Structural Performance Evaluation of Composite Beams With Different Shear Transfer Mechanisms at Beam-Slab Interface

In general, a steel beam is connected to a concrete slab using shear connectors, forming a composite beam. This composite action shifts the neutral axis under bending, resulting in a buckling behavior that differs from that of a bare steel beam. Moreover, the structural performance of composite beams is significantly influenced by the stress transfer mechanism facilitated by the shear connectors. However, the impact of shear connector and slab properties on buckling behavior has not been fully explored. To address this gap, this research first proposes a simplified method. For modeling composite beams that accurately reflects the behavior of shear connectors. Additionally, a comprehensive parametric study is conducted using an experimentally validated finite element analysis (FEA) model, exploring the influence of various shear connectors and slab properties. Based on the analytical results, a modified evaluation index and equation are ultimately proposed to enhance the assessment of composite beam performance.