Research On Optimization Design Of Connected Dampers In Hybrid Passive Control System

The base-isolated structure and the layer-separated seismic structure have good damping effects under normal earthquakes(such as far-field earthquakes)and high-frequency short-period earthquakes,but under long-period earthquakes with obvious displacements and velocities such as near faults.Amplify the displacement and acceleration of the upper structure of the isolation mount.The passive control system of the connected energy-consuming devices between adjacent non-isolated structures has better control effects under long-period earthquakes(such as far-field long-period earthquakes),but the damping effect is not ideal under high-frequency pulse earthquakes.Most scholars at home and abroad have studied the above two single passive control systems.With the deepening of seismic design research,some scholars have proposed combining these two passive control systems,but the research in this area is still not perfect and deep.In this paper,combined with the advantages of the isolation system and the damping system of the connected energy-consuming device,the research idea of the hybrid passive control system is proposed.The damper connected between the isolated structure and the adjacent non-isolated structure is used as the optimization design goal.The following aspects of research.The hybrid passive control system of the connected damper between the isolated structure and the non-isolated structure is introduced.The adjacent structure is simplified into a particle model,and the equation of motion of the whole structure under the vibration of white noise is derived.In order to control the vibration energy of the main structure(isolated structure)in adjacent structures as the optimization strategy,the optimization design of the damper parameters connected between adjacent structures is studied.Using MATLAB software to compile a specific numerical example analysis program,the time-step dynamic response iterative operation is performed according to the Newmark-? method principle,and the isolated structure in the single isolation structure and the hybrid passive control system is calculated in the conventional ground motion and different types.The time-dependent dynamic response of displacement and acceleration under long-period ground motions.After comparative analysis,the effectiveness of damper parameter optimization design and the superiority of hybrid passive control system to structural vibration control are proved.Based on the vibration energy strategy of the isolated main structure,the explicit expression of the damper optimization parameters is derived.Given some parameters in the hybrid passive control system,the remaining parameters are analyzed.How to influence the main structure when the mass ratio ? and the frequency ratio ? change The vibration response can also obtain the relationship between the optimization coefficient of the damper and the parameters of the adjacent structure,and can obtain the specific value of the damper optimization parameter when the vibration energy of the isolated main structure is minimum,which is the seismic design of the actual project.Provide a theoretical basis for selecting suitable damper parameters.