Research On Hysteretic Behavior Of A Novel Steel Pipe Friction Damper And Vibration Control Of Double-layer Reticulated Shell

Large-span spatial structures have wide application in high-speed railway stations,stadiums and convention centers,and other intensive public buildings.The great seismic performance of the structure is of great significance to the people’s lives and property.In this paper,the passive control device of large-span spatial structure is investigated.Combined with the characteristics of long-span spatial structure members,which are mainly steel circle pipe and some members subjected to axial force,a novel steel pipe friction damper suitable for replacing the member is proposed.The test and numerical simulation of the damper are carried out.The effects of displacement amplitude,friction material,pre-tightening force of a single high-strength bolt and the number of high-strength bolts on the hysteretic behavior are analyzed,respectively.The stability of hysteretic behavior under multiple cyclic loading is also verified.Based on the experimental and numerical simulation results,the mechanical model of the damper is determined.Finally,SPFD is applied to the double-layer reticulated shells,and the analysis of seismic performance of structures is carried out.Double-layer reticulated shells are established and a damper arrangement method based on modal additional damping ratio is adopted.The effects of replacement rate,earthquake intensity and ground motion on vibration reduction effect are studied,respectively.The main conclusions are as follows:(1)Hysteretic curves are full and have rectangular shape.The numerical simulation results agree well with the experimental results.The deviation between the experimental value and the simulated value of mechanical performance parameters is within ±25%.(2)Parameter analysis results of SPFD show that single-cycle energy consumption of the damper increases linearly with increasing displacement amplitude,while equivalent stiffness decreases with increasing displacement amplitude.The increase of pre-tightening force of a high-strength bolt or the increase of the number of high-strength bolts will significantly improve single-cycle energy consumption and equivalent stiffness of SPFD.Compared with the damper with steel friction plates,the damper with aluminum alloy or brass plates has a larger single-cycle energy consumption and equivalent stiffness.The equivalent damping ratio of the damper is always stable.Stable hysteretic behavior was verified by almost unchanged hysteretic curves in 30 cycles of cyclic loading.(3)Analysis results of seismic performance of double-layer reticulated shells show that the reduction effect of the damper increases first and then decreases with increasing replacement rate.The reduction effect is relatively satisfactory when the replacement rate is between 6% and 14%.The damper is effective in reducing the seismic response of the structure under the action of strong earthquake.And SPFD can generally reduce seismic response of structure under action of selected ground motions.For Tianjin ground motion and Kobe ground motion,the reduction effect of the damper is better than that for the four long-period ground motions.