Introduction to Operational Modal Analysis

Brincker, Rune; Ventura, Carlos E.

doi:10.1002/9781118535141

Cited by 491 publications

(472 citation statements)

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“…However for a system having closely spaced modes, effects of the adjacent modes would lead to erroneous identified dynamic characteristics. Therefore in this study singular values of the spectrum were computed to decompose the response spectrum into response of single degree of freedom systems where the dynamic modal characteristics could be extracted [12]. In addition, the phase of the structure's response spectrum under these excitations was obtained to distinguish the type of vibration mode, viz., bending mode or torsion mode.…”

Section: Methodsmentioning

confidence: 99%

“…When the structure is linear, its natural frequency can be determined through spectral density magnitude and phase of the seismic responses. This study partly adopted techniques proposed in [11,12] to obtain the damping factor and mode. Singular values of the seismic response spectrum were computed to separate possibly closely spaced modes.…”

Section: Introductionmentioning

confidence: 99%

“…Singular values of the seismic response spectrum were computed to separate possibly closely spaced modes. Then unlike the method proposed in [11,12], the singular values of the spectrum were transformed into the time domain to get responses of single degree of freedom systems from which damping factors could be elicited. Curve-fitting technique was employed to extract damping factor from the responses.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Characteristic Identification of Seismic-Excited Multi-Story Buildings through Response-Only Technique

Budipriyanto¹,

Suprobo²

2014

MST

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Identifying dynamic characteristics of civil engineering structures is still a challenging task. It intends to assess behavior of the structures under time-dependent loads. This paper discusses a methodology suitable for identifying the characteristics of multi-story buildings using only their measured response under earthquake ground excitations. Appropriateness of technique used for structural identification was corroborated through coherence of the structure's responses. The methodology was applied for identifying the characteristics of 14-story and 20-story office buildings located in a high seismic region. Responses of these two buildings recorded during three different seismic ground motions were investigated. The buildings' response spectral densities and singular values were computed and utilized to identify their dynamic characteristics, viz. modal frequencies, damping factors, and mode types such as bending or torsion mode. Results of this study were validated through comparisons with the results reported using different structural identification techniques. It indicated that the methodology implemented in this study was capable of identifying the dynamic characteristics of multi-story buildings using responses under seismic ground motions. Abstrak Identifikasi Karakteristik Dinamik Gedung Bertingkat dengan Menggunakan Respons Seismik dari Struktur.Identifikasi karakteristik dinamik struktur sipil bertujuan untuk mempelajari perilakunya akibat beban yang bervariasi dengan waktu. Makalah ini membahas metodologi untuk identifikasi struktur gedung bertingkat dengan hanya menggunakan respons yang diukur selama terjadi gempa. Dalam makalah ini, koherensi respons struktur digunakan untuk menjustifikasi penerapan metode yang dipakai. Metodologi tersebut diaplikasikan untuk identifikasi karakteristik dinamik (frekwensi, faktor redaman, dan ragam) struktur gedung bertingkat 14 dan 20 dengan menggunakan respons percepatan yang direkam selama tiga kejadian gempa. Hasil dari studi ini dibandingkan dengan hasil studi terdahulu yang diperoleh dengan metode yang berbeda. Hasil tersebut mengindikasikan bahwa metodologi ini mampu mengidentifikasi karakteristik dinamik struktur gedung bertingkat dengan menggunakan responsnya akibat beban gempa.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic Characteristic Identification of Seismic-Excited Multi-Story Buildings through Response-Only Technique

Budipriyanto¹,

Suprobo²

2014

MST

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“…[10,[20][21][22][23][24] For both static and dynamic SSI methods, structural responses have to be measured to provide the necessary information. However, in dynamic methods, the knowledge of the mass and the damping is also required unless full sets of modes are known or the mass scaling factor can be determined by experimental means, [14] which is not necessary for static SSI. In addition, dynamic methods require an adequate control of excitation including the elimination of spurious excitation, which was essential for precise model-shape measurement, and the resolution of measurements for dynamic response was lower than that for static response.…”

Section: Introductionmentioning

confidence: 99%

“…A comprehensive description and the associated categories of SSI are provided in the technical report of the American Society of Civil Engineers. [1] These categories include static [2][3][4][5][6][7] and dynamic excitations, [8][9][10][11][12][13][14] parametric [3,5] and non-parametric models, [8,[15][16][17] deterministic [2,[4][5][6]9,18,19] and probabilistic approaches. [10,[20][21][22][23][24] For both static and dynamic SSI methods, structural responses have to be measured to provide the necessary information.…”

Section: Introductionmentioning

confidence: 99%

Static structural system identification for beam-like structures using compatibility conditions

Lei

Coderque

2017

Struct Control Health Monit

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SummaryDue to the inevitable noise existing in the measured responses, structural system identification is often a challenging task in terms of the accuracy of the estimations. Structural system identification by the observability method, which is characterized by the analysis of null spaces, is a powerful tool to determine the observability of structural parameters. However, it did not cope well with measurement errors so far. In this paper, for the first time, functional relations among displacements, denoted by the term compatibility conditions, in beam-like structures are derived by the observability method. Then, compatibility conditions are imposed in an optimization procedure to minimize the discrepancy between the measured response and the compatible one. The compatible response obtained by the optimization is used to obtain the final estimations of the parameters. In a simply supported bridge example, the proposed method is thoroughly evaluated regarding the number of measurements, error levels, and load cases. In an example of a continuous bridge, different load cases are used to estimate the bending stiffnesses of different zones. The accuracy and the efficacy of the proposed method are verified by the numerical results.

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Linear System Identification

2024

Structural Dynamics in Engineering Design

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Introduction to Operational Modal Analysis

Cited by 491 publications

References 0 publications

Dynamic Characteristic Identification of Seismic-Excited Multi-Story Buildings through Response-Only Technique

Dynamic Characteristic Identification of Seismic-Excited Multi-Story Buildings through Response-Only Technique

Static structural system identification for beam-like structures using compatibility conditions

Linear System Identification

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