For l = 1: I /= 0 F = ((0.50001 + -0.86603*i)*Fy,Fy,0)
For l = 2: I /= 0 F = ((0.50001 + 0.86603*i)*Fy,Fy,0)
For l = 3: I = 0 F = (0,0,Fz)