Giant - System Of Sub-control Structures

The super tall building will get more and more extensive application with our national economy and society fast development and the increment of the population density of city, therefore, it is necessary to taking careful research on the reasonable structural form of super tall building and the method which could exactly calculate the dynamic respond of this system.Mega-sub controlled systems is a kind of ideal super tall building structure configuration; it appears with the development of the structural engineering and the control theory, synthesizing the special form of Mega frame structures which is made up of two classes frames and the basic thought of the control theory, engineers create the Mega-sub controlled systems.This paper takes work on the theoretic deduction, numerical analysis,and parameter optimization to study the Mega-sub controlled structures. Using the conclusion, a reformative structural form is introduced, it is named the Modified mega-sub controlled systems in this paper.This paper uses of the actual mechanics model, cantilever flexural rigidity is adopted in the mega structure, however shearing rigidity in the sub structure. Based on the complex mode theory, this paper gains the expression of dynamical response of the system under the non-stationary seism load,based the model of municipal No. 1 building of Tokyo City and analyses the affection of the main parameters (rigidity,damping and damper) on the Mega-sub controlled systemes. The results indicate that the rational rigidity of the sub structure can control the deformation and acceleration of the Mega-sub controlled systems perfectly,thus enhances the structure the security.In order to improve the great span characteristic of mega girder,setup the partial columns in between the coping of sub structure and the mega girder, thus the Modified mega-sub controlled systems is created. Through numerical calculation,the modified systems and the original mega-sub controlled systems can control the seism response of the main structure and the sub-structure,under the different sub structure rigidity,the modified systems reduced the scope of extremum.Therefore the modified structure not only further enhanced the structure security,also reduced difficulty in the structural engineering.So the mega-sub controlled systems is a kind of ideal super tall building structure configuration,it will have the broad prospects for development.