why breadth of beam is shorter than (or equal to )its depth?

Answer Posted / touseef mirza.nita

To resist a given bending moment and also to keep deflections
small, it has been stated that the deepest beam is the most
suitable. If, however, the depth is made too great in
proportion to the breadth, the beam may buckle sideways due to
a column effect as the result of compressive stresses in the
top fibres.

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