Thank you






RE: Orientation of hook anchor bolts
For yours I'd either turn them all towards the center or orient them to be parallel to the face of the concrete (so they will all be 90 degrees from the adjacent one).
Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com
RE: Orientation of hook anchor bolts
1) If there's a moment involved creating a T/C couple, point the hooks of the tension bolts towards the source of the compression. This suits the flow of stresses in the joint.
2) For all other cases, point the hooks towards the "meatiest" part of the member. More cover on the hooks usually improves capacity.
3) In all cases, consider congestion problems.
Pretty tough to enforce all this though. #3 is king on site of course.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Orientation of hook anchor bolts
Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com
RE: Orientation of hook anchor bolts
Some codes in high seismic zones [at least in the case of NZ and MX] specify that hooks [whether bolts or rebars/dowels] should be pointing inward, I assume because of the protected core.
RE: Orientation of hook anchor bolts
I assume you meant NZ is Newzeland and MX is Mexico?
My project is in U.S., do you know any old A.C.I or else code had any statement on the orientation of the hooks?
Thank you
RE: Orientation of hook anchor bolts
So you see a reference, it's in McCormac's reinforced concrete book.
https://books.google.com/books?id=_wclCgAAQBAJ&...
RE: Orientation of hook anchor bolts
21.10.2.1 Longitudinal reinforcement of columns and structural walls resisting forced induced by earthquake effects shall extend into the footing..
RE: Orientation of hook anchor bolts
Thank you very much buddy.
Just may I ask what edition / year ACI are referencing to?
Is it clearly says about the hook orientation?
I may not have that version/editon of code - may I ask for a big favor and if you have that particular page scanned possibly.
Million thanks
Respectfully,
SKJ25POL (Structural)
RE: Orientation of hook anchor bolts
RE: Orientation of hook anchor bolts
Thank you so very much, very much appreciate it.
Have a good weekend
Thank you again
RE: Orientation of hook anchor bolts
Hooked dowels in a common, concentric footing are likely to be well confined laterally regardless of the orientation of the hook. The issue is joint design for flexure as informed by srut and tie modelling etc. Essentially, the tension rebar is restrained from pullout by it's containing the opposing column compression force coming down into the knuckle of the hook (ish).
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.