| Coupling beams are important energy-consuming components in the joint-shaft shear wall structure.Traditional reinforced concrete coupling beams are damaged by lateral forces or earthquake loads and can hardly be repaired or replaced.With the deepening of related research,researchers at home and abroad in the earthquake engineering community have begun extensive research on replaceable coupling beams.By replacing the connecting beam in the structure,the plastic development mechanism of the coupling beam is changed,and the damage under the rare earthquake is eliminated.Concentrate on the replaceable section in the middle of the coupling beam and the coupling beams at both ends maintain the elastic state.After replacing the replaceable section after the earthquake,the structural use function can be quickly restored.The interchangeable steel coupling beam is formed by connecting the non-energy-dissipating beam sections at both ends and the middle energy-dissipating beam section through reasonably designed connection methods.By weakening the middle section,the yield energy is lost under the earthquake,and only the energy dissipation section is replaced after the earthquake.It can be used again.Repair is simpler and less expensive.In this paper,we study a hybrid joint shear wall composed of interchangeable steel coupling beams and RC wall limbs.The main research contents are as follows:(1)This article first introduced the research background,research status,and practical engineering applications of interchangeable coupling beam coupled-limb shear walls.The theoretical analysis of the interchangeable steel coupling beam shear wall was conducted by consulting the literature and related formulas.The principles of priority yield,concentrated deformation and ultimate displacement control for the energy dissipating girder section of the replaceable steel coupling beam are deduced,and the calculation formulas for the shear capacity and lateral stiffness are given.(2)Through the introduction of existing foreign experiments,based on the ABAQUS platform for numerical simulation analysis of the test,the hysteretic curve,skeleton curve,energy dissipation performance and stress cloud diagram extracted from the test results and numerical simulation were compared and analyzed to verify the reasonableness of the numerical simulation method.Sex.(3)The effects of the stiffness ratio(ratio of stiffness of energy dissipation beam segment and non-energy dissipating beam segment)and the length ratio of energy-dissipating beam segment on the seismic performance of two-leg shear wall with interchangeable steel coupling beams were studied respectively.The results show that under the condition that the structure can be well deformed by force,the stiffness ratio of 0.39-0.42 is the most reasonable.With the increase of the length ratio of the replaceable section,the bearing capacity of the steel coupling beam is gradually reduced.When the length ratio is between 0.32 and 0.38,the reduction of the length ratio of the energy dissipating beam section weakens the bearing capacity of the coupling beam,and the deformable energy dissipation capacity of the replaceable steel coupling beam is stronger,so the ratio is the most reasonable.(4)In order to verify the shock absorption effect of replaceable steel coupling beams,the elastic-plastic time history analysis of the original structure and new structure of the high-rise joint shear wall before and after the replaceable steel coupling beam is performed.The analysis results show that: The steel coupling beam has a certain energy dissipation effect,and the seismic performance of the limb shear wall is improved.In addition,the impact of the arrangement of replaceable steel coupling beams on the structural damping effect was analyzed by changing the positions of the interchangeable steel coupling beam,indicating that the replaceable coupling beam should be set in a position where the displacement between the layers has changed greatly,and this can be achieved optimal shock absorption. |
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