I have modeled an anchor bolt connection in PROFIS and I was wondering why PROFIS does not add an additional tension force to the bolts due to the moment couple created by the horizontal force when determining the tension force for the Bond Strength and Concrete Breakout Failure checks? The design I'm working on is a pedestrian bridge with 4 anchor bolts and the base plate sits on top of a bearing pad. This allows a gap between the baseplate and the concrete surface, allowing the base plate to rotate. The column experiences a vertical uplift force and a horizontal force. The horizontal force will cause the base plate to rotate on the bearing pad resulting in a tension force on one side of the base plate (2 anchor bolts). It does not appear that PROFIS adds this additional tension load to the anchor bolt loads and that PROFIS only accounts for the vertical tension on the entire group and not the additional tension due to the moment couple that would cause 2 bolts to have a larger tension force. Can you please explain why this additional tension load is not accounted for?
Thank you,
Aaron
Hi Aaron,
PROFIS Engineering uses the provisions given in the European Technical Approval Guideline (ETAG) titled ETAG 001 Metal Anchors for Use in Concrete Annex C: Design Methods for Anchorages to consider bolt bending as a possible shear failure mode. For additional information regarding how PROFIS Engineering evaluates stand-off failure due to shear loading, please see Section 2.4 of the PROFIS Engineering Design Guide.
If you have further questions, please reach out to hnatechnicalservices@hilti.com.
Regards,
Ashley