fully threaded anchor bolt and unthreaded or not fully threaded anchor bolt

[ABA102]

Hi,

We have a situation on our project involved with steel structure. The Contractor used a not fully threaded anchor bolts with threads at the ends to anchor the base plates of the steel structure only instead a fully threaded as specified by the design.
Is there a big difference or any impact on the structural design calculation of anchor bolts for such changes in the actual?

 

[KootK]

I'd want the physical reality to match my design assumptions which would mean one of two things:

1) If I did a classic ACI Appendix D calc assuming that the anchor bolts were "anchored" at the head at the bottom, then I'd consider the substitution to actually be an improvement as bond along the length of the bolt was not really accounted for in the design.

2) If I were using something like Dywidag/Williams thread bar, then I might be assuming the deformation on those rods to be acting as bond along the length of those rods. In this case. I'd consider the substitution a problem.

#1 is a much more common scenario for me.

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.

 

[ABA102]

Hi KootK,

Please see the attachment such anchor bolts are being used. Which corresponds to no.1 of your statement.
The square plate is being at the bottom embedded in grout and the round plate will be on the top of the base plate.

 

[dik]

Non-compliant or otherwise, unless you have very high strength anchor rods, they appear to be sufficiently strong. You might want to have the contractor have an engineer to certify them I normally don't use a plate like that unless there is a shallow embedment issue.

Dik

 

[KootK]

Which corresponds to no.1 of your statement.

Then I'd consider the substitution an improvement, at least in terms of structural performance. Overall contract administration processes may need review.

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.

 

[dik]

KootK... concurr... I'd be concerned that the plates are so large that they might initiate a horizontal crack...

Dik