135 degree hook

[WARose]

I got a situation where (because of space) I need a 135 degree hook (instead of a 180) to develop a bar. (The bar will hook around a bar going in the other direction.)

Will this develop like ACI's "standard" hook (i.e. 90 and 180)? I ask because I've only used the 135 in a torsion or seismic application.

Seems like I saw something about this in a non-USA code once.....but cannot remember.

Thanks.

 

[KootK]

Will this develop like ACI's "standard" hook (i.e. 90 and 180)?

Surely. I'd give it the extension length of whichever normal arrangement is longer if they are different.

 

[WARose]

THanks Kootk. It seems logical (considering the other uses....but the code isn't real explicit in that regard.

 

[hokie66]

Yes. We always specify 135 degree hooks for ties in circular columns.

 

[racookpe1978]

For my info only, a 180 hook is very clear. But is a 135 only a partial curve (more open) or a more complete curve (more closed) than a 180?

 

[BridgeSmith]

racookpe, it's more open - halfway between a 90 degree hook (which is an "L" shape) and a 180 degree hook.

 

[EDub24]

I think that’s feasible. If you think about it, the standard hook lengths for a stirrup or tie is the same as a regular standard hook. The only difference is for smaller bars (#3-#5) where the lengths are respectively smaller.

 

[Chickenhawk6451]

If it helps at all Australian Code says to treat it the same as a 180° bend for development length which is 3x bar diameter bend radius + 4x bar diameter extension.