Seismic Vulnerability Analysis Of Diagrid Structure Of High Building Based On Incremental Dynamic Analysis Method

Earthquake disasters have caused great losses to human life and property,with the frequent occurrence of earthquake disasters in recent years,the requirements for high-rise buildings have gradually increased.Researchers have found that the diagrid structure subjected to horizontal loads works better.The diagrid structure is less widely used in engineering practice than frame structure,and the theoretical research depth of the diagrid structure is far less than that of frame structure.Most of the comparative studies on the two structures are static research and static elastic-plastic research.The real internal force of the structure under earthquake time history couldn't be calculated through static research,while the real response of the structure under random earthquake waves couldn't be reflected through static elastic-plastic research.In this paper,incremental dynamic analysis method is used to select sufficient number of earthquakes to make a comprehensive and accurate seismic performance evaluation of the structure.On this basis,the vulnerability curve of the structure is drawn to predict the probability of different limit states under the action of future earthquakes,the following aspects are mainly studied:1.The traditional frame structure and the diagrid structure with similar steel content are established.Through the analysis of vertical static load and elastic response spectrum,it is showed that the diagrid structure has smaller vertical stiffness and larger lateral stiffness than the orthogonal structure.2.Based on the established finite element model,a certain number of seismic waves are selected,through nonlinear dynamic time history analysis and incremental dynamic analysis of the two structures,it is showed that the diagrid structure has better overall spatial performance and better seismic performance than the orthogonal structure.3.Based on the results of nonlinear dynamic analysis of the two structures in the previous part,the seismic probabilistic demand model equation is established,the different failure limit states of the structures are defined,the damage degree of the structures under different earthquake intensities is analyzed,it is showed that the failure probability of the diagrid structure is smaller than that of orthogonal structure under the same earthquake intensity.