By collaborating specific mechanical devices with the dampers,the small vibration deformation of the building structure can be amplified and transmitted to the medium or large deformations of the damper,thereby improving the damper's suppression effect on structural vibrations caused by excitations such as wind or earthquakes.The deformation amplification device can significantly improve the dampers'working efficiency.After a comprehensive review of the main problems and applicational bottlenecks of the gear type,lever type,rotary type,and negative stiffness type deformation amplification devices of dampers,the main advantages of the toggle-type deformation amplification devices were analyzed.Furthermore,the characteristics and development needs of an advanced form of the toggle-type deformation amplification device,that is,the scissor-type deformation amplification device,were discussed.To tackle the global out-of-plane dynamic instability issue of the toggle-type and scissor-type deformation amplification devices,a new three-dimensional deformation amplification device was proposed.The configuration and mechanical model of the three-dimensional deformation amplification device were introduced,and the effectiveness of the device was demonstrated through a numerical example.Finally,based on the requirements of the engineering application of the damper deformation amplification device,further research needs for the theory and technology of deformation amplification devices were proposed,that is,to develop practical analysis and design methods for energy dissipation structures equipped with dampers'deformation amplification devices,and to develop new hinge connections between the deformation amplification device and dampers that bridges the"hidden gaps"in the joints.These developments will ensure that the toggle-and scissor-type deformation amplification devices are easy to design and can work efficiently and reliably.
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