3. PROFIS ENGINEERING FUNCTIONALITY
Within the Hilti PROFIS Engineering software concrete fixing module, stand-off functionality (2) can be found in the base plate tab (1), as shown in Fig. 10. When stand-off without clamping or clamping can be selected (3), the default restraint level is assumed to be:
• 𝛼𝑀 = 1 when standoff without clamping is selected
• 𝛼𝑀 = 2 when standoff with clamping is selected
The user can modify this value (4).

Figure 10. Clamping and restraint options in PROFIS Engineering.
Within the loads tab (1) there are several options for design, and by default the standoff is verified to EN 1992-4 ((2), Fig. 11).
To proceed with the SOFA standoff design method, select this from the standoff section (3).

Figure 11. Choice of design method in PROFIS Engineering.
4. DESIGN EXAMPLE
Problem statement:
1. Verify the steel resistance of the anchors in the stand-off base plate connection below for both EN 1992-4 design and for Hilti SOFA Method design, where it has been verified that the conditions for 𝛼𝑀 = 2.0 from Sec. 2.2.1 have been met.
2. Determine the value of the multiplication factor 𝜓𝑏,𝑢 to be applied to shear concrete edge breakout resistance.


Figure 12. Design example parameters.




Note that for EN 1992-4 design, 𝛽𝑁,𝑉 is equivalent to 𝛽𝑉 , as the interaction of tensile and shear forces is incorporated directly into the calculation of 𝑉𝑅𝑑,𝑠,𝑀.




*The combined tensile and shear utilization for EN 1992-4 is incorporated directly into the equation for shear resistance in EN 1992-4 Eq. (7.37). Therefore, the shear utilizations and the combined utilizations are identical.

Calculation of multiplier 𝝍𝒃,𝒖
The multiplier 𝜓𝑏,𝑔 is automatically applied to the shear breakout failure mode in the Hilti SOFA Method design.

The shear breakout resistance will be multiplied by 0.76 in SOFA design.


5. REFERENCES
[1] EN 1992-4 (2018). Eurocode 2 – Design of concrete structures - Part 4: Design of fastenings for use in concrete .
[2] fib (2011). Bulletin 58 – Design of anchorages in concrete: Guide to good practice .
[3] McBride, K. (2014). Steel strength of anchor bolts in stand-off base plate connections . Ph.D. Dissertation, University of Florida, Gainesville, FL, USA.
[4] Scheer, J., Peil, U., and Nölle, P. (1987). Anchors under planned bending (in German) . Institut für Stahlbau, Braunschweig, DE.

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