Research on mechanical performance and seismic energy dissipation effect of U-T slope variable friction damper
In order to solve the problem that the normal friction damper can only produce single damper force and cannot meet different energy dissipation demands under different ground motion levels,a U-T slope prototype mechanism was proposed,which can generate incremental deformation in the normal direction due to the slope action when the displacement occurs away from the full occlusion point,and the slope maintains a continuous contact in the process.Based on this prototype,a variable friction damper capable of generating'dog-bone-shaped'hysteresis curve was designed and tested.The experimental results show that the damping force of the damper is basically consistent with its design value,the damper shows a well fatigue resistance and meet the mechanical performance requirements for friction energy dissipation device in JGJ 297-2013'Technical specification for seismic energy dissipation of buildings'.Finite element analysis is carried out for the damper to verify its working mechanism and the working state of each component of the damper.Using ABAQUS software as the platform and using its user material interface(UM AT),a UM AT subroutine for simulating the dog-bone hysteresis curve damper was written and used as a tool for numerical simulation analysis.Taking a steel frame structure with dampers as an example,the damping effects of frame with dog-bone hysteresis curve variable friction dampers and frame with ordinary friction dampers were compared and analyzed,indicating that the dog-bone hysteresis curve variable friction dampers have better damping effects,and it is not sensitive to the loss of pre-tightening force.
variable friction damperU-T slopeenergy dissipationpassive vibration controlhysteretic curveadditional damping ratio
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