Open AccessSeismic stability of vibration-insulated turbine foundations depending on the frequency composition of seismic impact
Author(s) -
Aleksandr E. Babsky,
Бабский Александр Евгеньевич,
Vladimir Lalin,
Лалин Владимир Владимирович,
Ilia I. Oleinikov,
Олейников Илья Игоревич,
Vladimir Aleksandrovich Tarasov,
Тарасов Владимир Александрович
Publication year - 2021
Publication title -
stroitelʹnaâ mehanika inženernyh konstrukcij i sooruženij
Language(s) - English
Resource type - Journals
eISSN - 2587-8700
pISSN - 1815-5235
DOI - 10.22363/1815-5235-2021-17-1-30-41
Subject(s) - vibration , foundation (evidence) , turbine , structural engineering , engineering , finite element method , seismic loading , seismic wave , vibration control , geology , seismology , acoustics , mechanical engineering , physics , archaeology , history
The seismic resistance of vibration-insulated turbine foundations is a complex and multifaceted problem that includes many aspects. The turbine foundation is a special building structure that unites parts of the turbine and generator unit into a single machine and it is used for static and dynamic loads accommodation. The number of designed and constructed power plants in high seismic level areas is large and steadily growing. In addition, engineers and designers deal with the issue of the frequency composition of the seismic impact influence on the seismic resistance of vibration-insulated turbine foundations. Dynamic calculations were performed in Nastran software using time history analysis and the finite element method. The main criteria for the seismic resistance of a vibration-insulated turbine foundation are the values of the maximum seismic accelerations in the axial direction at the level of the turbine installation and the values of vibration-insulated foundation maximum seismic displacements (deformations of vibration isolators). The results of the calculation experiments proved a significant effect of seismic action frequency composition on the behavior of the vibration-insulated turbine foundations. Calculations of foundations, taking into account earthquakes of the same intensity, but with different values of the prevailing frequencies of the impact, lead to the differing by several times values of the maximum seismic accelerations at the turbine level and seismic displacements.