| Due to its advantages of large column grid,large space,and high space utilization which have been accepted by people,the composite structure system with frame and slab column has been widely applied to engineering practice since it appeared.However,in most cases,the weight of floor accounts for about 60% ~ 80% of the total weight because of the large span column grid in the slab-column structure system.The floor is borne mainly by the column because of the exsistence of no beam.The bigger gravity causes serious load in the link of slab-column,the weakness of nodes and the reduce of the whole building safety reliability,which restrict the development of the slab-column structure system in a certain extent.For hundreds of years, many domestic and overseas scholars conduct amounts of experimental study and theoretical analysis and achieved many satisfactory results.In this paper,on the basis of previous studies,to reduce the weight of floor and enhance the intensity of nodes as a starting point,dedicated to the development of light quality,high strength,good applicability to the new connection,for which conduct six cast-in-place hollow floor slab-column reinforced connection test.This is a new kind of slab-column structure prepared by buried core pore forming technology with the shear enhanced,which not only solve the biger gravity,connection key problems such as weak,but also have a good sound insulation,heat insulation effect.In this paper,based on the local solid foundation of the core area of the connection,the paper mainly studies the two kinds of punching shear components of the steel bar and the section steel cross bridging,and the analysis data such as the load-deflection curves,loadstrain curves and fracture distribution rule,the ductility of specimens and related mechanical properties,and compare and analyze the differences of punching and cutting characteristics of two types of 120 mm and plate thickness 140 mm whose results are satisfactory.The whole process of the stress of all specimens was calculated by the numerical analysis software ABAQUS and through analysis nephogram,load displacement curve of numerical,the numerical results are in good agreement with the experimental results,and at the same time,on the basis of numerical simulation we can distinguish the failure form of specimens.Therefore,the paper set up finite element model by changing the parameters to study the influence of these factors such as bending of reinforced area,concealed beams,concealed beam stirrup spacing,slab reinforcement ratio,steel shear frame arm long on enhancing the punching characteristic of the node and deeply understand the effect factors of enhancing nodes.On the basis of experimental study and numerical analysis, the ultimate bearing capacity of the test is calculated by the existing standard norm requirement.And many experimental datas are used to analyze the ultimate bearing capacity calculation formula,which are suitable to the slab-column reinforced connection. Compare and analyze the specification of China,the United States, Europe,Japan,Canada on the difference in punching shear bearing capacity calculation,it is recommended in China from Japan and Europe in slab-column structure design should consider the influence of reinforcement ratio. |
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