Concrete Filled Steel Tubular Frame Structures Under Static And Dynamic Elastic Plastic Analysis

Concrete filled steel tube made of steel and concrete of two materials which are combined. Steel is isotropic, stable mechanical performance, high strength advantages, but there are many shortcomings restrict its application; while the concrete is compressive performance, high plasticity, the price is relatively low, but its tensile strength is very poor. As a result of concrete filled steel tube in the two material in the stress process interactions, the concrete filled steel tube structure has better stress function, and thus obtains the widespread application. Therefore, can be seen on the concrete filled steel tube for static and dynamic elastic-plastic analysis is very necessary.In this paper, on the basis of previous studies, using the"unified theory of concrete-filled steel tube", adopts the axial compressive stiffness method and bending stiffness of reinforced concrete structure as the steel pipe concrete structure equivalent, using finite element analysis software Sap2000to carry on the elasto-plastic static and dynamic elastic-plastic analysis, to further investigate the seismic performance of concrete filled steel tubes tructure.1. Three different layers of the reinforced concrete columns with axial compression stiffness equivalent and flexural stiffness of reinforced concrete structure method of steel pipe concrete structure equivalent, equivalent to the steel tube concrete structure performance evaluation.2. On three reinforced concrete structure model and equivalent to six concrete filled steel tube structure model for static elasto-plastic analysis of Pushover, observing the various structural model at performance point shear, displacement and plastic hinge distribution, based on the structure of floor displacement and inter-storey displacement analysis, verification of concrete filled steel tubular structure some seismic performance.3. Using finite element analysis software Sap2000, the concrete filled steel tube structure, reinforced concrete structure for nonlinear dynamic calculation and contrast.