Capacity of 'J' or 'L' Type Anchor Bolts 4

[dik]

Does anyone have a simple spreadsheet that calculates the capacity of these anchor bolts in accordance with ACI? I can work it out... just looking for a quick solution and hope someone has done this work. The input data would be the concrete strength, the grade of steel, bolt diameter, embedment length and the length of the hook. Edge distance is optional.

Thanks in advance...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik

 

[r13]

I think the code required embedment length for hooked bars should be the minimum.

 

[dik]

Quick and dirty project... the original spec for the canopy was for 4 'J' bolts... one set was mis-located and the contractor cut them off, without asking, and relocated the canopy support anchors and installed 4 3/4" wedge anchors as a remedy... I need to show the 4 wedge anchors,if installed correctly, are better than the original 4 'J' bolts... need a quick solution... they're hanging on site.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik

 

[JedClampett]

Have you got access to DeWalt or Simpson or Hilti anchor analysis tools? It's all spacing and edge distance. If they're 8D from an edge and spaced at 8D, they're likely OK.

 

[STrctPono]

The only difference between headed anchors and "L" or "J" anchors is in their pullout capacity.

My understanding is that concrete pryout, breakout strength in shear, breakout strength in tension, and steel strength would be the same as it would be for a cast-in headed anchor bolt.

My suggestion would be to download HILTI Profis anchor and run a quick check on a cast-in headed bolt and then manually calculate the pullout strength per ACI 318-14 17.4.3.5

 

[jayrod12]

dik,

simspon anchor designer will do cast-in bolts like J and L for free. Hilti, in Canada, you need to have premium to run the cast-in anchors.

 

[r13]

Jed's suggestion is better, just check what you need, and what you have. I don't think ACI encourages the use of hooked bars as structural anchorage.

 

[dik]

I can easily determine the capacity of the wedge anchor... They are DeWalts. I simply want to show that this capacity is greater than the 'J Bolts' that were originally spec'd... and hope the EOR accepts this. I haven't used 'J Bolts' for likely more than 30 years... I'm aware the ACI doesn't recommend them. None of the anchor programs address 'J Bolts' that I'm aware of.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik

 

[jayrod12]

I'm fairly certain that the simpson program does address j-bolts. At least it did the last time I used it.

 

[dik]

Thanks jayrod12... I'll take a peek...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik

 

[canwesteng]

HILTI does cast in for free in Canada too (on the web app). Not sure about J bolts though

 

[BAretired]

Why not use this?
EDIT: This is from ACI 318-14.

BA

 

[r13]

Is it in ACI?

 

[BAretired]

Yes, you can download ACI 318-14. It is in there.

BA

 

[BAretired]

Table 1 below shows pullout values found by Kuhn and Shaikh in 1996 tests.

BA

 

[dik]

Thanks BART...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik

 

[dik]

in CSA, but ACI will be close... just have to show that one is better than the other and with either code there will be a big difference considering 7-1/2" embedment for the wedge anchor... will stipulate that resistance is ACI, but CSA will be similar.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik

 

[Canuck65]

If you can justify CSA is going to be close to ACI, why not just look in the tables towards the end of Chapter 12 (Anchorage) of the A23.3 Concrete Design Handbook, Table 12.5? Lots of tabulated values for headed, J or L hooks.

 

[dik]

Thanks Canuck... didn't know about that.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik

 

[jayrod12]

Thanks Canuck, didn't know that either.

However, in the newest version of the book they don't include table 12.5 directly. It is in an additional design aids package that you must download, for free, from cement.ca. Just a note to all.