Research On Shock Absorption Control Of Eccentric Seismic Isolation Structure Based On Magnetorheological Damper

The earthquake action will bring damage to the building structure and seriously threaten the safety of people’s lives and property.Structural base isolation technology is a widely used technology However,in the base-isolated structure,the displacement response of the base-isolated layer is large under seismic excitation,which seriously affects the stability of the building structure and destroys the seismic performance of the structure.In this paper,magnetorheological dampers are proposed to be used as shock absorption devices.On the basis of proportional-integral control algorithm,neural network control algorithm is proposed to optimize and apply to the Benchmark structure for analysis.The main research contents are as follows:(1)The eight-story Benchmark eccentric isolation structure is taken as the research model,The structural motion equation of the aseismic structural model under the action of seismic load is established,and the structural analysis program is compiled using MATLAB.Select eight seismic waves and draw the seismic response spectrum.(2)Based on the proportional-integral-derivative(PID)control algorithm,a PID control algorithm based on neural network optimization is proposed and applied to the structural model,and the corresponding program is established for simulation analysis.(3)The seismic isolation structure model is set under different working conditions,the dynamic response of the Benchmark structure model under different seismic actions is analyzed and compared,and the optimal damper layout scheme is analyzed.The results show that under the action of the proposed PID control algorithm based on neural network optimization,the displacement and acceleration response of the seismic isolation layer and the superstructure are well controlled,which improves the seismic resistance of the eccentric seismic isolation structure,athe magnetorheological damper is arranged close to the center of mass of the building structure,and the shock absorption effect of the control system will be more obvious.