Capacity of rebar developement with less than a standard hook
Capacity of rebar developement with less than a standard hook
(OP)
I have a situation where I need to use a hooked rebar but do not have sufficient room for a standard hook. Is there a way to calc the capacity with less than Lhk? I am using #3 bar but can only fit 4" hook.






RE: Capacity of rebar developement with less than a standard hook
1. You can always rotate the bar along its main axis to orient the hook at something other that vertical or horizontal - sometimes that allows a hook to fit.
2. You can also use 180 deg. hooks
3. There was a discussion on another thread here recently where others suggested mechanical heads on ends of rebar to create anchorage. I haven't done that before but might be a possibility.
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RE: Capacity of rebar developement with less than a standard hook
In my case I do not need the full capacity of the #3 bars and the hooks have already been improperly installed with the short hook. I am trying to find out if I need the needed strength. (The contractor sent me a photo which showed the short hooks.)
RE: Capacity of rebar developement with less than a standard hook
CRSI Standard 90o Hook for #3 is 6" long. The existing rebar hook is 4" long.
Therefore assume approximate hook capacity = 4"/6" or 67% of standard hook capacity. That is probably a conservative value.
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RE: Capacity of rebar developement with less than a standard hook
DaveAtkins
RE: Capacity of rebar developement with less than a standard hook
Typically only do it when I'm adding a 4" housekeeping pad or similar to an existing slab in a military building where they want to see a calculation for absolutely everything.
RE: Capacity of rebar developement with less than a standard hook
This is a Calif. jail so it needs justification for everything.
RE: Capacity of rebar developement with less than a standard hook
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: Capacity of rebar developement with less than a standard hook
RE: Capacity of rebar developement with less than a standard hook
Minimum structural integrity requires 1500 plf but I will get additional tie in at the topping slab for that. This connection is primarily for erection stability.
RE: Capacity of rebar developement with less than a standard hook
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: Capacity of rebar developement with less than a standard hook
RE: Capacity of rebar developement with less than a standard hook
RE: Capacity of rebar developement with less than a standard hook
Where is the language regarding the development of a short embedded hook if you provide a longitudinal bar on the inside corner?
I know that you can get away with a stirrup hook compared to a standard hook if you have a bar in the inside corner. ACI 318-05 12.13.2.2.