| At present,a large number of columns used in high-rise and super-high-rise building construction projects are basically concrete filled steel tube composite columns,which ensure greater stability,seismic resistance and economical efficiency of the buildings as a whole.In addition to the characteristics of these basic steel-concrete structures,the durability and fire resistance of concrete-filled steel tubular composite columns are greatly improved compared with steel columns;and the overall toughness of the structure has been improved.At the same time,the section size of the components can be reduced appropriately.This structure measure can greatly improve the seismic performance of the earthquake-prone areas.They are all frame structures.The key of force transmission of frame structures is the joints of beam-column connection.The stability and bearing capacity of the joints often determine the normal use of the whole structure and the deformation state under harsh conditions,such as earthquake-prone areas.Therefore,the analysis and Research on the structural measures and structural properties of beam-column joints of concrete-filled steel tubular structures is the most important task to deepen and popularize.It has mainly carried out the following research work:(1)Considering the characteristics of outer ring plate joint of concrete filled sleeve-type hollow square steel tube column-H-section steel beam,the finite element analysis model is established by ABAQUS software.The interaction between material and geometric nonlinearity,steel tube and concrete is considered in the model.The corresponding finite element model is made by combining the previous experimental study,which verifies the rationality of meshing and convergence of solution.The sleeve hollow square steel tube mixing is analyzed.The stress and failure characteristics of a typical example of concrete composite column-H-shaped steel beam are analyzed.(2)Carry out a model test of twelve outer ring plate joint of concrete filled sleeve-type hollow square steel tube column-H-section steel beam under monotonic load,and study the influence of the bearing capacity,ductility and failure modes of the combined nodes in different column section shape,column axial pressure ratio,sleeve thickness and steel beam height,steel type(3)Carry out the whole process analysis of the the outer ring plate joint of concrete filled sleeve-type hollow square steel tube column-H-section steel beam,and study the failure modes of the joints,the stress and deformation law of in core area of the joint,and the cooperative working characteristics of each component.And analyze the influence law of important influence parameters and provide the outer ring plate joints and the design suggestions and methods for the node construction measures. |
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