Rectangular Steel Tube High Strength Concrete Frame Structure Seismic Performance Research

Because of high bearing capacity, ductility and energy dissipation ability, Concrete Filled Steel Tubular Structure is widely used in high-rise buildings. At present, the static and dynamic performance research of Concrete Filled Steel Tubular component and node is systematic and intensive. And the overall seismic performance research of Concrete Filled Steel Tube Structure System is less, experimental study is relatively lacked of, especially the test data of High Strength Concrete Filled Steel Tubular Structure System, to some extent, it limits the engineering application of Steel Tube High Strength Concrete Structure. Therefore, this article designed a Rectangular Steel Tube High Strength Concrete Frame Structure specimen and experimental program, and based on static push test and numerical simulation analysis of the framework, we study its seismic performance. The main research work is as follows:(1) According to China's current rules and regulations, combined with the requirements of test equipment capacity, the paper designs and constructs a common single-span, two layers Rectangle Steel Tubular High Strength Concrete Frame Structure Model. Based on quasi static test of the framework, this paper obtains the displacement, force and strain of important parts of the structure, and the hysteretic curve and skeleton curve of the structure, analyzes its bearing capacity, deformation capacity, energy dissipation capacity and strength and stiffness degradation. At the same time, combined with the development of the plastic area, it explorates the position, sequence and property of plastic hinge appeared in the process of experiment, discusses the failure mechanism and morphology of model structure. The comprehensive and thorough analysis can provide certain theoretical basis for engineering practice.(2) The paper establishes finite element analysis model of test frame structure by the nonlinear analysis program Perform – 3D, based on pushover analysis, it compares the skeleton skeleton curve of numerical simulation and test curve, to verify the rationality of the finite element model. On this basis, it expands parameter analysis of the structure, it contrasts to explore influence of axial compression ratio?horizontal loading mode?steel yield strength on the seismic performance of Rectangular Steel Tube High Strength Concrete Frame, and forms regularity of cognition.