Research On Vibration Control Of High-rise Steel Frame Structure Under The Action Of Floor Damper

As the country pays more and more attention to the protection of ecological environment,Due to its unique advantages in energy conservation,emission reduction and circular economy,It is widely used in modern architecture.However,due to the high strength and gentleness of the material,the structural damping of the steel structure is relatively small.In particular,high-rise steel frame structures are prone to vibration under wind load and seismic load.The structure is prone to fatigue damage,local instability and even collapse of the whole structure.Because the vibration will bring serious hidden danger to the normal use of the structure,the vibration control of high-rise steel structure has become the key point of high-rise steel structure design.This paper mainly studies the vibration control effect of floor damper on high-rise steel frame structure.The main research work is as follows:(1)SAP2000 is used to set up a 3d finite element model of floor damper.Modal analysis of the original structure and the structure controlled by the floor damper,The influence of damper on the structure mode is analyzed,and the vibration mode is observed to determine the direction of load excitation.In order to compare the influence of different damper layout schemes on its vibration control effect,three kinds of damper layout schemes are preset.(2)The autoregressive model of linear filtering method is selected,and according to the random vibration theory,MATLAB programming based on AR model,Obtain the time history data of the pulsating wind acting on the high-rise building structure,Analyze and compare the dynamic response of the original structure under wind time history load and the structure under damper control.Verify the anti-wind effect of floor damper,and compare three schemes to get the best one.Based on the best solution,The general law of wind-induced vibration control of damper with mass ratio is studied.(3)According to the seismic code,three seismic waves are selected to analyze the dynamic response of the original structure and the structure under the control of the damper under the earthquake excitation.The general rule of anti-seismic effect and control effect of floor damper is verified,and the best scheme among the three schemes is obtained.based on this,The general rule of seismic control action of mass ratio damper is studied.(4)By analyzing the influence of the damper’s arrangement position and mass ratio on its vibration control effect,It is found that for such high-rise steel frame structures with large cantilevers on the top,The damper is arranged on the outside of the top floor of the structure.And increase the mass ratio of the damper appropriately,It can effectively improve the vibration control effect of the damper.Using the laws of research,Optimize the design of the structural damper,The results verify the accuracy of the law obtained by the analysis,It can provide reference for the design and layout of similar high-rise steel frame structure TMD in the future.