Study On Hysteretic Behavior Of A High Damping Rubber Incorporated Variable Friction Damper

With the increase of world population and economic development,the losses caused by earthquake disasters are becoming more and more serious.Therefore,it is an important subject in the field of civil engineering to ensure that buildings and structures do not destroy or collapse during earthquakes.Friction energy dissipation technology and viscoelastic energy dissipation technology belong to the category of passive control.At present,they have achieved rapid development in practical engineering applications,which verifies their good energy dissipation effect.Traditional friction dampers only have a single friction force,so it is difficult to set the appropriate friction force:if the friction force is high,it will provide excessive stiffness to the structure,and the damper will not produce energy dissipation effect under small earthquakes;if the friction force is low,the energy dissipation effect required by the structure can not be produced under large earthquakes.Therefore,it is necessary to design and develop variable friction dampers.On the other hand,as a kind of viscoelastic material,high-damping rubber material has strong energy dissipation ability under earthquake.Compounding high-damping rubber material into variable friction damper can not only enhance the energy dissipation effect of variable friction damper,but also make variable friction damper have self-resetting function.In this paper,a high-damping rubber incorporated variable friction damper is designed,which combines traditional friction dampers and high-damping rubber materials.The advantages of the damper are as follows:(1)By setting different friction coefficient zones,the friction force of the damper is variable,and the problem that the traditional friction damper only has a single friction force is solved.(2)The friction of the damper is controllable.By adjusting the bolt force,the damper can produce different hysteretic performance and meet different energy dissipation requirements.(3)The damper contains two energy dissipation mechanisms:friction energy dissipation and viscoelastic energy dissipation,and the energy dissipation effect is better.(4)Because of high damping rubber,the damper has the function of self-resetting.Based on the design of the high damping rubber incorporated variable friction damper,the main work is as follows:(1)The reasonable design of the high damping rubber composite variable friction damper is carried out,the structure and working principle of the damper are introduced,and the theoretical calculation formulas of the damper's damping force and stiffness in different working stages are deduced.(2)The axial mechanical properties of high damping rubber materials were tested.Through static loading and cyclic loading,the stress-strain relationship of high-damping rubber under static loading was analyzed,and the hysteretic behavior of high-damping rubber under axial cyclic loading was studied.(3)The hysteretic performance of high damping rubber composite variable friction damper was analyzed by using Abaqus finite element analysis software and the axial mechanical test data of high damping rubber.The results show that the hysteretic performance of the damper depends on the hysteretic performance of variable friction damper and high damping rubber.The selection of displacement amplitude,bolt force,friction material and high damping rubber material will affect the hysteretic performance of the damper.(4)The energy dissipation effect and self-resetting function of high damping rubber composite variable friction damper are analyzed.The results show that the high damping rubber enhances the energy dissipation effect of the variable friction damper,and makes the damper have a certain self-resetting function..