The buildings of a thermal power plant are generally supported by a large number of piles. When conducting a dynamic analysis of such buildings, the dynamic interaction system of a pile groupshould be evaluated. In this paper, the interaction system is proposed for the responses of the thermal power plant buildings subjected to earthquake excitation. The system is based on the simplified methods currently proposed by the authors, for the impedances of a pile group. The results of the analysis show that the interaction system is practical for the dynamic analysis of a building supported on a large number of piles.
