| Compared with traditional energy dissipation dampers,metal dampers are widely used in buildings and bridges to achieve energy dissipation through buckling deformation.Low yield steel is widely used in core energy dissipation components of metal dampers because of its good mechanical properties.Scholars at home and abroad have studied the shear plate dampers made of low yield steel.Based on the research status of metal shear plates at home and abroad,a new type of variable stiffness energy dissipation damper with low yield and high load is designed.Energy dissipation by low yield point steel under small earthquake action.The steel plate in the lifting area consumes energy under the action of large earthquake.The principle of replaceable steel plate at low yield point in energy dissipation zone is realized after earthquake.The device is optimized and theoretically analyzed by finite element analysis.The main research contents include the following:The theoretical calculation formula of the bearing capacity of steel plate and bolt under shear stress is given for the new type of variable stiffness energy dissipation damper.This method provides the basis for the design of mechanical properties such as damper strength and stiffness.According to the disadvantages of the new variable stiffness energy dissipation damper,the corresponding optimization design is carried out.The optimal structural measures satisfying the concept of seismic design are determined by comparing the finite element stress-strain cloud map,hysteresis curve and bearing capacity curve.In the shear stress state,a new type of variable stiffness energy dissipation damper with optimal structural measures is analyzed.The parameter analysis includes the section form of low yield steel plate in energy dissipation zone,the thickness ratio of low yield steel plate in energy dissipation zone,shear threshold displacement and so on.the hysteresis curve,skeleton curve,maximum horizontal bearing capacity,energy dissipation per stage loading,equivalent viscous damping coefficient of the damper are analyzed under cyclic loading displacement.In order to simulate the actual deformation mode of a new type of variable stiffness energy dissipation damper after transverse connection of shear wall structure.A kind of loading device with high stiffness and recycling is designed.The energy dissipation performance and parameter analysis of damper under complex bendingshear stress are analyzed.The parametric study of damper is consistent with that of shear stress.The hysteretic curve,skeleton curve,maximum horizontal bearing capacity,energy dissipation,equivalent viscous damping coefficient after finite element simulation are analyzed. |
