| Node is an important part of the structure connecting the beam and column members,which can effectively transfer the internal force of the beam to the column members.Its design method,structural measures and mechanical performance will directly affect the overall working performance of the structure.Steel beams of concrete filled steel tubular column node connection form of study has certain limitations,the research focuses in the concrete-filled steel tube column-H steel beam connection nodes,and focus on traditional ordinary beam-column node,the node size is relatively small,the traditional form is relatively single node connection,with the increase of complexity and structural system under load,single node connection mode can't meet the requirements of structural force.Underground space structure is one of the important development direction in the field of building structure,with the increase of underground structure design span and height,gradually increase demand for the beam structure,the overlying soil under the action of load,load and so on overload,beam section size tend to be very big,need to adopt box girder at the same time improve the torsional and flexural bearing capacity of components,because in the past for box beam of large complex steel pipe concrete column node study is less,the design of large complex beam-column joints become composite structure is one of the main limiting factors in the practical engineering application,therefore,It is necessary to study the connection mode and stress mechanism of the joint of concrete filled steel tube column and steel box girder.In this paper,the static performance of this new type of joint is studied through finite element simulation analysis.The research contents include the following three aspects:(1)The overall stress analysis results based on the structural system,the selection of structure system to maximize internal force and stress of typical key nodes,combination of test site and test conditions and other comprehensive factors determine the key node scale ratio of 1:5,and simplified design node in scale,determine the detailed size of the test node and the specific connection structure,determines the 4 point load test plan,and formulate the test measurement scheme and the loading system,to ensure the smooth implementation of the test.(2)Finite element software ABAQUS was used to establish the finite element model of the joint of concrete-filled steel tubular column-steel box girder,and the material setting parameters,element types,mesh division and loading methods of the joint model were determined.The correctness of the finite element model is verified by comparing with the experimental results.On this basis,the design parameters of the typical node are selected,the finite element simulation of the typical node is carried out,the stress state of each part of the node is analyzed,and the failure mode of the typical node is analyzed.(3)Using the finite element software combination of concrete-filled steel tube column and steel box girder node to a large number of parameter analysis,analysis of the steel yield strength and beam size,the size of the ring plate,stiffener size,partition size and other parameters on the bearing capacity and stiffness,the influence of the analysis of various parameters on the node force mechanism and the influence law of failure mode.The results show that the yield strength and beam section parameters are the main factors affecting the bearing capacity of joints,and the type,position and structure of stiffeners are the main factors affecting the stiffness of joints. |
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