Unfortunately there is not a single available example of how the capacities are determined, or even a failure mode for more specialized anchors.
The 4:1 safety factor is from OSHA, which doesn't mention combined interaction or ACI Ch. 17. Adopting the most conservative aspects of different...
So when checking it, would you not use the larger safety factor for allowable, or is that “undercooking”? Some catalog purveyors consider the check with the 4:1 for allowable “overcooking”
I'll keep it short...half the hardware vendors and consulting engineers say combined shear and tension should be checked for lifting hardware, other half say it doesn't apply. Sometimes it controls.
Assuming its origin is in ACI Ch. 17, there is a disclaimer in the first paragraph of the...
Every precast lifting anchor catalog has the option of using 2.66:1 safety factor in lieu of the typical 4:1 for precast. OSHA lists 4:1 for precast, other than tilt-up.
Does anybody have insight on when its acceptable to use 2.66:1 for plant-built precast insulated wall panel lifting anchors...
