Seismic Response Analysis Of High-deck Wood Structure In Ancient Buildings Considering Soil-structure Dynamic Interaction

China's ancient wooden structure in the ancient architecture of the world occupies a very important position,its seismic performance analysis and research has great historical and practical value.For a long time,the structure of the ancient structure of the wood structure of the seismic analysis are used rigid foundation assumptions,in the calculation only consider the upper structure,the free surface response as a ground motion input structure.Although this method is easy to handle,the model is simple and easy to calculate,but the seismic response of this model is different from that of the actual structure.To Xi'an East Gate tower as the background,in this paper,Using APYS language of ANSYS to establish four different calculation and analysis models and analyzes modal analysis and dynamic time history analysis of four models.The soil-structure dynamic interaction is applied to the upper wood structure The dynamic characteristics,the deformation characteristics and the internal force response of the structure.The concept of soil-structure dynamic interaction is introduced,and the research results of soil-structure dynamic interaction in recent years are summarized.Based on the theory of one-dimensional repetitive fluctuation,the SHAKE91 program is used to analyze the free-field vibration inversion,and the acceleration,stress and strain of the lower soil layers are obtained by using the one-dimensional idealized model of homogeneous half-space level stratified soil.The results show that the ground motion at the bedrock propagates to the surface when the wave pattern changes little but the amplitude increases greatly.The high frequency component of the seismic wave decreases and the low frequency component becomes richer,indicating that the soil has the Filtering and amplification.In general,the acceleration time is obtained by continuous integration of the acceleration waveform,but in fact,the displacement of the displacement baseline occurs in the direct integration,and the Fortran program pair is prepared according to the basic principle of the least squares velocity time domain correction method Speed and displacement curve to adjust,get a more satisfactory results.Four kinds of calculation and analysis models of the East Gate of Xi'an are established,and the model is analyzed by modal analysis,response spectrum analysis and dynamic time history analysis.The results of modal analysis show that the natural frequency and mode of the structure are greatly changed when the dynamic interaction between the soil and the structure is taken into account,and the natural frequency of the structure is different Reduce the structure of some of the appearance of the order has also undergone a certain change.The results of response spectrum analysis and dynamic time history analysis show that the absolute acceleration of the upper structure of the rigid base model,the displacement of the column and the shear force of each layer are more rigid than the rigid foundation after considering the dynamic interaction of the soil-structure The acceleration of the superstructure is slightly lower than that of the rigid substrate,And it is still larger than the rigid foundation model under Taft wave and Lanzhou wave excitation.The relative column displacement and the shear force of each layer are the basis of the rigid base model.On the increase.The results of the analysis and calculation show that for the High Pedestal Ancient Timber Building,the upper wood structure,the foundation,the lower part of the foundation soil is a unified whole,the interaction between the three.In the analysis of seismic response,we must consider the influence of soil-structure dynamic interaction and select the appropriate ground motion input mode to ensure the correctness of the analysis results.