When selecting a grouted base plate, Profis analyzes the anchor rods per Eurocode, looking at bending in the anchor rods when this isn't necessarily required by ACI 318 or even AISC depending on hole size, and whether welded washers are used. As others have mentioned, this causes the design to appear to be highly overstressed when it isn't in reality per ACI 318 (or AISC DG1 for that matter). By selecting ACI 318-19 as our design method, the program should be considering the shear reduction
factor for grouted connections. The program should not be checking the anchor rods with Eurocode when we are selecting ACI 318-19 as the design code. It would be beneficial to include a check for using welded plate washers or oversized holes in the base plate which impact bending of the anchor rods per AISC DG1 which would be more applicable to ACI 318-19 than Eurocode is. It would be nice to have an option of whether to consider anchor rod bending or not and also whether to analyze anchor rod bending per AISC DG1 or Eurocode. Are there any plans to make changes like this?
Hi Andrew,
PROFIS Engineering utilizes the Guideline for European Technical Approval (ETAG 001) provisions to evaluate bolt bending when a stand-off condition is being modeled for shear load conditions. The reason PROFIS Engineering includes this design check is that ACI 318 anchoring-to-concrete provisions do not address the possibility of bolt bending in detail; particularly when the stand-off is not grouted. Therefore, the software calculations consider bolt bending resulting from a stand-off condition as a possible failure mode in shear because it could be the controlling failure mode when stand-off exists. More information may be found on page 307 of the PROFIS Engineering Design Guide.
Current development plans for the software are unknown, but this feedback will be passed along to Hilti's software team for future consideration.
Regards,
Matthew