Experimental Research On Mechanical Behaviors Of Multiple-row PBH Shear Connectors In Steel Box-concret Composite Members

Steel box-concrete composite members are recently developed as a new type of steel-concrete compo sitestructure.Shear connector is the key factor in steel and concrete's mutual work,the performance of shear connector would determine whether steel and concrete could fully work together.Research indicates that PBH shear connector is the proper choice for steel box-concrete composite members' connector.Due to the shear connectors' load unevenly distributed in multiple-row PBHshear connectors is hard to ignore,recent research on single-row working performance and capacity limit can't meet the practical needs.The deep research on multiple-row PBHshear connectors' working performance and capacity limit are needed to be done.In this case,this dissertation is trying to reveal the mechanical behaviors in multiple-row PBHshear connectors by both experimental and computational methods.Main contents and conclusions are as follows:?Multiple-row PBH shear connectors' pushing experiment indicates:set multiple-row PBH shear connectors' row number and distance between as controlling parameters,the pushing experiment was set up in 3 groups and 8 samples in each.Base on the results,thefailure patterns of multiple-row PBH shear connectors' could be described and concluded.?The research on multiple-row PBH shear connectors' Load-Slip curve:based on the multiple-row PBH shear connectors' Load-Slip curve,each working stage of PBH shear connectors could be conclude and the effect of row numbers and interface bond length on the entirely mechanical behaviors could be analyzed.? Multiple-row PBH shear connectors'capacity limit research:based on the results of experiment and the effect of the controlling parameters,the multiple-row PBH shear connectors'elastic stiffness,elastic capacity and capacity limits had been researched alone with the calculation method of bearing capacity of the multiple-row PBH shear connectorson the basics of single-row PBH shear connectors.?The regularities of distribution of multiple-row PBH shear connectors' sliding alone the shear direction research:based on the Load-Slip curve from the experiments,the regularities of distribution of the multiple-row PBH shear connectors' sliding alone the shear direction under different loading stages was analyzed,and the load unevenly distributed in PBH was researched.?The computational methods research on multiple-row PBH shear connectors:considering about the resultspreciseness and calculation efficiency,the parameter of proper interface connection and concrete's damage constitutive model,established a multiple-row PBH shear connectors' finite element model which could simulate the loading process of experiment.?Multiple-row PBH shear connectors'finite element analysis:based on the simulation data,study on the PBH shear connectors' interface effect,concrete damage and variation stresses of steel,searching the variation of location,materials and members effect on mechanical behavior of the PBH.?Multiple-row PBH shear connector members mechanical behaviors research:on the basis of experiments and data simulations,the interface effect of steel-concrete,concrete damage process and the stress on steel had been analyzed,the research on multiple-row PBH shear connector members mechanical behaviors had been done.