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设置人工边界是采用3D有限元技术实现复杂地基抗震分析的有效手段。采用Fortran语言开发大型有限元程序ANSYS的接口程序,实现粘弹性人工边界的设置及等效荷载的施加。采用经典数值算例对粘弹性人工边界及波动输入程序的可用性进行验证,其求解效率和计算精度均较理想。将该方法和程序应用到核电场复杂地基动力阻抗分析中,并将计算结果与成熟的通用程序计算结果进行对比。
Setting the artificial boundary is an effective method to realize the seismic analysis of complex foundations with 3D finite element method. Using Fortran language to develop a large finite element program ANSYS interface program to achieve the establishment of viscoelastic artificial boundary and the application of equivalent load. The classical numerical examples are used to verify the usability of the viscoelastic artificial boundary and fluctuating input program. The solving efficiency and calculating accuracy are all satisfactory. The method and program are applied to the dynamic impedance analysis of complex foundations in nuclear power plants. The calculated results are compared with the results of mature generalized programs.