Seismic Performance Of A Novel Structural System Coupling Spring Turbogengerator Foundation With Main Building

One of important subjects in the seismic design of the heat-engine plant is to make sure that the seismic design of the main building and the related power facilities should be safe and reasonable, and thus the seismic performance of the whole structure can be improved. Currently, the isolated layout type is the main layout type of the heat-engine plant, causing that the main building and the turbogenerator foundation should be designed separately. Meanwhile, the effects of the soil-structure interaction on the whole structure are ignored. In this study, a novel structural system coupling the spring turbogengerator foundation with the main building is put forward and the seismic performance of this novel system is investigated by the numerical simulation method. The major research work and achievements in this study are as follows:(1) The whole finite element models of the coupled layout type structure and the isolated layout type structure based on soil-foundation-superstructure are established by the finite element software ANSYS. The horizontal seismic response of these models are computed using the wave input method based on the visco-elastic artifical boundary. The effects of coupling on the structural system are studyed by comparing the seismic response of these models. The results show that a series of advantages is revealed after coupling the spring turbogengerator foundation with the main building. The stiffness of the superstructure and the seismic performance of the top deck on turbogengerator foundation are enhanced. Meanwhile, the internal force of the main building frame columns is reduced and thus the safety of the whole structure can be increased greatly.(2) The free field model and the simplified model of the coupling structure, only considering the superstructure, are established. The seismic response of the free field is evaluated. Moreover, the large mass method is utilized to analyze the horizontal seismic response of the simplified model of the coupling structure with considering the site amplification effects. The effects of the soil-structure interaction are studyed by comparing the seismic response of the simplified model with the whole model. The results show that soil-structure interaction has important influences on the coupling structure, presenting that the frequency of the structure, the acceleration response of the top deck and the internal force of most of the main building frame columns are reduced. The simplified model will not always be safe for the engineering design.The findings obtained in this study can provide significant reference for the design and application of the novel coupling structural system.