Finite Element Analysis On The Hysteretic Behavior Of The New Hybrid Coupled Walls System

By using steel coupling beam instead of using traditional concrete coupling beam,the hybrid coupled wall structure combines the advantages of both concrete and steelstructure. This structure has a good bearing capacity and ductility, which can effectivelyimprove the seismic performance of the ordinary coupled shear wall structure. On theone hand, this new structural system can effectively reduce the bending momentundertaken by the individual, resulting in a more effective structure system; On theother hand as energy-consuming components, the beams along the wall full height canincrease consumption capacity of the whole structure system. Therefore, its depth studyhas important theoretical significance.Firstly, this article will introduce how to build a test model with a45%coupledratio, by using the finite element software ABAQUS6.10. It’s material and geometricnonlinear should be taken consideration in this model. Then thesis compares finiteelement calculation results and the experimental results. The analysis result prove thatthe experimental and analysis results have a good coincide in hysteretic curves, skeletoncurves, bearing capacity, ductility and energy dissipation properties. This verifies thevalidity of the finite element model.Subsequently, this article takes a12-store coupled shear wall structure engineeringproject as a prototype. Based on the prototype, the parametric study was carried out onthe seismic behavior of the system, which includes the coupling beam cross-section,failure mode of coupling beams, walls limb slenderness, steel beam yield strength, andaxis compression ratio of the wall, then it executes cyclic parameters loading andsimulation. The following conclusion can be obtained based on the analysis results:(1) Increasing the coupled ratio from30%to60%by change the coupling beam cross-section, which can improve the bearing capacity of the structure and the initialstiffness in a big degree. It a can get a more remarkable improvement in seismicperformance of the structure. The structure of coupled ratio at45%can get the bestseismic performance. It is recommended to set coupling ratio from45%to60%, whichis more suitable for used in high seismic intensity area.(2) The hysteretic curve of the shear-critical steel coupling beam yield has morefull bearing capacity than that of flexural yielding beam. It also makes a greatimprovement in energy dissipation. In general, the shear mode has better hystereticbehavior than the curved mode. So the coupling beam should be designed as shearyielding in prior to flexural yielding.(3) Increasing the pier of the specimen aspect ratio will get a reverse effect-reducing the hysteretic behavior of pier, which include both the bearing capacitydecline and energy dissipation capacity reduction in a large degree. The main reason isthe result of structural integrity coefficient decreases. In the design, we should ensurethe integrative coefficient decrease before improve the structure of the coupling ratio.(4) Increasing the steel beam yield strength of the structure will bring a slightimprovement in the bearing capacity, initial stiffness. On the contrary, there will be aslight reduction in specimen ductility and energy dissipation. The yield strength of thesteel beam has not big effect on the seismic performance of the structural systems.(5) The bearing capacity, ductility and energy dissipation capacity is notsignificantly affected by increasing the axis compression of the wall. It s recommendthat we can take the axial compression ratio from0.2to0.4.Finally, based on the finite element analysis, thesis gives some related designrecommendations about post-test research outlook, seismic design advice.