Seismic Performance Of High-rise Diagrid Tube Structures With Replaceable Coupling Beams

With the advancement of art and technology,architectural aesthetics and building structures continue to develop.Diagrid tube structure has become one of the new structural systems widely used in high-rise buildings in recent years.It’s unique system of resisting lateral force brings huge lateral stiffness,but also leads to disadvantages such as poor ductility and weak energy consumption.There are relatively few studies on energy dissipation measures,and the improvement of seismic performance for diagrid tube structures.In this paper,static pushover analysis and seismic response energy analysis of comparative models of diagrid tube structures with different replaceable coupling beam positions,relative stiffness of internal and external tubes and structural plane forms were carried out to study the influence of replaceable coupling beams on the seismic performance of diagrid tube structures.The main research contents of this paper are as follows:（1）Replaceable coupling beams were set at different positions of diagrid tube structure to form 5 comparative analysis models,and performed lateral pushover simulation calculations on the 5 models.Through the force,deformation,stiffness degradation,component yield and ductility of the structure during the pushover process,the mechanism of the replaceable coupling beams affecting the mechanical properties of diagrid tube structure was analyzed,and the reasonable placement of the replaceable coupling beams was judged.（2）In the case of reasonable arrangement of replaceable coupling beams,lateral pushover analysis and seismic response energy analysis were performed on the structural models with different plane form of the structure and the relative stiffness of internal and external tubes to study the effect of replaceable coupling beams on the ductility coefficient,seismic energy consumption and component damage of the diagrid tube structure.The results shows that the installation of replaceable coupling beams enables the diagrid-tube structures to have hysteretic energy consumption earlier under the action of an 8-degree earthquake,and the proportion of hysteretic energy consumption has been greatly increased,then,the inter-story drift on each floor and the damage degree of diagrid columns during the process of the large earthquake was reduced.When the relative stiffness of external diagrid is small or the plane form of the structure is a regular quadrilateral,the application of replaceable coupling beams is more effective to improve the ductility of the structure and reduce the damage of the diagrid column under the action of large earthquakes.