Now for prying, the real problem is trying to (accurately enough!) predict the LOCATION of bending line of the anchor plate under the actual ultimate moment load the direction of the ultimate bending moment load the actual amount of the bending moment the resistance of the anchor plate to bending about that (unknown and only guessed at) bending (line) location and the strenght of the concrete, concrete-to-bolt, and bolt+nut strength that are resisting the (unknown but guessed at) bending moment at the (unknown but guessed at) bending line location. That's not really a bad thing - considering that their equations are going to holding up things above people's heads and property.īut think about this particular shear prediction: Shear is rarely the limiting issue in concrete anchors Prying is the limiting value (pulling the anchor out of the surface of the concrete, rather than cutting the anchor bolt in half due to shear loads.) So, since shear isn't a limit, why not check the connection array for shear conservatively?
OK, so Hilti is 'conservative' when trying to predict (not calculate) shear in their anchor bolts.
