Effect Of Different Connection Modes Of Diagrid Joints On Seismic Performance Of Diagrid Tube Structure In High-rise Buildings

Most of the studies on diagrid tube structure in high-rise buildings at home and abroad are based on the ideal condition that diagrid joints are rigid joint,however,in the construction process,the complex construction of diagrid joints caused by diagrid angle and component cross-section is easy to cause defects at the diagrid joints.In practical projects,different connection modes of diagrid joints are usually used to solve the construction difficulties.Therefore,it is very important to study the connection modes of different diagrid joints for the construction convenience of diagrid tube structure in high-rise buildings.Diagrid joints play an important role in connecting oblique columns and ring beams as a whole.Therefore,this paper focuses on systematically studying the effects of different connection modes of diagrid joints on the overall performance of diagrid tube structure in high-rise buildings.In this paper,the connection mode of diagrid joints is the main research object,and the following aspects are studied:1.The finite element software SAP2000 is used to make a comparative analysis of four different connection modes of diagrid joints,such as rigid joints and articulated joints.By applying vertical and lateral inverted triangular loads to the structural model,it is concluded that the articulation of ring beams has little effect on the vertical and lateral deformation of the structure,and the articulation of oblique columns has little effect on the vertical and lateral deformation of the structure.It is preliminarily concluded that the main ring beam structure layer belongs to large stiffness variation of diagrid tube structure in high-rise buildings,and the structural slab has great restraint effect on structural deformation under different diagrid joint connection modes.2.The finite element software SAP2000 is used to establish the diagrid tube structure model of high-rise buildings with quadrilateral,hexagonal and dodecagonal plane forms and full ring beam,no main ring beam and inclined ring beam as elevation forms.The results show that under the same conditions,the closer the plane form is to the circle,the greater the lateral stiffness is.When the elevation form is full-ring beam,the lateral stiffness of the structure is larger.When the inclined ring beam is inclined,the lateral stiffness of thestructure is smaller.When the plane form is quadrilateral and the elevation form is inclined ring beam,the articulation of the diagrid joint has greater influence on the stiffness of the whole diagrid tube structure of high-rise buildings.3.Using finite element software SAP2000,seismic response spectrum analysis and Pushover condition analysis of diagrid tube structure of high-rise building with different diagrid joints are carried out.Compared with the analysis results of diagrid joints under rigid joints,ring beam hinges,inclined column hinges and fully hinged joints,the overall lateral displacement,inter-story displacement,inter-story shear force and plastic hinges of the structure are analyzed.Through comparative analysis,it is concluded that both rigid joints and articulated joints bear more seismic shear,which can improve the overall safety reserve of the structure,and under the action of overthrow,the diagrid tube structure of high-rise buildings has undergone brittle damage;in a word,in terms of structural strength,structural stiffness and other aspects,under different diagrid joints connection modes have been built.The diagrid tube structure of high-rise buildings can meet the seismic requirements of the structure,but when the diagrid joints are rigidly jointed,the structure has better seismic performance.