Experimental Study And Theoretical Analysis Of The Lead Extrusion Friction Composite Damping Device

Energy dissipation technology belongs to the category of passive control.Dampers are used to absorb seismic energy in advance of the structure,the seismic energy input to the main structure is reduced by installing dampers.The energy dissipation technology has been widely studied.The significant energy damping effect of the technology has been proved by many actual projects.A new damping device is proposed.The device is combined of the lead extrusion damper and the friction damper.The damping value of the device can be changed by adjusting the parameters of the device properly.Then,the well damping effect can be achieved when the structure suffered from different strength earthquake.The device is made up of steel plates.The device has working mechanism of lead extrusion damping and friction damping.It can be assembled conveniently.The accessories of the damper,such as bulge and friction plate and so on,can be changed according to the actual needs.The hysteresis characteristic of the friction damper can be changed by adjusting the bolt.The force of the friction damper increases linearly with the increase of loading displacement.The mechanism of the device is clear,it can be analyzed by using the plane model.In this paper,the damping device is studied from the aspects of theoretical analysis,numerical analysis and experimental study.Then,the device is used on the structure for vibration reduction analysis.The main work is as follows:(1)Damping value of the device can be changed by reasonable structure design.The force-displacement relationships of the device are deduced by the theoretical deduction.Result indicates that multiple hysteresis characteristics are obtained through parameter adjustment of the device.Hysteresis curve of the device is obtained by the numerical calculation using finite element software-ABAQUS.Influence of grid size to the hysteresis performance of device is studied.Influences of bulge’s size and friction coefficient to the hysteresis characteristic of the device are studied.Numerical study results show that the hysteresis curve of the lead extrusion damper is close to rectangle,the typical hysteresis curve of the friction damper is close to"butterfly wings".(2)Practical model of the device is manufactured.Cyclic loading test of the model is carried out with the MTS loading device.Tests of the pure lead extrusion damper and the pure friction damper are carried out separately.Test results show that the experimental results are in close agreement with the results of theoretical analysis and numerical analysis.The experiment phenomenon is analyzed,and the reasonable suggestions on the use of the device are proposed.(3)Three-dimensional model of the structure system is established by using the ETABS software.The most typical hysteresis characteristic of the damping device is simulated by the combination of connection units.Time history analyses of the structure are performed.Different characteristics of the damping device are simulated by using different parameters of the connection units.Influences of device’s different characteristic to the damping effect are studied.Results indicate that the damping effect of the device is significant.