whereL length of member between work points at truss chord centerlines, in. (mm) Lc effective length of the member for buckling about the minor axis, in. (mm) bl length of longer leg of angle, in. (mm)bs length of shorter leg of angle, in. (mm)ra radius of gyration about the geometric axis parallel to the connected leg, in. (mm)rz radius of gyration about the minor principal axis, in. (mm)