Basic Mechanical Characteristics And Seismic Behaviours Analysis On High-rise Diagrid Tube Structures

The high-risediagrid tube structure is a new and efficient structure.Its mesh outer cylinder is made of crossed slanting pillars,and the way of passing force is more direct and effective,and it has the efficient mechanism that can take vertical and horizontal loads at the same time.However,the theoretical research of this new structural system is not deep enough and mature,and does not form a complete theoretical system.Compared with traditional structures,the application of diagrid structures is in the initial and neither has the rich engineering experience,has not experienced the strong earthquake test.The high-rise grid tube structure can provides a higher lateral stiffness,while the research of capacity of plastic energy is not thorough.In order to solve the problem of seismic theory of diagrid tube structures being behind the engineering practice,the elastic and the pushover analysis of different skew angle of the grid structures will be studied in the thesis to explore the mechanical characteristics and seismic performance of the high-rise grid tube structure.The mian works are as follows.1.The force analysis of the two-dimensional frame structure and the two-dimensional diagrid structure with different oblique angles is carried out under vertical and horizontal load.Basic concept and features of diagrid structures are introduced explicitly,and the characteristics and regularity of the internal force distribution of the diagrid structure are analyzed.research shows,the high-risediagrid tube structure mainly takes the vertical and horizontal loads in the form of axial force of the inclined column,which force characteristics and anti-lateral stiffness obviously surpass the frame structure2.The elastic analysis of the three-dimensional frame tube structure and the diagrid tube structure with different oblique angles is carried out,and the internal force distribution,the vibration sycle,the interlayer displacement angle and the floor shift are analyzed.The influence of the oblique angle,the height-to-width aspect ratio of the structure and the angle of the column on the lateral stiffness of the structure are investigated.The advantages of the stiffness of the diagrid tube structure are highlighted,and the optimal diagonal is given under the different height-to-width aspect ratio.Contrasted analysis is conducted to find the differences between the traditionalstructure and the diagrid tube structure in their seismic performances.Simultaneously,The internal force distribution of the outer tubes of diagrid tube structure under certain aspect ratio is analyzed.The distribution of shear force and overturning moment of the both inner and outer tubes under the action of load combination are introduced explicitly,and the collaborative performance of the diagrid tube structure is summarized.3.The pushover analysis of the structural model was carried out.and the structural ultimate strength,the interlayer displacement angle under the rare earthquakes and structural damage mechanism and other aspects of comparisonare analyzed.This paper summarizes the plastic development process and the order of yield of various structural models.The yield path of the diagrid tube structure is clarified.The key components of the lateral stiffness and the key components of the plastic energy dissipation are analyzed,and the influence of the oblique angle on the structure plastic development process.The advantages and disadvantages of the diagrid tube structure and the frame structure in seismic performance were compared,and some seismic suggestions are given.