Research On Damping Control Of Structure With Displacement Amplification Type Friction Damper

Energy dissipation technology is an effective way to improve the seismic performance of structures and reduce earthquake losses.The damper is usually installed between the floors of the structure,which consumes energy in the earthquake,so as to ensure the safety of the main structure;However,if the interlayer displacement is small,the damper can not give full play to the energy dissipation capacity,which will affect the shock absorption effect.In view of this,this paper proposes a displacements large friction damper,and studies its damping control of the structure.The main work and conclusions are as follows:1.A gear based displacement amplification device is designed,and it is combined with the common friction damper to develop a large displacement damping device.The working mechanism of the large displacement friction damper is revealed and its ideal elastoplastic mechanical model is established.The mechanical properties of the large displacement friction damper were experimentally studied,and the hysteresis characteristics(energy dissipation per unit cycle,secant stiffness and equivalent damping ratio)of the damper were analyzed as a function of the displacement amplitude.2.Taking the six-story regular steel frame structure and the five-story plane irregular steel frame structure as examples,ETABS finite element software was used to calculate the seismic response of the uncontrolled structure,the ordinary friction damper damping structure and the large displacement friction damper damping structure.The results show that: The large displacement damper can consume more seismic energy than the ordinary friction damper,and can better control the interlayer displacement Angle and vertex displacement of the structure(regular structure and irregular structure),but the control of base shear force is sometimes inferior to the ordinary friction damper.