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Shallow cellular Composite Floor Beam is a new type of composite floor beam that usually consists of a structural steel beam with regularly spaced web openings and concrete slab casted above the steel decking. In this study, the shear transferring mechanisms of shallow cellular composite beams design with innovative shear connection systems are investigated. A detailed finite element analysis program was performed to investigate the force transferring mechanism, load bearing capacity and failure behavior of the shear connections under direct longitudinal shear forces by simulating the push-out tests. Four different configurations of shear connections (web opening configurations) were designed and an intensive parametric study was conducted to determine the material and geometric parameters that likely influence the behavior of the shear connection. Finally, the findings from this investigation are incorporated with the bending and push-out test results to develop design methods for this form of shear connection. The failure mechanisms of the shear connection were confirmed, and it was also revealed that this type of shear connection is effectively © 2014. This manuscript version is made available under the Elsevier user license http://www.elsevier.com/open-access/userlicense/1.0/ 2 capable to provide the desired shear resistance and ductile behavior if designed properly.

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The behavior of shallow cellular composite floor beam is normally governed by the shear transfer mechanism at the contact interface between the concrete slab and the encased steel beam, thus by the influence of the two materials. A detailed finite element modeling approach in investigating the structural behavior of shallow cellular composite floor beam is presented. The shear bound at the contact interface between the concrete slab and the steel beam is simulated by using the contact modeling and considering the adhesion, the friction and the local compression at all the contact zones. Both the material and geometric nonlinearities are considered in the FE modeling of the shallow cellular composite beams. The FEA results are calibrated and validated against the test results and the comparisons indicated that the FE analysis procedures with the contact modeling agree well with the test results, and can accurately predict the flexural behavior and the load bearing capacity of the composite slim floor beam. An extensive parametric study is further conducted to investigate all

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