Analysis And Design Of Vibration Control Of Distributed Sliding Mode Of Building Structures Under Earthquake Action

With the development of ultra-high and large volume buildings,the ability of building structures to resist earthquake and wind load is facing new challenges.How to reduce the response of building structures to earthquake is an important research topic.In the field of structure active and semi-active control,the control method generally uses the traditional "decentralized collection,centralized processing" centralized control strategy,which set up a central control processor,through distribution throughout the building structure of sensor acquisition of vibration signal,the analysis and calculation to produce control signal and sent to the CPU distribution buildings in various parts of the controller.When this centralized control is adopted in large-scale building structures,massive data will pose challenges to calculation and storage,and it is easy to cause large control time delay.The centralized control strategy based on global information can easily lead to the failure of the overall control system after the failure of individual sensors,and the stability of the control system is relatively fragile.Based on decentralized control theory of large system,decentralized control method of building structure designs substructure controller based on global stability based on local subsystem information,which is an effective way to overcome the above disadvantages of vibration control of large building structure.In recent years,the sliding mode variable structure control method has been applied to the decentralized control of building structures because it can design the stable sliding mode surface and control law independently,and when the sliding mode surface design meets the matching conditions,the sliding mode control method has better robustness to the interference and perturbation of the control system.This paper based on sliding mode control model building structure,using the variable structure control "unit vector format,California in the United States specifications(SAC)20 layer steel structure as the benchmark model,adopting the method of numerical simulation,the system analyzed the control of the selection of design parameters,the division of substructure,the distribution of the controller to control the effect and the effect of buildings is analyzed and the results decentralized robust characteristics of sliding mode control.At last,based on matlab visual design,the program of sliding mode control of building structure is developed.The main research contents and results are as follows:(1)This paper summarizes the research progress of decentralized control of building structure at home and abroad,introduces the method of sliding mode variable structure,and analyzes the establishment of decentralized model,sliding mode design and the stable control format based on "unit vector" variable structure control rate in the decentralized sliding mode control method of building structure.(2)The influence of decentralized sliding mode controller parameters on the control effect of building structure was studied.The results show that for the determined substructure division and controller layout,the influence of the control parameters of the decentralized sliding mode control system on the overall control effect of the structure is basically the same,and good control can be obtained.(3)Realize the division of different substructures of the benchmark model and analyze its decentralized control effect.Under the condition of each layer were set controller,the benchmark model substructure were divided into five layers,four layers and two layer of the division of three different forms,through numerical simulation,can be found: the division of three different ways are the floors relative displacement,velocity,floor acceleration has played a good control effect,which could be divided into two benchmark model substructure respectively layer partition way better control effect,three different classified methods of control the output size basic consistent.(4)The influence of stiffness change and floor quality change of the control system on the control effect is analyzed.The research shows that the control method proposed in this paper has better robust characteristics for the uncertainty of structural characteristics such as stiffness change and floor quality change of the control system.The control method proposed in this paper can not only meet the requirements of vibration control but also control the energy output.(5)By means of singular value decomposition,the equation of state of the control is transformed into a simplified sliding mode control,and the decentralized sliding mode control design of the building structure is realized when the controller is arranged differently.It is found that when controllers are arranged in the upper and lower interface floors of the substructures and a certain number of controllers are symmetrically arranged in the interior of the substructures,the controller still has a certain control effect on the relative displacement,speed and acceleration of the floors,although the sliding surface design cannot strictly meet the matching conditions.The results show that the reasonable controller setting at the stiffness conversion layer can improve the vibration control effect of the structure obviously.(6)Different structural parameters,different substructure division and different controller layout all involve the selection of parameters.In order to facilitate the design of decentralized sliding mode controller under different conditions,relevant design software is developed based on the visual design function of matlab.The software can change the value of different parameters,and obtain the controller interface of the structure response to the changing situation under different value conditions in real time,such as decentralized sliding mode control,linear quadratic centralized control,interlayer displacement,interlayer displacement time history,acceleration time history,control force time history and so on in the uncontrolled state.At the same time,the interface interactive system has a personalized operating graphical interface,which is convenient for the design and optimization of the controller.