Seismic Response Analysis Of T-Shaped Concrete-Filled Steel Tube Frame Structure With Side-Plates

At present,because of its high bearing capacity and good structural characteristics,the special-shaped concrete filled steel tube structure is being used more and more to the field of construction engineering.The common sections are L,T,H,cross,polygon and so on.Under the same external load and structural stiffness,the cross section concrete filled steel tube column can be smaller than the traditional section structure section,and the special-shaped concrete filled steel tube frame structure is more conducive to the sustainable development of the society and economy,and it is becoming more and more common for its attention and application.At present,for the special-shaped CFST frame structure,there are many problems such as lack of structural measures,uncertain load characteristics and fewer nodes.In this paper,a single span two story concrete-filled steel tubular frame with single cross section with T shape and a concrete filled steel tubular frame with T,L and rectangular concrete-filled steel tube columns are proposed,and the method of combining theoretical analysis with numerical simulation is studied.First,the software ABAQUS is used to establish a single span two story single span concrete filled steel tube frame structure model of the side plate connection T form,and the static calculation is carried out to discuss the stress characteristics.Secondly,a steel tube concrete frame structure consisting of T,L and rectangular concrete-filled steel tube columns is established in ABAQUS,and the mechanical characteristics of the frame structure are discussed.Signs,working mechanism,failure characteristics,dynamic characteristics and seismic response.The specific contents are as follows:(1)In order to test the rationality of the model,a single span concrete filled steel tube frame structure with single span and single span of T form is proposed.In this paper,the same concrete steel tube frame structure is established as the research object,and the rational steel and concrete constitutive relation,single element type,mesh division and so on are selected,and ABAQU is applied.The frame structure is simulated by S,the vibration mode and mode of the frame structure are discussed,and its seismic effect is studied,such as the maximum displacement response curve of each layer and the maximum shear response curve of each layer.The results of the study show that the simulation and test results are more consistent.The rationality of the modeling is proved to provide an example for the simulation analysis of the T shaped concrete filled steel tube frame structure of the side plate connection.(2)In this paper,by using the above modeling method,a single span two story concrete filled steel tube frame with single span and single span of T shaped side plate is established,and the stress characteristics and seismic performance of the frame structure under pseudo static action are discussed.The hysteretic behavior,stiffness degradation and displacement ductility of the frame structure are analyzed,and the influence of the change of axial compression ratio,the change of length and length ratio and the change of steel tube wall thickness to the deformation and stress of the frame structure is considered.The results show that the change of the axial pressure ratio is not much affected;the thickness of the steel tube has great influence on the frame structure,the thicker the wall of the steel pipe,the better the earthquake resistance of the frame structure,the larger the ratio of the parameters to the frame structure,the smaller the ratio of length to length,the better the dissipation performance.(3)In this paper,according to the node form in the literature,the frame structure is established according to the actual model 1/10,and a concrete filled steel tube frame structure model composed of T,L and rectangular concrete-filled steel tube columns is designed,and the seismic response of the concrete under the action of several seismic waves is discussed.The results show that the greater the acceleration is,the greater the amplitude of the seismic displacement at the maximum displacement curve at the top of the structure,and the response of the whole frame structure to the displacement of the seismic waves is more intense.The internal force of the whole frame structure is in turn between the floor,the beam and the column,and the stress in the whole time course is mostly concentrated.At the junction of slab and beam columns,the connection area.