Reliability analysis and evaluation of resistance factor for composite beams with deconstructable shear connectors

The combination of precast concrete slabs and steel beams connected by deconstructable high-strength friction-grip bolts has emerged as a promising solution for sustainable construction. However, the lack of design guidelines and r egulations has restricted its widespread use. This study aims to conduct a reliability analysis to evaluate the flexural resistance factor (Φ) for composite beams with HSFGB shear connectors, as the AISC Specifications incorporate the shear connector resistance factor as part of the overall resistance factor of the composite beam. To analyze the behavior of the composite beam, a three-dimensional finite element model was developed and validated. Additionally, a sensitivity analysis was performed to investigate the impact of various parameters on the flexural strength of the composite beam. The flexural resistance factor for this type of composite beam with varying degrees of connection was evaluated providing an acceptable level of safety. The variability and uncertainty in connectors were determined based on existing push-out tests using statistical analysis. A reliability study found that the reduction factor of flexural resistance for this type of composite beam is dependent on the degree of shear connection. Additionally, using the flexural resistance factor recommended for conventional composite beams with welded shear connectors in the AISC code is unconservative for deconstructable composite beams.