Seismic Performance Of Mid-to-high-rise Diagrid Structure With/Without TIMD

At present,people’s demand for the beauty and comfort of architectural form is getting higher and higher,and the traditional form of architecture can not meet people’s needs.The diagrid structure has the characteristics of beautiful architectural form,diversified facade forms and superior overall performance of the space,etc.It has been applied by famous buildings and landmark buildings all over the world.However,there is less research on the seismic performance of diagrid structure system,In addition,the traditional seismic design method which only relies on the "hard resistance" capability of the structure itself is difficult to meet the performance requirements of the diagrid structure system under the action of different ground motion levels.and the structural vibration control technology has changed the traditional anti-seismic design concept.It is one of the important technical means to enhance the safety and function of the structure.In order to solve the problem that the theoretical research of mid-to-high-rise diagrid structure lags behind the engineering practice,This article respectively to the diagrid structure under different Angle of inclined column linear analysis,studied the structural system of diagrid mechanical properties and seismic performance,In view of the shortcomings of large dead weight and small output in the vibration control device of passive viscous mass damper widely used in practical engineering,Based on the characteristics of this kind of damper with lighter deadweight and larger output,the vibration control performance of the structure of the high-rise diagrid based on TIMD is studied.The main content is as follows:(1)The force analysis under the vertical and horizontal seismic load of the diagrid structure and multi-layer frame core barrel structure is carried out,and the ability of the diagrid structure and frame core barrel structure to resist deformation,as well as the characteristics of their respective internal force distribution,the study shows that The main internal force effect of diagrid system under vertical and horizontal seismic load is axis force,compared with the multi-layer frame core barrel structure has the advantages of good anti-side performance and direct and effective transmission path.(2)The seismic performance of the high-rise diagrid structure system is analyzed linearly,the anti-side shift ability of the different oblique column angle diagrid structure under seismic action,the proportion of the internal and external barrel stiffness distribution is analyzed,the influence of the different oblique column angle on the seismic performance of the structure is investigated,and the basic force model of the oblique mesh structure is analyzed.Put forward a principle based on the structure of bending and shear stiffness ratio,and a method for determining the optimal Angle of inclined column analysis to determine the 13 th floor from inclined column to diagrid structure optimal Angle range,analysis the earthquake under the action of different Angle of inclined column diagrid structure inside and outside the cylinder shear force and bending moment distribution characteristic,summarizes the structure of space to work performance.(3)The modal analysis of the high-rise diagrid structure is carried out,the main mode is determined by calculating the proportion of each modal displacement in the total displacement and combined with the high-level seismic design specification,the reasons for the error between the modal analysis results and the time-range analysis results are pointed out,and the selfvibration cycle,cycle ratio and damping ratio of the diagrid structure at different angles are analyzed.To investigate the effect of the angle of the non-barrel oblique column on the seismic energy consumption capacity of the structure,a method to determine the cross-sectional dimensions of the diagrid structure based on the principle of stiffness design is introduced,and the variation of the shear and bending deformation of the diagrid structure with the aspect ratio is analyzed.(4)The TIMD is introduced in two different tuning modes,including motor tuning to form electromagnetic inertial mass damper EIMD and viscous material tuning to form tuned viscous mass damper TVMD,analyzing its basic mechanical properties and working principles,optimizing the design of the relevant parameters of the damper based on the basic mechanical properties,and making clear the influence law of the equivalent mass coefficient and the equivalent damper coefficient on the mechanical properties of the damper,and arranging EIMD and TVMD respectively for the structure of the 13 th floor diagrid structure.Comparing the seismic response of the structure in the uncontrolled and controlled state,the seismic performance of EIMD and TVMD on the structure is analyzed by calculating the shock absorption rate,and the advantages and disadvantages of TIMD under different tuning methods are summarized.