Research On Performance Control Of Tuned Damper Based On Inerter For Base Isolation Structure

This article mainly aims at the large number of masses and long strokes in the traditional TMD damping scheme,and proposes a solution based on the inertial capacity of the tuned damper.That is,the inertial container is used to try to replace the huge mass and long-stroke mass in the traditional energy-consuming device,and the inertial container,spring,and damper components form three inertial capacity systems of TID,TVMD,and TID through different series and parallel connections.This new type of shock absorption system based on inertia is becoming a new direction in the field of civil engineering structural control research.In the process of studying the vibration damping（seismic）performance of a new type of tuned damper based on inertial capacitance,this paper uses methods such as theoretical derivation,numerical simulation,and numerical analysis,and draws corresponding conclusions.Chapter 2 uses the ground motion time history analysis method to analyze the peak response displacement and the cumulative amount of response displacement of the base isolation structure of the additional（clutch）inertia container,and explore the seismic performance of the additional inertia container of the base isolation structure and obtain Conclusion:（1）Both the inertia container and the clutch inertia container can reduce the displacement response of the isolation layer,and the clutch inertia container has a better effect.（2）The larger the value of the inertia-mass ratio coefficient?,the more the displacement response of the seismic isolation layer decreases.（3）The displacement response of the superstructure is only reduced under low-frequency ground motions,and the reduction under near-site vibrations is more than that under far-site vibrations,and when the inertia-to-mass ratio coefficient?exceeds a certain value After the value,the displacement response of the superstructure will increase.（4）Compared with the peak value of the reaction displacement,the cumulative amount of reaction displacement decreases more obviously.Chapter 3 takes a two-degree-of-freedom base isolation structure as the basic system,and adds ISD,TID,and TVMD to the structural isolation layer to form a three-degree-of-freedom structural mechanics model and conduct parameter research on this.Given the basic parameters,the control effects of several tuned dampers on the superstructure acceleration are compared,and it is found that the TID has the best limitation on the superstructure acceleration within a reasonable control range.On this basis,the parameter inertial capacity mass ratio r_Z,opt is used as an independent variable,and the horizontal displacement of the base isolation structure,the horizontal displacement of the superstructure and the acceleration of the superstructure are used as the objective functions,and the built-in non-linear optimization function fmincon of Matlab is used to solve the optimal combined parameters.(β_opt ,λ_D,opt),and finally obtain the optimal solution of the parameters under the single objective(r_Z,opt,β_opt ,λ_D,opt).It is found that when the horizontal displacement of the seismic isolation layer is used as the objective function,the basic seismic isolation structure model with TVMD is the best,and it is found that the inertial capacity-to-mass ratio of TVMD has little effect,so it can be selected flexibly according to the actual situation.When the horizontal displacement of the upper structure and the acceleration of the upper structure are the objective functions,the performance of the base isolation structure model with TID is slightly better than ISD and far better than TVMD.In this case,the optimal parameter solution of TID(r_Z,opt,β_opt ,λ_D,opt)are（0.17,0.20,0.06）.Chapter 4 uses the optimization method based on performance requirements to pre-determine the target value of the horizontal displacement response of the seismic isolation layer as a constraint condition according to the performance requirements,and optimizes the absolute acceleration response of the superstructure to the minimum,that is,transforms the multi-objective optimization into a constrained Single objective optimization problem.It turns out that under the prescribed optimization criteria,ISD and TVMD will undergo system changes.Especially for ISD,under the basic control target α﹤0.8,namely the reduction coefficient of horizontal displacement of the seismic isolation layer,the inertial capacity-spring-damping series system of ISD does not exist at all,and its stiffness components will degenerate,causing its system to become inertial.The capacitance-damping series system,and when the reduction factor α﹤0.472 is further reduced,the inertial capacitance element will also degrade,causing the ISD system to become a single damper element,that is,LVD.As for TVMD,when is α﹤0.553,the stiffness element will be degraded,and the TVMD system becomes a parallel system of inertia capacity-damping.This proves again the superiority of TID for structural vibration control.On this basis,when the reduction factor α=0.677 is obtained,the optimal acceleration of the superstructure takes the minimum value（?）=0.712=0.712,and the corresponding(r_Z,opt,β_opt ,λ_{D,o pt})=（0.83,0.39,0.35）.