Study On Optimal Control Of Plane Irregular Adjacent Structures Based On New Inertia Damper

As a practical place to meet people’s daily life and production,the importance of architecture is also divided according to the nature of use.In order to ensure the applicability and durability of building structures,the design of building structures is often biased towards rules and safety,but with the development of the construction industry,unique and irregular structures have gradually become a trend.therefore,the design requirements of building structures are also gradually improving.In irregular high-rise buildings,adjacent structures have gradually developed as a relatively new architectural form.The design of the building structure that combines adjacent and irregular structures will be more difficult,and the design of different kinds of adjacent structures and different forms of irregular conditions will also have strong pertinence.Therefore,the uncertainty of torsion will bring great difficulties to the structural design of plane irregular adjacent structures.As a common natural disaster,earthquake will damage the stability of building structure.for irregular adjacent structures,the damage caused by earthquake is more serious than that of regular structures.Therefore,the design of irregular adjacent building structures is often difficult to meet the building seismic design indicators,but with the development of building seismic science,an effective solution can be obtained.Nowadays,the more common method of structural vibration control is to add dampers inside the structure to effectively control the structural vibration through the energy dissipation and deformation capacity of the damper itself.After years of practical verification,this method has become a generally accepted structural vibration control strategy.However,for irregular adjacent structures,it is difficult to effectively control the coupling dynamic response of the structure by adding dampers inside the structure.at the same time,the traditional mass damper is also difficult to be used in adjacent structures because of its additional mass limitation.Compared with the traditional mass damper,the new electromagnetic inertia damper(Electromagnetic Inertial Mass Damper,EIMD),as a new type of semi-active control device,has the characteristics of small size,light weight,large output and convenient installation,so it is more and more used in the vibration control of building structures.In view of the many characteristics of the new inertia damper,the research on the vibration control strategy of the new inertia damper applied to plane irregular adjacent structures is an effective way to solve the vibration control problem of adjacent structures.In this paper,a two-system control strategy based on a new type of inertia damper is proposed,that is,by adding a damper between the irregular main structure and the adjacent structure,while effectively controlling the torsion of the plane irregular main structure,the horizontal dynamic response of the adjacent structure is effectively controlled and the torsional response has no magnifying trend.Combined with the existing engineering examples,this paper studies the optimal control strategy of typical irregular adjacent structures based on a new electromagnetic inertia damper.The main research results are as follows:(1)By using the large-scale finite element software,the simulation model of the adjacent structure with eleven stories of the main structure and four stories of the podium structure is established,the structural quality and stiffness data of the model are extracted,the eccentricity of each floor of the model is analyzed,and the irregularity of the structure is divided.the results show that the main structure is a plane irregular structure with weak layer,and the skirt structure is a regular structure with unidirectional eccentricity.(2)Based on the principle of structural dynamics,the coupled dynamic equations of adjacent structures are established,and the horizontal dynamic responses in two directions and their coupled torsional dynamic responses are taken into account.By adding Taft seismic waves,the dynamic response of the structure under bi-directional ground motion is analyzed on the premise of considering horizontal and torsional coupling.The dynamic response of the structure is simulated and analyzed by Newmark-β integral iteration method in MATLAB space.The results show that the torsional response of the part below the weak layer of the plane irregular main structure is more prominent,and the torsional response of the podium structure is less prominent than that of the main structure.(3)According to the output characteristics and mechanical model of EIMD damper,a two-system control strategy based on EIMD damper is proposed.Under the premise of determining the damping coefficient,the influence of EIMD additional inertia mass,that is,inertia-mass ratio,on structural dynamic response is studied.Genetic algorithm is used to optimize the dynamic response of the structure under different inertia-mass ratio,and the optimal inertia-mass ratio of EIMD damper is obtained on the premise of torsion control.(4)In view of the disadvantage that the output of EIMD damper can not be adjusted by passive control,the optimal active control force of the structure is analyzed by LQR active control algorithm.According to the maximum hysteretic capacity of different types of EIMD damper,the upper limit of EIMD parameters is designed as a reference to ensure the normal operation of the damper.The optimal semi-active control force under different types of EIMD damper is obtained by adjusting the damping coefficient of the damper.An optimal semi-active control strategy for EIMD-plane irregular adjacent structures based on LQR active control algorithm is proposed.The effectiveness of the optimal semi-active control is verified by comparing the damping effect of passive control.(5)Considering that it is uneconomical to install too many sensors in practical engineering,and in view of the advantage that LQG active control algorithm combines economy with practicability,an optimal semi-active control strategy for EIMD-plane irregular adjacent structure based on LQG algorithm is proposed.The strategy optimizes the layout of sensors and considers the influence of external noise on structural dynamic response identification.Through analysis,it is concluded that the effect of semi-active control based on LQG algorithm is close to that of semi-active control based on LQR algorithm.