Transverse beams connected with reinforced concrete slabs might be helpful for structural systems to endure earthquake and to keep the stability after complete failure of the longitudinal beams. To investigate the behavior of the connections between transverse beams and floor slabs, three torsional tests of a transverse beam connected to a concrete slab with studs were performed. It was observed that the behaviors of the connections are different according to the location of the slab and the direction of the torsional rotation. These behaviors were also observed in finite element analyses (FEA), and the load-deformation relationships and crack locations obtained by the FEA agreed with the test results. To predict the ultimate strength, a simple mathematical model were proposed and validated using the FEA and test results. It was shown that this model could predict the bending moment in the slab and the axial force in the studs. This model can be used to estimate the failure mode and the maximum strength of the model by defining the maximum bending moment of the slab and the maximum axial force of the stud.
