Research On Lateral Stiffness Of High-rise Diagrid Tube Structures Based On Modular Method

With the economic development and prosperity,to satisfy the need of construction industry,modern architecture is more strict to structure height and shape,which prompting some of the new building structure system to appear.High-rise diagrid tube structure is a new type of high-rise structure system.It has strong lateral stiffness and flexible arrangement of plane layout,which can high efficiency to achieve a variety of beautiful architectural modeling,and meet the pursuit of height and beauty in modern high-rise construction.Thus diagrid structure is widely used in modern high-rise construction.At present,the lateral stiffness of rectangular diagrid tube structures is studied by many researchers,but it seldom attracts attention for arbitrary polygonal ones.Therefore,it is necessary to propose a calculation model for lateral stiffness of arbitrary polygonal diagrid tube structures.First,the basic concept of modular method used in diagrid structures is defined.Diagrid structures could be divided into several modules along the height direction,then based on module research on diagrid structure is carried out.Assuming that diagonals are only subjected to axial force,a calculation model of lateral stiffness of arbitrary polygonal diagrid tube structures is presented.The lateral displacements of structures are calculated by modular method.Then the accuracy of modular method and calculation model of lateral stiffness are verified by finite element method.By using finite element method the parameter analysis is carried out,the influence of bending moment at end of diagonals,the rigid floor assumption and the number of modules on calculation results by modular method are discussed.Taking the top displacement of structures as the reference index and based on the principle of equivalent material,diagonal angle optimization method is proposed,whose rationality is validated by finite element method.Based on the design method of top displacement control,preliminary design method of cross section of diagonals is suggested.Results in this paper are expected to provide a theoretical reference for preliminary engineering design...