Research On Seismic Performance Of High Ductility Double Steel Plate Energy Dissipation Wall With Force Control And Anti-buckling Bracing

As a new type of lateral force-resisting structure system,steel plate energyconsuming wall force control anti-buckling bracing has superior seismic performance compared with traditional steel frame bracing and steel plate shear wall structure,and can effectively avoid the defects and shortcomings of both of them in the process of use.By replacing the common single-layer wall plate with double-layer anisotropic wall plate to form a double steel plate energy dissipation wall force-controlled anti-buckling support structure,the double-layer wall plate is only subjected to unidirectional force under cyclic loading,which significantly delays the metal damage of the wall plate and improves the ductility and energy dissipation capacity of the structure while having high bearing capacity and lateral stiffness.In this paper,a series of studies are conducted on the seismic performance of the force-controlled buckling-proof braced structure of double steel plate energy-consuming wall using a combination of proposed static tests and numerical simulations.Firstly,a double steel plate energy-consuming wall force-controlled buckling-proof braced specimen and an air frame comparison specimen are designed according to the relevant codes and subjected to the proposed static loading tests to study and analyze the seismic performance indexes such as hysteresis curve,skeleton curve,bearing capacity and stiffness degradation,ductility and energy dissipation capacity of the two specimens,analyze their yielding mechanisms and damage modes,and investigate the changes of the brace axial force,beam-column corner and wall-slab bulge deflection during the loading process.Secondly,the finite element software ABAQUS was used to establish a refined model of the specimen,and the seismic performance and damage pattern were analyzed and compared to verify the reliability of the finite element simulation.Then,the effect of span ratio and flexibility coefficient on its seismic performance was investigated by using the method of controlling a single variable for its parametric analysis.Finally,the stresses of each member of the structure when it is subjected to horizontal loads are analyzed,and the formula for calculating the ultimate bearing capacity of the structure as a whole is proposed and verified.The research results show that the new lateral force resistant structural form of double steel plate energy dissipating wall force control anti-buckling bracing has high bearing capacity and lateral stiffness resistance,stable bearing capacity and stiffness degradation,and particularly outstanding ductility and energy dissipation capacity.Under the action of horizontal load,the double wall plates,braces and internal frames successively yield and participate in energy dissipation,and the structure has a reasonable yielding mechanism and damage pattern to meet the requirements of multi-channel seismic protection.The span ratio has a large influence on the ductility of the structure,the larger the span ratio,the higher the ductility,and the recommended span ratio is0.5～0.6.While ensuring that the structure has high ductility,the flexibility factor should not be greater than 3.0 in order to give full play to the lateral resistance of the wall panels.The lateral stiffness of the structure mainly comes from the double wall plate and the inner frame,and the lateral contribution of the braces is negligible,and the theoretical formula of the bearing capacity obtained through the force analysis of the members has a high accuracy.