Study of a Steam Turbo Generator Foundation Structure under Dynamic Load on Pile Support

The steam turbo generator foundation structure is one of the most vital structures in a power plant. Turbo generator structure always stands under machine rotating dynamic load, huge dead load, live load, short circuit load, etc. Out of all, analysis of structures considering rotating load, heavy dead load, and earthquake load with soil-structure interaction is a very challenging task. So, proper analysis of the structure considering critical load conditions is very essential for the design of a foundation. In the literature review, it has been seen that most of the papers are related to the optimum solution of mass turbo generator, dynamic participation factor, code-based analysis, vibration difficulties, and numerical model of low capacity turbo generator (TG) structure on a fixed support. However, dynamic analysis of massive turbo generator structures on a group of pile support is very rare. In this case, responses of a 660MW foundation structure are analyzed under dynamic loads such as the rotating load of TG and earthquake along with the dead and live load. Modelling and analyses of the TG foundations have been done using finite element-based software. The meshing of soil has been done according to the shear wave velocity and the seismic excitation. Comparison of responses on a fixed base and pile support condition have been compared. The most critical region of the foundation is between bearing 3 and bearing 4 of TG.