Health monitoring of a concrete arch dam using an effective hybrid method based on frequency domain decomposition and wavelet transform

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Damadipour Majid; TARINEJAD ALIREZA

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Journal: Modares Mechanical Engineering Year:2018 | Volume:18 | Issue:4 Page(s): 99-109

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Title

Health monitoring of a concrete arch dam using an effective hybrid method based on frequency domain decomposition and wavelet transform

Author(s)

Damadipour Majid | TARINEJAD ALIREZA | Issue Writer Certificate

Keywords

Operational modal analysisQ2

Ambient vibration testQ1

Frequency domain decompositionQ1

Wavelet transformQ2

Structural health monitoringQ1

Abstract

Operational modal analysis (OMA), as a branch of the system identification, plays a very important and practical role in determining the dynamic characteristics of the structures. In the operational approach that is implemented based on the Ambient vibration test, the ambient and operation loads are considered as the excitation source of the structure. In the present research, the health monitoring of a concrete arch dam is done using the modal identification of the structural system based on an integrative method composed of Frequency domain decomposition and Wavelet transform, called FDD-WT method. In the integrative method that is proposed to eliminate the shortcomings of the FDD method in determining the damping values, the spectrum of the first singular value obtained from the single frequency signals extracted from the Wavelet transform of the correlation functions of the vibrational responses is used to determine the damping values. In this paper, Pacoima arch dam is selected as the case study and the seismic records related to 1994 Northridge, 2001 San Fernando and 2008 Chino Hills earthquakes are also used to evaluate the dynamic characteristics and Structural health monitoring during the period between 1994 to 2008. In addition, the Wavelet transform of the seismic responses is also calculated in order to verify the results and to evaluate the time and frequency position of the system modes during the above-mentioned earthquakes. Investigation of changes in the natural frequencies of the structure indicates that the dam had taken serious damage during 1994 Northridge earthquake (about the fourth second), while the vibrations of the concrete structure has been almost linear during the first 4 seconds of the earthquake and also in 2001 and 2008 earthquakes.

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APA: Copy

Damadipour, Majid, & TARINEJAD, ALIREZA. (2018). Health monitoring of a concrete arch dam using an effective hybrid method based on frequency domain decomposition and wavelet transform. MODARES MECHANICAL ENGINEERING, 18(4 ), 99-109. SID. https://sid.ir/paper/179481/en

Vancouver: Copy

Damadipour Majid, TARINEJAD ALIREZA. Health monitoring of a concrete arch dam using an effective hybrid method based on frequency domain decomposition and wavelet transform. MODARES MECHANICAL ENGINEERING[Internet]. 2018;18(4 ):99-109. Available from: https://sid.ir/paper/179481/en

IEEE: Copy

Majid Damadipour, and ALIREZA TARINEJAD, “Health monitoring of a concrete arch dam using an effective hybrid method based on frequency domain decomposition and wavelet transform,” MODARES MECHANICAL ENGINEERING, vol. 18, no. 4 , pp. 99–109, 2018, [Online]. Available: https://sid.ir/paper/179481/en

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