Ask HiltiAskLearnArticles
Ask Hilti

Will you update Profis to calculate Shear Breakout according to ACI 318-14 Figure 17.5.2.1b? The current approach is too conservative.

Posted by Dustin Atwoodover 6 years ago
Will you update Profis to calculate Shear Breakout according to ACI 318-14 Figure 17.5.2.1b? The current approach is too conservative.

When performing Concrete Breakout – Shear checks on anchor groups with 2 or more rows of anchors parallel to the direction of the shear load and no slots in the base plate, Profis applies the full Vua to the leading row of anchors.
 
The program should follow the recommendations shown on the right side of ACI 318-14 Figure 17.5.2.1b [ACI 318-11 Figure RD.6.2.1(b)]. ACI 318-14 17.5.2.1 commentary recommends that the full Vua be applied to the leading row of anchors only when the spacing between anchors (s) in the direction of the shear load, is less than the edge distance of the leading anchor from the edge perpendicular to the shear load (Ca1,1). Otherwise, ACI 318-14 17.5.2.1 commentary recommends that Vua / 2 be applied to the leading row of anchors and Vua be applied to the back row of anchors and that both checks be performed. Note that if the plate washers are welded to the base plate, only Cases 1 & 2 need to be considered regardless of anchor spacing or edge distance.

Profis,shear concrete breakout

2 Replies
Posted by Axelover 6 years ago

Dustin
Thank you for the feedback, I will pass this along to our team developping the software. We understand you want improvement into our Anchoring software solutions. We are working on what we need to improve in our next versions and we are going to take these into consideration.
Would you be willing to participate in a short call with our anchoring experts, we would like to discuss your points.
They would love to go deeper and understand how we can get better.
If yes, please, answer me through direct message, and I'll make sure they get in touch you.

Regards
Axel


Posted by  Oscar E Henriquezover 3 years ago

Any update on this question?


1 comment on this reply
Posted by Dustin Atwoodover 3 years ago
Oscar, I haven’t used Profis in a while but I don’t think this issue has been fixed. Hilti’s position was that their analysis is conservative so we’re not going to change it. If you cannot use the conservative result I suggest you run two designs: one with the leading edge baseplate holes slotted and the full shear applied and one with half the shear applied and unslotted holes to check the anchorage according to ACI 318 standards.