Below the Hook Code 2020 2

[anthony gravagne]

In the design of lifting lugs in accordance with the ASME BTH-1 standard, there are three basic equations listed which define the allowable tension strength though the pin hole, and two more equations for strength beyond the pinhole. One of the variables in equation 3-51 is the letter "a" which the distance measured from the edge of pinhole to the edge of the plate in the direction of the applied load. The BTH code places no restrictions on the minimum value of "a". But the AISC Code does. Does anyone know why this is? Clearly the variable "a" must have a limitation but the BTH code is silent about this.

 

[canwesteng]

Are you comparing minimum edge distances for bolts to lifting lugs? I'd certainly always leave some meat on the lug, but since ASME consider splitting of the material I'm not sure a minimum is required.

 

[WinelandV]

Just chatted with my buddy who used to be active on the BTH committee. He said it appears that the AISC dimensional requirement for "a" is there to preclude the single plane fracture failure (splitting). BTH-1 checks it directly, so no required minimum.

LPS to canwesteng for deducing the reason so quickly.

Please note that is a "v" (as in Violin) not a "y".