HILTI Profis Anchor software - design resistance of anchors
HILTI Profis Anchor software - design resistance of anchors
(OP)
Hello!
I did just a trial calculation in Hilti Profis Anchor software.
I used only one anchor HST-M10 and loaded it with both max. resistance tensile NRd = 6 kN and shear VRd = 18.8 kN load (values are for cracked concrete).
See screenshot.
Utilization is:
Tension: 100%
Shear: 100%
-> both make sense, but...
Tension/Shear Combination is 167%
Does it mean that HST-M10 cannot withstand max. shear and tensile loads if they are applied at the same time?
Thanks for the help!
Edd
I did just a trial calculation in Hilti Profis Anchor software.
I used only one anchor HST-M10 and loaded it with both max. resistance tensile NRd = 6 kN and shear VRd = 18.8 kN load (values are for cracked concrete).
See screenshot.
Utilization is:
Tension: 100%
Shear: 100%
-> both make sense, but...
Tension/Shear Combination is 167%
Does it mean that HST-M10 cannot withstand max. shear and tensile loads if they are applied at the same time?
Thanks for the help!
Edd






RE: HILTI Profis Anchor software - design resistance of anchors
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: HILTI Profis Anchor software - design resistance of anchors
It's explained on page 43 of "Hilti fastening technology manual".
RE: HILTI Profis Anchor software - design resistance of anchors
RE: HILTI Profis Anchor software - design resistance of anchors
RE: HILTI Profis Anchor software - design resistance of anchors
RE: HILTI Profis Anchor software - design resistance of anchors
I believe in the updated hilti technical guide it is now (V/Vr)^5/3+(T/Tr)^5/3 < 1. At least for a couple of the adhesives that I spot checked.
RE: HILTI Profis Anchor software - design resistance of anchors
Think about the old mechanics 'addition of forces" that showed the maximum final force is at the 45 deg angle to the member. It would be interesting to see what an actual test looks like, rather than a screen shot of the program page.
RE: HILTI Profis Anchor software - design resistance of anchors
Very good point. ACI 318-11 Appendix D says to use the linear interaction, but the commentary says the parabolic interaction can be used (Hilti uses parabolic for adhesive anchors; I'm not sure about cast in place or post installed wedge/screw anchors off the top of my head. I only included the linear part in my post to show the OP where the 167% utilization came from.
RE: HILTI Profis Anchor software - design resistance of anchors
RE: HILTI Profis Anchor software - design resistance of anchors
When would you consider the uncracked condition?
I've only determined 2 situations where I would be willing to consider uncracked. The first is an anchor installed into freshly cured concrete in which the anchor will only be used during construction but will not be loaded permanently for the life of the structure. The second is when installed into a compression only member where cracking is unlikely to ever occur due to the confinement provided by the axial load.
RE: HILTI Profis Anchor software - design resistance of anchors