International Conference «Mathematical and Informational Technologies, MIT-2013»
(X Conference «Computational and Informational Technologies for Science,
Engineering and Education»)

Vrnjacka Banja, Serbia, September, 5–8, 2013

Budva, Montenegro, September, 9-14, 2013

Vorobyeva D.B.   Золотухин Е.П.   Kuzmenko A.P.  

Determination of the dynamic characteristics of the gravitational hydropower plant dam on seismometric monitoring data and using computational finite element model

Reporter: Vorobyeva D.B.

Assessment of technical condition of dams of hydroelectric power plants (HPP) is quite complex and multi-criteria technical and organizational task. The most important indicators by which it is required to diagnose the condition of hydro-technical facilities (HTF) in order to show if it is normal, potentially dangerous or pre-emergency, include the parameters of dynamic response of structures during a possible seismic event of technogeneous or natural origin that is a powerful impulse excitation of the dam.
An approach is described that has been developed for auxiliary monitoring of technical condition of hydropower plant dams. It is based on analysis of changes in dynamic characteristics of dams obtained by an automated monitoring and earthquake registration system that records microseismic vibrations of structures and was installed at the dam of Krasnoyarsk hydropower plant in 2010. The results of the system operation are described in the paper.
Were first obtained graphs of the first four natural frequencies of the dam for 2 years. The methods of determining the dynamic characteristics on the set of records obtained in the process of operation periodically in a limited number of observation points are described. Statistical models of dynamic characteristics time series were obtained taking into account the seasonal changes of the structure – the dependences of natural frequencies on the upstream water level and temperature of ambient air.
To study dynamic behavior of the dam and confirm the dependences of natural frequencies on factors of seasonal change of the structure it was proposed to develop a model of the system "dam-foundation- reservoir" with the use of the finite element method.
The calculations of the natural frequencies were performed taking into account and not the interaction of the dam with foundation and added weight of water for the different upstream water levels. The results of modal analysis are compared with the obtained dependencies of experimental data.

Abstracts file: аннотация Воробьева Д.doc

To reports list

© 1996-2019, Institute of computational technologies of SB RAS, Novosibirsk