Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

is hilti anchor bolts capacity software reliable?

is hilti anchor bolts capacity software reliable?

is hilti anchor bolts capacity software reliable?

Just done a calc of foundation anchor bolts using hilti online software. The hilti bolt capacities (based on combined cone pull out) appear much higher than the Ec code capacity (based on bond stress between anchor an concrete). Is the hilti software reliable?. Been looking at previous discussions on this issue on the forum . Got mixed views. Any advise please?

RE: is hilti anchor bolts capacity software reliable?

I find it to be fairly reliable provided the inputs are correct.

Hilti's tech department is fantastic at helping out. Talk to them, express your concern and see what they have to say about that.

RE: is hilti anchor bolts capacity software reliable?

I agree that Hilti is very helpful, you should be able to address any concerns with them.

A couple of findings from my limited experience:

I have checked their anchor bolt (epoxy and mechanical) capacities to my hand checks using ACI Appendiz D, and there were situations where they were using higher modification factors yielding a higher capacity than what I had calculated. I was able to reconcile this with the fact, that ACI states that other values may be used if certain tests have been completed. Hilti does a very good job of testing their products, and you can contact them if you would like these reports as I did.

As far as how the loads are distributed to the anchor bolts, Hilti assumes a perfectly rigid baseplate. This is fine for most cases, but I have had to deal with some unique/high load cases in which I needed to model my baseplate in FEA in order to determine the loads on the anchor bolts.

RE: is hilti anchor bolts capacity software reliable?

I prefer Simpson, but the recent changes in the considerations of temperature related reductions in allowable stress have made me rethink the problem.

Mike McCann, PE, SE (WA)

RE: is hilti anchor bolts capacity software reliable?

I've found the Hilti software to be very reliable. To be honest, whenever we've found an issue, it's wound up being about our not understanding the inputs and underlying theory well enough. I've used the attached document to aid in my understanding of the Profis methodology. No doubt Hilti has other documents that could address your particular issues.

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: is hilti anchor bolts capacity software reliable?

@jayrod12, I have set up a meet with Hilti to discuss my concerns. It appears that the general consensus is that the Hilti method is reliable provided the inputs are correct. Thats the re assurance I needed. I have also specified a pullout test load on of 3% of the total number just in case. Using proof stress of 1.1 x ULS load, saw that in the anchor bolt guidance. @andriver, It would be good to get a correlation between using the FEA to the assumption of perfectly rigid plate, is it 10%?. I have some workmanship issues with the contractor so would probably allow some generous safety margin anyway.
@msquared48, What is the Simpson?

@KootK thanks for the attached document, does clarify the Hilti elastic theory for anchor bolts, very well explained. I do have a spreadsheet for combined bending and axial force for columns so will tweak the spreadsheet with the hilti approach to see to if I can replicate the Hilti software output.
thank you all!

RE: is hilti anchor bolts capacity software reliable?

Quote (Koot)

it's wound up being about our not understanding the inputs and underlying theory well enough.

I fully agree here. A lot of engineer were badly applying correction factors such as edge factor using table when calculating resistance manually.
The result is when using the software, resistance of often so much lower than (wrongly) expected.

Note that the LRFD transition to anchorage bring lower resistance to some failure mode.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - How ESI is Helping Move New Medical Device Product to Market Quicker & More Cost Effic
Early Supplier Involvement has long been a strategy employed by manufacturers to produce innovative products. Now, it almost seems like a necessity. Because decisions made in the design phase can positively affect product quality and costs, this can help add value to OEM bottom lines. This white paper will discuss many facets of ESI, including why it’s so valuable today, what challenges limit the benefits of ESI, how cost is impacted, and more. Download Now
White Paper - Moving to a Driverless Future
This white paper describes what we see as the best practices to support a sustainable engineering process for autonomous vehicle design. It exposes how to use simulation and testing in common frameworks to enable design exploration, verification and validation for the development of autonomous cars at a system, software and full-vehicle level to drive a mature product development process for automated driving. Download Now
Research Report - How Engineers are Using Remote Access
Remote access enables engineers to work from anywhere provided they have an internet connection. We surveyed our audience of engineers, designers and product managers to learn how they use remote access within their organizations. We wanted to know which industries have adopted remote access, which software they are using, and what features matter most. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close