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将土-结构动力相互作用问题引入到空间结构的抗震研究中,以ANSYS为上部空间结构计算平台;以FORTRAN为下部结构的计算平台,采用集中质量显式有限元和透射人工边界模拟地基无限域,建立包含土、基础、空间结构在内的整体三维模型,采用显-隐式相结合的方法进行时程分析,从而建立一种空间结构-地基动力相互作用的三维时域直接分析方法。可以采用不同的时间步距分别计算上部、下部结构,以提高计算效率;空间结构的非线性可通过较为成熟的ANSYS有限元软件进行考虑。通过集中质量模型和四点支承正放四角锥网架算例,验证了该方法的可行性和正确性。
The problem of soil-structure dynamic interaction is introduced into the seismic study of the space structure, ANSYS is used as the calculation platform of the upper space structure, the FORTRAN is used as the calculation platform of the substructure, and the explicit finite element and the transmission artificial boundary , An overall three-dimensional model including soil, foundation and space structure is established. The time-history analysis is carried out by a combination of explicit and implicit methods to establish a three-dimensional direct analysis method of time-domain interaction of space structure and foundation. Different time steps can be used to calculate the upper and lower structures, respectively, in order to improve the computational efficiency. The nonlinearity of the spatial structure can be considered by the more mature ANSYS finite element software. By focusing on the mass model and the four-point support of the quadrangular pyramid truss example, the feasibility and correctness of the method is verified.