ACI specifies that interaction in both X and Y should be considered in the same time. As such when considering Force in X direction, half of the Y direction is added to it and vice versa.
Attached is the sections of the code that highlights the effect of interaction.
Omar,
When it comes to shear in the x- and y-direction, the key thing to consider is which edge is being deemed as the failure surface. In Figure R17.5.2.1c, the figure is showing the interpretation of the code stating that the maximum shear force that can be applied to a parallel edge, with concrete breakout governing, is twice the force when the shear is acting parallel to the edge. In Hilti’s PROFIS Anchor software (https://www.hilti.com/content/hilti/W1/US/en/engineering/software/profis/profis-anchor.html), the software will look at all possible failure edges and provide you with the results on which direction will control the design for shear concrete breakout in the design report. If you have any other questions, please feel free to contact us.
Regards,
Bryan
Omar,
To clarify my earlier comments, a good starting point for the resultant forces will be Section 2.0 of the PROFIS Anchor Design Report, which will show you how the software is calculating the forces; however, it will not specifically have a section shown in the report. A good reference for this would be in the PROFIS Anchor Design Guide in the Factored Load Calculations section (https://submittals.us.hilti.com/PROFISAnchorDesignGuide/#333/z), which will show how the software analyzes tension, shear, and moments in order to find the resultant forces. From this reference you will be able to see the equilibrium relationship calculations that are being used to determine the tension and shear acting on each anchor. After reviewing this reference, if you still have additional questions, please feel free to contact us in our Engineering Support department at hnatechnicalservices@hilti.com for continued assistance.
Regards,
Bryan