In steel-concrete composite slim beams,steel sections are encased in the concrete slab, with the advantages of minimizing floor depths, fast erection, efficient fire resistance and good serviceability,etc. This new type of composite floor has been widely used in some European countries. In China,there also have been some buildings constructed that adopt similar composite slim beams these years. Many research results have been published on the structural behavior of simply-supported slim beams. Actually, the slim beams can also be used as frame beams in multistory buildings. Under vertical loads,the moment at the end of these beams is negative and under horizontal load,the sign of the moment depends on the characteristics of the negative region of the cross-section. The structural behavior of composite slim beam is the basis of the structure design. In this paper, the behavior of cantilever composite slim beams will be investigated by FEA. The analysis has been done to show the influence of the floor slab depth, the ratio of reinforcement and the steel beam to loading capacity.
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