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The moment capacity of composite slim floor beams is dependent on the area of concrete in compression and on the degree of shear connection between the concrete and steel beam. The effective breadth of the slab, Be, is taken as beam span/4, as for a normal composite beam.(2,5,6)

Full shear connection. Figure 6 shows a typical cross-section through a composite beam. Also shown is the plastic stress distribution across the section. Full shear connection occurs where the number of shear connectors provided is sufficient so that the force they transfer is greater than the resistance of the concrete or steel member. This will generate the maximum moment capacity of the cross-section. In the majority of cases, the concrete resistance R<. is less than the resistance of the steel member, ie.