Question: The cross section of a rectangular beam having width and height is shown in part (a) of the figure. For reasons unknown to the beam

The cross section of a rectangular beam having width and height is shown in part (a) of the figure. For reasons unknown to the beam designer, it is planned to add structural projections of width b/9 and height to the top and bottom of the beam [see part (b) of the figure].
For what values of is the bending-moment capacity of the beam increased? For what values is it decreased?

-b-

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