What is the correct method to determine the moment of inertia of a symmetrical Tsection about its centroidal axis?
1
Consider only the moment of inertia of the flange, as it dominates the shape
2
Assume it behaves as a solid rectangular section of the same overall dimensions
3
Use the perpendicular axis theorem directly
4
Use the parallel axis theorem to sum the moments of inertia of the flange and web