MT-1620 al.2002 Choose some axis system y, z(convenience says one might usea“ corner of the bean Find the modulus-weighted centroid location A y A (2=sum over number of flanges/stiffeners number (Note: If flanges/stiffeners are made of the same material. remove the asterisks Find the moments of inertia with reference to the coordinate system with origin at the modulus-Weighted centroid =∑4 Paul A Lagace @2001 Unit 15-9MIT - 16.20 Fall, 2002 • Choose some axis system y, z (convenience says one might use a “corner” of the beam) • Find the modulus-weighted centroid location: * ∑A y * i i y = * ∑Ai * ∑A z * i i z = * ∑Ai n ( ∑ = sum over number of flanges/stiffeners) i =1 number = n (Note: If flanges/stiffeners are made of the same material, remove the asterisks) • Find the moments of inertia with reference to the coordinate system with origin at the modulus-weighted centroid * * *2 Iy = ∑Ai zi * * *2 Iz = ∑Ai yi * * * * Iyz = ∑Ai yi zi Paul A. Lagace © 2001 Unit 15 - 9