Simulation And Analysis On Interaction Of Superstructure-Raft Foundation-Soil Under Seismic Effect

To be an abrupt natural disaster, the earthquake makes vast damage to human community. Improving the resistance to vibration of buildings is important to our lifes.Traditional anti-seismic design method often assumed that the ground is rigid and only analyzed the dynamic characteristic and dynamic respond of the superstructure. However, superstructure, base and foundation are an organic whole which connect and influence each other, If people detach them individually, sometimes it will bring a distortion result of earthquake response. So, it is significant to research the dynamic interaction on superstructure-base-foundation system in project.Basing on the domestic and foreign correlation theories and method, synthesized the related literature material, the author do several aspect research on dynamic interaction of superstructure-raft foundation-soil under seismic effect as follows:(1) In this paper, the author described and summarized the basic principle of structure of power interaction, research methods as well as the research historical present situation of Soil Structure Dynamic Interaction (SSDI) thus analyzed and obtained the construction model of the various part of superstructure-raft foundation-soil and some comments, which provides a good theoretical foundation for the coming research.(2) The free field seismic response analysis was conducted. In the analysis, some parameters determination were summarized comprehensively and detailed. for example, unit selection,soil border simulation,seismic input method, meshing size ,damping and so on.(3)The three dimensional numerical analysis model of superstructure- raft foundation-soil was established by using ANSYS FEM.when in the common and strong earthquake, the dynamic characteristics and earthquake response were studied between three part of them under different research model,for example,under different foundation rigidity, different base rigidity and different superstructure rigidity and so on.The results were compared with those of the superstructure on rigid foundation.The conclusions can be used for the anti-seismic design of structure.