Research On NES Damping Control System Of Roof Based On RC Frame Structure

Currently structure passive control technology become an important technical means to reduce structural vibration,reduce structural deformation,and satisfy structural safety.Nonlinear Energy Sink(NES)is a very important form of shock absorption in the recently developed passively-tuned shock-absorbing control.Because of its nonlinear cubic stiffness,it can realize wide-band control and has wide application prospects.In this paper,based on a new type of NES damping control system for roof,the shaking table test of five-story RC frame structure model with NES damping control system for roof is studied.The main research contents include:Firstly,based on the reinforced concrete fasting sandwich plate and using its structural features,the NES shock absorber was installed in the open sandwich panel structure to design a new type of roof NES damping control system,and the NES damper was subjected to stiffness and damping.Ratio,frequency and quality parameters design and modal testing.Secondly,using the earthquake-simulated similarity law,a five-story NES shock-absorbing RC frame structure model with a seismic fortification intensity of 7 degrees was designed according to the ratio of 1:4.Earthquake simulation shaking table test of the model structure,acquisition of seismic response data and analysis,by examining the seismic performance of NES shock absorption RC frame structural model to test the damping effect of the NES damping control system of the roof.Thirdly,the ABAQUS finite element analysis software was used to simulate and analyze the shock absorption effect of the NES shock absorption control system and the seismic performance of the NES shock absorption frame model structure.In the conclusion part，the analysis and research of the full text are combed and summarized,and the further research in the future is briefly discussed.The results of this paper show that:Firstly,NES damper frequency test the frequency control range of each working condition completely covers the first order natural vibration frequency in the modal test after the end of each working condition of the seismic simulation shaking table test,which proves that the RC frame structure is in multiple main shocks.After the aftershocks,the roof NES damping control system still maintains a good shock absorption effect.Secondly,the RC frame structure of the NES damping control system for the roof of the installation roof has the maximum acceleration rate of 47.06%,the maximum dynamic magnification factor reduction rate of 42.25%,the maximum displacement rate of 24.30%,and the failure mode is the overall translational damage.Thirdly,the ABAQUS finite element simulation of the roof NES damping control system RC frame structure maximum acceleration difference rate of 17.95%,the maximum displacement difference rate of 13.69%.The earthquake simulation shaking table test verifies the correctness of the finite element simulation method.The research results of this dissertation provide technical basis for promoting the progress of passive control technology of structure and application of NES tuning damping system and have practical application significance for the development of seismic technology of structure advancement.