If “Ib” is the moment of the inertia of the rolled beam section, “Ap” is the area of the cover plates in one flange and “h” is the distance between the centroid of the top and bottom flange plates, Moment of inertia of Built-up plate girder is given by:
1
\(I = \left[ {{I_b} + 2{A_p}{{\left( {\frac{h}{2}} \right)}^2}} \right]\)
2
\(I = \left[ {{I_b} + 2{A_p}{{\left( {\frac{h}{2}} \right)}^3}} \right]\)
3
\(I = \left[ {{I_b} + 2{A_p}\left( {\frac{h}{2}} \right)} \right]\)
4
\(I = \left[ {{I_b} + 3{A_p}{{\left( {\frac{h}{2}} \right)}^2}} \right]\)