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Reinforcing Against Side-Face Blowout

Reinforcing Against Side-Face Blowout

Reinforcing Against Side-Face Blowout

(OP)
Does anyone have any recommendations as to how to quantify the required reinforcing to control side-face blowout of an anchor bolt near a free edge?  I can not go with a shorter anchor bolt since I need to lap it with the vertical dowels in order to get a ductil failure in tension.  Also, the orientation of the pier in the building does not allow me to move it in any further from the free edge than it already is.  Can I just throw stirrups in at 3" o.c. for the depth of the anchor bolt and call it good?

RE: Reinforcing Against Side-Face Blowout

If you are lapping with reinforcement then you don't need to worry about side face blowout.

RE: Reinforcing Against Side-Face Blowout

(OP)
Thank you StructuralEIT but in my case I am not tied to the vertical dowels and in fact the anchor bolts are 4"-5" away from the dowels so I do not think in my situation the lapping would prevent side-face blowout.  Just for the sake of argument lets say that I am not lapped with any vertical dowels.  I have several references for anchor bolt design that make the statement similar to "it has been assumed that adequate shear reinforcement has been provided to prevent sideface blowout."  but none of them go on to mention how to determine the appropriate amount of steel.  Just curioous how others are handling this when they come across it.

RE: Reinforcing Against Side-Face Blowout

If you are using a headed anchor then you do need to consider side face blowout even if lapping with reinforcement; see ACI318 App D. It is difficult to get enough properly anchored reinforcement to prevent blowout,

However you can thread one end of a renforcing bar and design using the normal anchorage and lap requirements for reinforcement.
a) use a bar larger than the thread diameter to allow for machining.
b) check manufacturer's recomendations for yield strength of remaining steel in threaded part.

See p10 of http://svc019.wic003pa.server-web.com/images/db_images/productspecs/REODATA.pdf

But check your own supplier as well!

RE: Reinforcing Against Side-Face Blowout

(OP)
Thanks for the tip sdz.  I guess I could always got to something like this if I am not able to quantify the required shear stirrups.  I know my customer will not like them, but hey, you gotta do what you gotta do.  I'm still holding out hope that someone out there has a reference they can point me to for sizing the shear stirrups.  I can't be the only one running into this problem.

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