Anchor Rods connected from both sides

[tristan861]

Please see sketch.
Is this type of connection eliminate the anchorage checks? (Breakout, Pullout...).
I believe it does. but IS there any additional checks I should be aware of? (for example; the concrete surface near the nuts? )

Thanks guys.

 

[dik]

Through bolting is very positive and straightforward... you need to check for tension and shear... no gremlins in the works as long as the concrete is sound and can accommodate the loading.

Dik

 

[KootK]

I don't believe that this scheme eliminates breakout checks. It just moves the failure frustum to the far side of the concrete member and produces something more closely resembling punching shear.

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.

 

[tristan861]

Yes exactly, this means it depends on the concrete shear capacity not the breakout of concrete. Am I right?

 

[KootK]

I would say that the concrete shear capacity IS the breakout strength in this instance. Given the lack of explicit guidance for through bolting, I think that one could either use a modified 318 app D approach or a punching shear with moment approach. This assumes that you're far from a free loaded edge such that shear breakout is improbable. I'd seek a connection that minimizes the moment imparted to the wall.

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.

 

[atrizzy]

It's actually both.

Say you're connecting to a column with 2 bolts in tension. You need to check that the bolts don't break through the concrete column, as well as that the column section as a whole can resist the shear. This would only really be a problem if your bolts didn't have a large backing plate bearing against the column though. If they were bearing purely against a washer then, as KootK says, you'd be looking at a punching shear problem.

 

[JoshPlumSE]

Throw a plate on the back side and I'd say that yes, it eliminates the breakout checks (for tension) and you now have something like a "punching shear" check instead.

 

[tristan861]

Im intending to add a plate on the other side but forgot to show it on the sketch.

Thanks for the guidance guys. It's clear now