FIELD OF THE INVENTION The present invention relates to prefabricated steel and concrete composite beams arranged to work with concrete as load-bearing mate structures for various slab assemblies, and two web portions and flange portions extending outwardly of the web portions. (2) is provided, the web parts being positioned side by side spaced apart from each other and connected to each other at one edge of each web part (1) by a horizontal top part (3) and the web part (1) and a horizontal top part (3) is arranged to define a space that can be filled with concrete (4) and in order to improve the characteristics of the beam, at least one plate-like member (5) is provided with the web portion (1) and the horizontal top portion (3). Disposed vertically in a space defined therebetween, the plate-like member being provided with openings 6 which are positioned apart from each other in the longitudinal direction of the beam in series, and the To the lower surface of the end portion 3 be attached to the top edge of the plate member.
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