Based On The Framework Of IDA Method Considering Different Foundation Structure Seismic Vulnerability Analysis

With the development of urbanization, the population more land less problem more and more prominent. High-rise frame structure because of its flexible layout, to maximize meet the construction requirements, widely used in office, shopping malls, residential.Our country in the Pacific seismic belt, earthquakes, the survey found frame structure in different degree of damage in the earthquake. Frame structure safety, about people's life and property safety. This paper USES the incremental dynamic analysis ?IDA? seismic vulnerability analysis of frame structure.Incremental dynamic analysis of frame structures considering the influence of different foundation for structure, in this paper on rigid foundation, hard soil, soft soil foundation frame structure and the stiffness of different seismic vulnerability analysis frame structure itself.Taking the 10 tier frame structure as an example, the 3D model of the frame structure is established by using ANSYS/LS-DYNA software.. In this process, the frame structure finite element modeling theory, the soil theory, the concrete material MAT₃ model and the selection of the unit are introduced..IDA analysis of the rigid foundation frame structure, hard soil foundation frame structure, and the soft foundation frame structure is carried on, and the structural fragility curve is obtained.The results show that:?1? The same foundation model and ground motion intensity, with the increase of concrete strength, the probability of reaching IO state, LS state, the greater. The smaller the concrete strength, the more prone to the same vibration intensity of the structure and the more prone to minor damage and serious damage.?2? In the case of the same foundation, the larger the structure rigidity, the more the frame structure collapse resistance reserve coefficient..?3? When the concrete strength of the frame structures is concrete, the smaller the earthquake resistance to the collapse reserve coefficient of the foundation.?4? Through this research, we show that the seismic performance of the structure is greatly affected, and the seismic performance of the structure should be considered.?5? The seismic performance of the structure is better for the structural fragility curves and the structural collapse reserve coefficient.. The seismic and collapse studies of structures can be analyzed by using IDA method.