*Posted on behalf of a Hilti customer.
Hi Customer,
well this is a good question. A torsion moment or an eccentric shear force can create an unequal force distribution on the anchors that are in shear. When considering concrete breakout failure in shear, a resultant force acting towards the fixed edge being considered permits a check to be made versus the calculated concrete breakout capacity of the anchorage.
The resultant shear force includes the effects of the torsion moment on each anchor as well as any direct shear forces acting on each anchor. These calculated forces acting on each anchor are shown in Part 2 of the PROFIS Anchor report. PROFIS Anchor assumes the resultant shear force acts towards the nearest fixed edge.
The resultant shear force may be eccentric with respect to the centroid of the anchors that are in shear. PROFIS Anchor calculates this shear eccentricity and shows the result as the parameter ecV in Part 4.3 of the report. ecV is used to calculate the ACI 318 modification factor for eccentric shear load (ψecV). PROFIS Anchor shows the calculated value for ψecV in Part 4.3 of the report.
Please feel free to reach out any time, if you need additional information.
Best Regards
Jorge