Double Angle Bending 1

[ag89]

I am trying to calculate the allowable stress for double angle beams used to support utility piping. The "stem" of the double angle is turned up, i.e. the stem is in flexural compression. I have some literature on wt shapes in this configuration, seems like a lot of derivations just to arrive at 0.6Fy for the allowable stress. Just wanted to know if anyone had come across this and how to arrive at the allowable stress relating to lateral torsional buckling.

 

[ishvaaag]

You have at the Mathcad Collaboratory site for free download worksheets that perform the calculation you intend. You have the evaluation in LRFD chapter F worksheet (and of course the indications in such chapter in the code). Other sheets also give the axial and biaxial checks for angles and single angles.