Steel - Concrete Composite Frame Hysteretic Performance Of Nonlinear Finite Element Analysis

At home and abroad, the static behaviors of the steel-concrete composite structure has done a great deal of experimental study and theoretical research, but the hysteresis behaviors of the steel-concrete composite structure in low cyclic loading reviewed in test primarily and theory complementary. This paper uses the finite element method to analyse the static behaviors and the hysteretic behaviors of the steel-concrete composite structure. The main research contents are as follows:(1) Choose a concrete uniaxial constitutive relationship which is suitable for using ABAQUS, and based on the damage mechanics, propose the calculation formula of damage variables, establish concrete damaged plasticity model under the repeated loading and cyclic loading;(2) Using ABAQUS builds finite element models of the concrete filled steel tubular component under axial compression, eccentric compression,pure torsion, the arch rib and steel-concrete composite beams subjected to bending, and coMPared with the existed test data, through the analysis of the typical load-deformation curve of concrete filled steel tubular component under axial compression, eccentric compression, pure torsion, and the steel-concrete composite beams subjected to bending, discuses the mechanical properties of the concrete filled steel tubular component and the steel-concrete composite beams component;(3) Using ABAQUS present nonlinear finite element analysis of the CFST bending behaviors component and the steel-concrete composite beams subjected to bending under cyclic loading, based on these, build 3D finite element models of the steel beam to CFST tube column connections and frames, and the calculated results are coMPared with the test results. Through typical examples, the hysteretic behaviors of CFST tube column, steel-concrete composite beams and steel beam to CFST tube column frames under cyclic loading are analyzed;(4) Using ABAQUS builds 3D finite element models of the steel-concrete composite beam to CFST tube column frames at constant axial plane and horizontal reciprocating load, mainly analyses the influence of the axial compression ratio on the hysteretic behaviors; When the role which the concrete board play in the steel-concrete composite beams is not considered, build corresponding finite element models of the steel beams, iMPact the the influence to the hysteretic behaviors of the steel-concrete composite beam to CFST tube column frames when the contribution of the concrete board is considering or not.