Behaviour of profiled steel composite beams is studied in this paper. Finite element software LUSAS is used to carry out the non-linear analyses in order to study the ultimate load behaviour of the beams. Experimental results reported by other researchers are used to verify the finite element model. Different shapes, arrangements, and number of steel sheeting ribs have been studied by finite element analyses. Effects of the parameters on the ultimate capacity of the profiled composite beams have been examined. The results are presented in the form of load-deflection plots. It is concluded from the study that the ultimate load capacity of the profiled composite beams is influenced with different shapes, arrangements, and number of ribs and as the number of the ribs is increased the ultimate load capacity of the beams is increased, too.