Okay, attached is a page from the text book I used. It has the table to determine beta based on b/d. I also attached my calc of the cruciform section as an example for you. Note that 'b' is the long side of rectangle and 'd' is the shorter side regardless of it's orientation, unlike when...
Thank you everyone for your help. I've actually figured it out. In my research I've discovered that to determine the Shear Stress in the column it's much easier, and more accurate, to use Torsional Resistance, R, rather than the torsional constant, J.
shear stress = Tc/R ...look similar to...
Okay, so bt^3/3... Does this look right to you? See attachment...http://files.engineering.com/getfile.aspx?folder=ccaba667-d159-4203-b832-863496426f97&file=Book3.xlsx
I've got a cruciform shaped column; a W27x84 crossed by a W14x53. I'm trying to check torsion, but am unsure how to determine the torsional constant, J. Do I simply add the two together? Any guidance on what to do would be much appreciated. Thanks!
