Finite Element Analysis Of Seismic Performance Of High Strength Steel Tube High Strength Concrete Column Frame Structure

With the rapid development of China's economy,reinforced concrete structures are gradually unable to meet the development trend of the construction industry.Because of its excellent seismic performance,concrete-filled steel tube(CFST)structure has been applied more and more in the field of engineering.At present,there are already relatively complete theories and norms,but there is a shortage of research on the application of high-strength materials for CFST.There are only a few experimental researches on the basic components of high strength steel tube and high strength concrete.In view of this,this paper uses the general finite element software ABAQUS to study the seismic performance of multi-layer high-strength steel tube high-strength concrete frame structure.Specifically carried out the following aspects of work:1)Introduce the basic analysis method of ABAQUS.Select reasonable constitutive relations and unit types,and correctly consider the bond-slip performance between steel pipe and concrete.The definition of analytical steps in static analysis and dynamic time history analysis,as well as the analysis method of structural self-vibration performance are introduced in detail.2)The load-displacement skeleton curves of a two-span and three-storey circular concrete filled steel tubular frame under cyclic loading are obtained and compared with the test results.The applicability of nonlinear finite element analysis based on ABAQUS platform in the static elastoplastic analysis of concrete filled steel tubular structures is verified.Relevant regulations based on existing specifications,high-performance concrete and steel are applied and finite element analysis is carried out when other parameters are basically unchanged.Compared with ordinary concrete-filled steel tube,the load-bearing capacity of the model of high-strength concrete filled steel tube has been improved,but the adoption of high-performance materials is not conducive to the improvement of ductility and energy dissipation.3)The theoretical basis for dynamic time history analysis of high rise CFST frames is introduced.Through the finite element simulation of the shaking table test of an eight-story circular steel tubular column structure model,the modal response and displacement reaction of the structure under earthquake are obtained.The rationality of the model is verified by comparison with the experimental results.On this basis,the structural model of high-strength steel tube high-strength concrete frame is designed and compared with theoriginal model.The results show that the high-strength steel tube high-strength concrete frame has good dynamic performance when the column size is reduced.