A Research On Anti-collision And Anti-falling Beam Isolation Control System

China is located between two major earthquake belts and is a country prone to earthquakes.Bridges are an important part of modern traffic engineering.The disasters caused by bridges under the action of earthquakes are fatal to the entire transportation system.The collision and falling beams between adjacent superstructures cause great damage to the bridge structure.The seismic isolation technology has proved to be an effective seismic method,which can minimize the damage of the structure,but the existing seismic isolation technology does not have clear anti-collision and anti-drop beam capabilities,so it has a It is of practical significance to study the anti-vibration and shock isolation control system of collision anti-drop beam.This paper introduces the collision and falling beam damage of the bridge superstructure;the research status of seismic isolation technology and anti-collision falling beam;the advantages of semi-active control technology based on magnetorheological damper.The vibration isolation control system with anti-collision and anti-drop beams proposed by Guo Jin et al.The main research contents are as follows:(1)Several mechanical models of the MR damper are introduced.The Spencer Phenomenological model is selected as the numerical model of the damper in this paper.A layering mechanism is introduced to the AGA algorithm combined with the particle swarm optimization algorithm.A new HAPGA algorithm is proposed to identify the parameters of the model.The parameters identification performance of SGA algorithm and AGA algorithm are compared,and corresponding conclusions are drawn: the model’s hysteresis curve is in good agreement,which can accurately describe the hysteresis performance of MR damper,and a numerical simulation model of MR damper is established in Matlab / Simulink.(2)Taking the collision between the main bridge and the approach bridge of the cable-stayed bridge as the engineering background,a simulated collision model was established in Matlab / Simulink,and the anti-collision and anti-fall beam isolation and control system in this paper was applied to the collision model,Compared with the passive control of viscous damper and passive control of MR damper,the numerical simulation analysis was performed under three kinds of seismic wave excitation.The results show that the semi-active control system of anti-collision and anti-fall beam isolation and isolation is the most effective Good,and it has obvious anti-collision and anti-falling beam effects under different seismic waves.(3)In order to further verify the effectiveness of the semi-active control system for anti-collision and anti-falling beam isolation,the semi-active control algorithm for anti-collision and anti-falling beam isolation and Bang-Bang control and fuzzy control under three kinds of seismic waves The numerical simulation analysis is performed,and the results show that the effect of Bang-Bang control is slightly better than the control of this paper under the excitation of Taft wave,and the effect of fuzzy control is the worst.It is best to further illustrate the effectiveness of the anti-collision and anti-falling beam vibration reduction control in this paper.It provides a preliminary theoretical basis for the application of the anti-collision and anti-falling beam isolation and isolation control system in this paper to the isolation and isolation control between the main bridge and the approach bridge of a cable-stayed bridge.