Simplify combined loading case? 1

[zonaguy920]

What's the best way to go about determining shear and tensile loads in two bolts of diameter D that fix the two segments together -- where I have known forces and moments acting in the X, Y and Z planes (all with different magnitudes). Is there a way to simplify this? Thanks

 

[MotorCity]

Resolve the moments into coupling forces then design the bolts for the resulting shear and tension forces using an interaction equation.

 

[zonaguy920]

Thank you motorcity. So Mz will create a force couple in tension (Mz/a), Mx will create a force couple in shear (Mx/a), and My will result in a 0 force couple. Does this sound correct?

 

[MotorCity]

That is correct, except My may create flexure of your bolts depending on the arrangement and how My is applied

 

[BMart006]

Right, I would be cautious about the effect My has on your bolts. Having a third bolt (or forth, for symmetry) off of the y-axis would greatly increase your resistance to that moment. You'll also need to consider the forces themselves in addition to the moments. I'd recommend using AISC J3-3(a) or (b) for calculating the combined loading case.