Elaborate3D Finite Element Analysis On The Seismic Performance Of Multi-story Steel-concrete Composite Frame Structures

Abstract:At home and abroad, the analysis on the seismic performance of steel-concrete composite frame structure is mainly studied by the pseudo dynamic test method of simple frame style and the finite element analysis of linkage, but the application of elaborate3D finite element analysis method is rare. In this thesis, the ABAQUS finite element software is used for the elaborate3D finite element analysis of the seismic performance of multi-story steel-concrete composite frame structures. The main research contents are as follows:(1) The basic theories of ABAQUS was introduced and the finite element model of steel-concrete composite frame structures was established using ABAQUS and the modal analysis method was suggested based on the concrete plasticity-damage constitutive relation, steel elastic-plastic hardening monotonic loading constitutive relation and hybrid reinforced cyclic loading constitutive relation. Further, the vibration performance of the composite frame structures was analyzed and its natural vibration frequency was obtained.(2) On the basic of static analysis, finite element software ABAQUS was used for the analysis of concrete-filled steel tubular (CFST) stub columns of octagon section, and the results were verified with experimental results, a practical calculation formula for the ultimate bearing capacity of CFST stub columns of octagon section was proposed; On the basic of Pseudo-static analysis, finite element software ABAQUS was used for the hysteretic analysis of circular concrete-filled steel tubular columns, square concrete-filled steel tubular columns, steel-concrete composite beams, column-beam joints and circular concrete-filled steel tubular column-steel beam composite structures and the results were verified with experimental results. On the basic of Pseudo-dynamic analysis, finite element software ABAQUS was used for the elastic-plastic seismic response analysis and comparison on the existing test model of steel-concrete composite frame.(3) Based on the reasonable constitutive relation of concrete and steel, finite element software ABAQUS was used for building an elaborate3D finite element solid model of a steel-concrete composite frame structure of3×3span with10layers. The displacement time history response of every layer and the stress time history response of the keys parts of steel tube, core concrete, steel beam and the stud were analyzed under8kinds of seismic waves. The interaction between steel tube and concrete and the role of the energy consumption of studs were discussed under the seismic action. The results shows a good dynamic performance of the steel-concrete composite frame structure under the seismic wave action.