Operational experience with the tubular-space structure designed by the Moscow Architectural Institute for the machine gallery at the Sayano-Shushenskoe hydroelectric power plant

Conclusions

• 1. In designing heavy-duty high-head hydraulic facilities, where significant hydrodynamic effects on elements of the hydraulic facility should be expected during operation of dummy spillways and units, it is necessary to perform their dynamic calculation.

• 2. The MARCHI-designed superstructure of the machine gallery at the Sayano-Shushenskoe hydroelectric power plant is subject to rather vigorous vibrations due, in particular, to the operation of the dam's spillways. Nontraditional structural solutions with respect to the installation of dynamic dampers, which may be adopted after appropriate computational and field investigations, are required for this structure to lower the swings of the oscillations.

• 3. Development of maximum oscillations in strictly defined areas occurs not as a result of different stiffnesses of the components of the superstructure of the machine gallery at the Sayano-Shushenskoe hydroelectric plant or the stiffness of the reinforced-concrete unit blocks, but most likely due to the mutual effect of various elements of the hydraulic facility as sources of wave oscillations that develop due to the effect of hydrodynamic forces during idle discharges on the toe basin.