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Identification of dynamic properties of dams using system identification techniques and real earthquake excitations

Bakhshi, A ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. Publisher: 2010
  3. Abstract:
  4. Investigation of the dynamic characteristics of an existing structure system based on field tests is of practical significance, since it can be employed in the field of examining construction quality, validating or improving analytical finite element structural models, or conducting damage assessment. The main purpose of this study is to investigate the dynamic characteristics of dams using the seismic response data. Whereas, in the process of frequency domain identification of dam properties, frequency response function (FRF) plays the most important role, evaluating the corresponding parameters with better accuracy has always been desirable. Therefore, a comparison was made between some modified methods of calculating the FRF to reduce its variance. Furthermore, a software is introduced which is able to use all of these methods plus an Auto-Regressive model in order to calculate Power Spectral Density (PSD) of input and output data separately so that, modal parameters of the system are identified. In order to validating the results of this AR model, the software is employed to identify dynamic characteristics of Factor building in UCLA. Later, it is also exploited to identify the dynamic properties of Shahid Rajaee concrete arch dam (which is located in the north of Iran) and compared with the prior studies
  5. Keywords:
  6. AR models ; Auto regressive models ; Concrete arch dams ; Construction quality ; Damage assessments ; Dynamic characteristics ; Dynamic property ; Earthquake excitation ; Existing structure ; Field test ; Finite Element ; Frequency response functions ; Frequency-domain identification ; Input and outputs ; Modal parameters ; Power spectral densities (PSD) ; Structural models ; System identification techniques ; Concrete construction ; Damage detection ; Engineering geology ; Frequency response ; Modal analysis ; Model structures ; Power spectral density ; Tsunamis ; Civil engineering
  7. Source: 9th US National and 10th Canadian Conference on Earthquake Engineering 2010, Including Papers from the 4th International Tsunami Symposium, Toronto, ON, 25 July 2010 through 29 July 2010 ; Volume 9 , 2010 , Pages 6985-6996 ; 9781617388446 (ISBN)