Push-out Tests On Stud Shear Connector Of Prefabricated Steel-concrete Composite Beams

The steel-concrete composite structures are widely used in high-rise buildings,large-span structure,towering structure and bridge structure,with the advantages of good bearing capacity,light weight,good ductility,and environment-friendly.The prefabricated composite beams which have factory prefabrication,in-situ assembly,quick construction,high quality,short construction period and environmental protection advantages will be suitable for modern structure's "lightweight large-span,prefabrication" demands and satisfy the requirement of the new industrialization prefabricated building system related requirements.Considering about this,experimental study on stud shear connector of prefabricated steel-concrete composite beams with small reserved holes in the concrete slab which filled with early high strength and non-shrinkage material will be studied in this paper,the main work is as follows:(1)Twenty-four composite beam push-out tests which including six in-situ casted concrete slabs and eighteen prefabricated concrete slabs were designed according to EC4.The experimental parameters include stud diameter,different aperture,different aperture ratio and construction error.(2)According to twenty-four push-out test results,the influence of stud diameter,aperture ratio and construction error on the load-slip,shear bearing capacity and limit slip and shear stiffness were studied.Compared with the different codes,the design proposal for stud shear connector of prefabricated steel-concrete composite beams was put forward.(3)Using the nonlinear FEA software ABAQUS established the push-out test models,the influence of stud diameter and aperture ratio on the stud's shear capacity failure behavior,and load-slip were analysed.The simulation results were in good agreement with test results.