Application of dynamic sub-structuring method in the analysis of foundation vibration caused by metro train

A dynamic model for the tunnel-ground coupling system was established,using the fixed-interface component mode synthesis combining with the dynamic substructure method in the ANSYS software,to analyze the dynamic responses of the tunnel and the ground surface due to the metro train load.The accuracy of the dynamic substructure method was validated by comparing with the whole finite element model.The relationship between the number of the normal mode truncation and the analysis frequency in the fixed-interface component mode synthesis was discussed.In addition,the issue of the artificial boundary application was explored in the ground sub-structuring model.The computational results prove that the fixed-interface component mode synthesis can significantly reduce the computational efforts,shorten the calculation time,reduce the storage space,and hence can be used to analyze the subway environment vibration.