Elastic-Plastic Stability Analysis Of High-Strength Concrete Filled Steel Tubular Frame Under Earthquake Action

CFST frame due to its good seismic performance, has been more and more applied toengineering practice, especially in high-rise buildings, bridges, subways and large spanindustrial plant.The static, quasi-static tests and theoretical researchs of concrete filled steeltube are relatively more and the researchs of dynamic performance of concrete filled steeltube are relatively few. In this article,The CFST frame elastic-plastic time history is analyzed,its dynamic performance is studied.This paper studies the work:1.High-strength concrete filled steel frame inelastic displacement amplification factorThe28kinds of CFST frame are designed in accordance with the different cycles, andthe dimensions and parameters of the framework are given, the ABAQUS is adopted toanalysis the nonlinear seismic of the framework, the elastic and elastic-plastic layerdisplacement of the framework under the action of different seismic wave are obtained, thusthe inelastic displacement increasing coefficient is calculated; According to the yield shearcoefficient of the floor and the fundamental vibration period of the structure, the inelasticdisplacement increasing coefficient is studied,the empirical formula of elastic-plasticinterlayer displacement increasing coefficient is given by nonlinear regression analysis;2. The dynamic stability and collapse prevention design of high-strength concrete filled steelframeThe12kinds of frame for dynamic stability analysis are selected depending on differentaxial compression ratio,the ultimate displacement of the structural dynamic instability offramework under the action of three seismic wave are obtained. Several methods to determinethe ultimate displacement are introduced, and compare and research the several methods,from the perspective of structural deformation, the recommendations of CFST frame collapseprevention design in the actual project are proposed.The results of this study provide a reference for the seismic design of CFST frame.