Can you explain how engineers can circumvent drastically enlarging pier and pedestal dimensions to meet PROFIS design results? For shear lug design, the new ACI 318-19 and PROFIS software has an extreme sensitivity to edge proximity in comparison to old design method (ACI 349-13 and archived edition of AISC DG-1). Old designs saw a benefit of wide and shallow lugs, all while embedded reasonably close to an edge. New design requires narrower and deeper lugs located far from any edge in order to see any useful capacity. Example: for a post-installed shear lug with 23 kip shear and 56 kip uplift, PROFIS with ACI 318-19 is requiring a pier to be 50 inches x 50 inches to satisfy breakout. In comparison, the old method with ACI 349-13 would require the pier to be 20 inches x 20 inches.
Hi Issac,
For further technical assistance, please send a copy of your PROFIS Engineering design file to Hilti's Engineering Team at hnatechnicalservices@hilti.com.
Regards,
Matthew
My best guess is that pier detailing, specifically ties within ca1 of the top of pier, will now require larger bars and more layers.