The salient(turn)point in regard to serviceability and strength needs to take into account that composite beams in hogging bending behave completely differently than beams subjected to sagging bending. In hogging bending the concrete slab is subjected to tension,and this will significantly affect both the stiffness and strength of the cross sections in hogging moment regions.• The salient (turn) point in regard to serviceability and strength needs to take into account that composite beams in hogging bending behave completely differently than beams subjected to sagging bending. • In hogging bending the concrete slab is subjected to tension, and this will significantly affect both the stiffness and strength of the cross sections in hogging moment regions