| Hybrid coupled wall system is a new structural system with steel coupling beaminstead of concrete coupling beam. It combines the advantages of both good plasticdeformability of steel beam and large lateral rigidity of concrete shear wall. Comparedwith the traditional reinforced concrete coupled wall, this new kind of system has betterenergy dissipation capacity, so it is more applicable in high seismic intensity area. Thestandard of this structure has been developed in US, and the structure was applied topractical engineering. But the domestic study on this new system still remains on thebearing capacity of joint and its failure mechanism, the research data of hybrid coupledwall system under seismic performance is very rare. Based on this kind of new structuresystem, the research group has put forward the concept of hybrid coupled wall systemwith steel boundary elements with arranging the steel column at the edge of wall, andcarried out the experimental and theoretical study on the seismic behavior of thissystem.Previous studies have shown that CR is an important parameter and a reflection ofshear wall integral working performance. In order to study the effect of coupling ratio(CR) on hysteretic behavior of innovative hybrid coupled wall systems with shape steelboundary elements, two1/3scale5storey model with CR=30%and CR=45%have beentested under cyclic loading. Based on the test results, the seismic behavior is evaluatedin terms of bearing capacity, rigidity degeneration, ductility, energy dissipation, and thefailure mode. Test result reveals that the new system dissipates energy by sheardeformation of steel beams and plastic hinge deformation at the bottom of wall, so theseismic behavior of shear walls can be significantly improved. When CR is equal to30%, the cracks in the concrete wall concentrated mainly in the bottom two storeys. When CR is equal to45%, the moment at the bottom of the wall has been reduced to alarge extent, and the steel beam has good deformability. Coupling beams at each layerbecome energy dissipating member setting along the full height of the wall andexpanding the scope of the energy dissipation, the hysteretic curve appears typicalstable "shuttle" form, and the structure is a multiple seismic system, satisfied thedemand of seismic ductility design.Based on the experimental results of hybrid coupled wall system with steelboundary elements, nonlinear finite element analysis was performed to simulate theoverall process under cyclic loading with FEM program ABAQUS. By adopting Pythonlanguage, a displacement-controlled loading program is put forward with the givenlateral force pattern. More than14examples of5series are analyzed after verification ofFEM. The major factors include CR, dimensions of wall, failure mode of steel beam,and the steel column settings and so on.According to the testing and FEM analysis results, the bearing mechanism ofstructure is analyzed, and a hybrid coupled wall system mechanical model of ultimatebearing capacity is suggested. The damage process include three stages: wall crack,steel coupling beams yielding, and shear wall failure. Based on the failure mode ofshear wall considering the effect of concealed column, the calculation formula of theultimate bearing capacity is derived under two kinds of failure form of coupling beamsand five kinds of failure form of shear wall, respectively. The test results and thecalculation results are in good agreement, it can be used to estimate the ultimate load ofstructure. Suggestions for seismic design based on the theoretical analysis and ChineseCode are presented at last. |
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