Abstract
In the paper, to assess the ultimate resistance of a simply supported composite beam, a three-dimensional beam element was used to model discrete stud shear connectors, and the studs were assumed to connect the middle plane of the concrete slab and the top steel flange of the steel beam both were modeled by shell element. This should be crucial in the finite-element study and raise a question how the shear connection stiffness in the analysis model was derived, which should not be the stiffness in real beam or that simply from push-out test. Accordingly, the full shear connection for a composite beam is known as being sufficient shear strength provided by the shear connectors in the critical shear span at the interface between the concrete slab and the steel beam to enable full plastic strength in the steel beam section. Let Pst be the design shear resistance of each stud; n be the available number of studs in the critical shear span; nf be the number of shear studs capable of being a full shear connection composite beam; and Fu be the ultimate longitudinal force resisted by the shear connectors. The required number of shear connectors within the critical shear span to enable full shear connection is determined as
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