| At this stage,steel frame structures have broad prospects for development in the application of multi-story,high-rise and super-tall buildings and large-span structures.Compared with other building structures,it has the advantages of high strength,high rigidity,good stability,good integrity,light weight,high bearing capacity,stable seismic performance,good hysteretic performance,high construction efficiency,and short cycles.It has become one of the most popular structural forms in the construction of modern cities.Compared with other countries,the development of related aspects of China’s steel structure is relatively slow and lagging behind.Therefore,we should intensify our research on the technical level of steel structures.In this paper,through the combination of tests and finite element analysis models,the mechanical performance of square steel tube columns-H-shaped steel beam flange outer ring plate connection nodes is studied.The details are as follows:1.The feasibility of the finite element software ABAQUS modeling and analysis was verified by comparing the results of the low-cycle reciprocating cycle test of the flanged outer ring plate joint with the finite element modeling analysis.2.The finite element analysis software ABAQUS is used to further expand the parameter analysis of the flange outer ring plate joints.The study parameters include the structural form of the reinforced ring plate corners in the core area,the magnitude of the column top axial pressure,and the thickness and strength of the reinforced ring plate.Effects of modes and seismic performance.The test results show that the reinforced ring plate joint with a chamfered form overcomes the defect of stress concentration of the reinforced ring plate joint with a right-angled form,and the hysteresis curve is full,and the bearing capacity is increased.As the axial pressure increases,P-Δ effect is more obvious,the area of the high stress area of the flange becomes larger,the ultimate bearing capacity is reduced,and the energy consumption capacity is increased;within a certain range,the node core is improved by increasing the thickness and strength of the ring plate The stiffness of the zone reduces the deformation of the strengthening ring plate,and the ultimate bearing capacity and energy consumption capacity of the joint are increased.3.The mathematical statistical software Origin is used to fit the flange outer ring plate joint test data made by the research group to obtain the fitted skeleton curve and the loading and unloading stiffness.Finally,by describing the hysteresis law,the outer flange is obtained.The tri-fold line restoring force model of the ring plate joint,the comparative test hysteresis curve shows that although the restoring force model has errors,it is still reasonable. |
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