Can the shear capacity of a concrete screw be relied upon when driven through a timber base plate of say 45mm plus, or does the bending effect on the concrete screw determine capacity rather?
Hi Drew,
Thank you for reaching out to Hilti.
Unfortunately, there is no solution within the scope of AS5216, or even EN 1992-4, for this application as the anchoring standards don’t cover intermediate layer made from timber.
However, the following approach can be considered:
• The design can be considered with stand-off in static loading only if design according to EC2-4, with the minimum strength of grouting of 20N/mm2 (assume timber as stand-off in grouting). The verification of bending resistance and the steel shear resistance can be done accordingly in the shear load with lever arm mode of failure.
If you have any further questions, please reach out to our engineering team >> here.
Hope this helps.
Kind Regards,
Ask Hilti Team