Multi-scale study on shear bearing capacity and transmission mechanism of per-fobond-rib shear connector based on large diameter holes and high strength concrete

This study investigated the shear bearing capacity and transmission mechanism of per⁃fobond‐rib shear connector (TPBL). This paper aims to explore the mechanical behavior of different types of connectors under shear force, and to combine experimental tests with theoretical analysis to evaluate their shear bearing capacity. We designed and implemented a series of push out tests, which, through detailed analysis of the experimental phenomena and results, revealed the stress state of the TPBL connector and its mechanical properties with the TPBL shear bond. The research findings are helpful to understand the strain distribution, deformation mode, failure mechanism and force transfer mechanism of the connectors during the shear process. The results prove that the failure mode of the specimens involved in this paper is concrete shear failure, and the H-type steel has great instability deformation, and the longitudinal reinforcement yields but does not break. The destruction process shows good ductility characteristics. In addition, based on the existing research results, the advantages and disadvantages of the bearing capacity model of the existing bearing capacity are relatively analyzed. We deeply analyzed the main problems affecting the calculation model of shear bearing capacity of TPBL connectors and a new bearing capacity calculation equation considering the concrete constraint effect at the bottom of the perforated plate is proposed, this study is of great value in improving the safety of the structure.