Variation of modal parameters of a cable-stayed bridge identified from ambient vibration measurements and FE modelling

Macdonald, John H G; Daniell, Wendy E.

doi:10.1016/j.engstruct.2005.06.007

Cited by 89 publications

(36 citation statements)

References 14 publications

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“…Variations of effective damping ratios and natural frequencies with wind speed were found and some indications of aeroelastic modal coupling were identified on the partially constructed bridge (Macdonald & Daniell 2005). In other full-scale studies, Littler (1992) and Brownjohn (1994) on the Humber Bridge, Bietry et al (1994) on the Saint-Nazaire Bridge, Ge and Tanaka (2002) on the Höga Kusten Bridge during construction and Jensen et al (1999) on the Great Belt Bridge, Nagayama et al on the Hakucho Bridge all found some trends of effective aerodynamic damping with wind speed, but coupling between modes and flutter derivatives were not identified.…”

Section: Introductionmentioning

confidence: 99%

“…The primary aim of this study was to uncover details of large amplitude response that the bridge was found to produce for certain wind conditions by determining the variation of modal characteristics with wind velocity and explore the possibility for flutter instability. Modal parameter estimates from a frequency based curve fitting technique (for details see Macdonald and Daniell 2005) are used here, together with a subspace stochastic identification formulation especially modified to extract flutter derivatives (Jakobsen 1995). In this study, due to lack of wind tunnel data from a scale model, flutter derivatives of other typical bridge cross-sections, as presented by Scanlan and Tomko (1971), are used to assess potential similarities.…”

Section: The Case Studymentioning

confidence: 99%

“…Modal parameters were calculated from the acceleration Power Spectral Densities (PSDs) using the Iterative Windowed Curve-fitting Method (Macdonald and Daniell 2005), specifically developed for the analysis of ambient vibration data and allowing for the previously specified loading spectrum. The method iteratively curve fits in the frequency domain a series of windowed (performing the same window function the measured spectra employ) idealized…”

Section: Modal Analysismentioning

confidence: 99%

See 2 more Smart Citations

Identification of flutter derivatives from full-scale ambient vibration measurements of the Clifton Suspension Bridge

Nikitas¹,

Macdonald²,

Jakobsen³

2011

Wind and Structures An International Journal

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Abstract. The estimated response of large-scale engineering structures to severe wind loads is prone to modelling uncertainties that can only ultimately be assessed by full-scale testing. To this end ambient vibration data from full-scale monitoring of the historic Clifton Suspension Bridge has been analysed using a combination of a frequency domain system identification method and a more elaborate stochastic identification technique. There is evidence of incipient coupling action between the first vertical and torsional modes in strong winds, providing unique full-scale data and making this an interesting case study. Flutter derivative estimation, which has rarely previously been attempted on full-scale data, was performed to provide deeper insight into the bridge aerodynamic behaviour, identifying trends towards flutter at higher wind speeds. It is shown that, as for other early suspension bridges with bluff crosssections, single-degree-of-freedom flutter could potentially occur at wind speeds somewhat below requirements for modern designs. The analysis also demonstrates the viability of system identification techniques for extracting valuable results from full-scale data.

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Section: Introductionmentioning

confidence: 99%

Section: The Case Studymentioning

confidence: 99%

Section: Modal Analysismentioning

confidence: 99%

See 1 more Smart Citation

Identification of flutter derivatives from full-scale ambient vibration measurements of the Clifton Suspension Bridge

Nikitas¹,

Macdonald²,

Jakobsen³

2011

Wind and Structures An International Journal

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“…During the past few decades, the correlations between the vibrational characteristics and temperature changes have attracted considerable interest in technical literature and have been investigated using different approaches such as numerical analysis via finite element (FE) methods [9,10], laboratory tests [8,11], and monitoring approaches in civil structures [1,12,13].…”

Section: Shock and Vibrationmentioning

confidence: 99%

“…Macdonald and Daniell [9] performed modal analyses under two different temperature conditions using an FE model of a cable-stayed bridge with a main span of 456 m. A uniform change of 5 ∘ C in the entire structure was considered under the first condition, whereas a temperature gradient of +10 ∘ C was assumed between the top of the deck and the rest of the structure under the second condition. With regard to the FE model, beam elements and four shell elements were used to model the longitudinal girders and reinforced concrete (RC) slab of the deck, respectively.…”

Section: Shock and Vibrationmentioning

confidence: 99%

Long-Term Vibration Monitoring of the Effects of Temperature and Humidity on PC Girders with and without Fly Ash considering ASR Deterioration

Fukada

Torii

2017

Shock and Vibration

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Structural responses have been used as inputs in the evaluation procedures of civil structures for years. Apart from the degradation of a structure itself, changes in the environmental conditions affect its characteristics. For adequate maintenance, it is necessary to quantify the environment-induced changes and discriminate them from the effects due to damage. This study investigates the variation in the vibration responses of prestressed concrete (PC) girders, which were deteriorated because of the alkali-silica reaction (ASR), concerning ambient temperature and humidity. Three PC girders were exposed to outdoor weather conditions outside the laboratory, one of which had a selected amount of fly ash in its mixture to mitigate the ASR. The girders were periodically vibration tested for one and a half years. It was found that when the temperature and humidity increased, the frequencies and damping ratios decreased in proportion. No apparent variation in the mode shapes could be identified. A finite element model was proposed for numerical verification, the results of which were in good agreement with the measured changes in the natural frequencies. Moreover, the different dynamic performances of the three specimens indicated that the fly ash significantly affected the vibrations of the PC girders under ASR deterioration.

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Suspended Roof of B raga Sports Stadium, P ortugal

Cunha

Magalhães

2008

Encyclopedia of Structural Health Monitoring

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Temporary ambient vibration monitoring of the suspended roof of the new Braga Sports Stadium was developed with the purpose of identifying modal properties through operational modal analysis. This experimental work allowed the validation of a numerical modeling that takes into account the geometric nonlinear structural behavior and the progressive application of loads during the construction phase. Special attention was given for the identification of modal damping ratios, owing to the necessity of analyzing the susceptibility of the suspended roof to buffeting effects. Modal damping ratios were estimated from data provided by free, forced, and ambient vibration tests, using an improved implementation of the enhanced frequency domain method and the covariance‐driven stochastic subspace identification (SSI‐COV) method.

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Variation of modal parameters of a cable-stayed bridge identified from ambient vibration measurements and FE modelling

Cited by 89 publications

References 14 publications

Identification of flutter derivatives from full-scale ambient vibration measurements of the Clifton Suspension Bridge

Identification of flutter derivatives from full-scale ambient vibration measurements of the Clifton Suspension Bridge

Long-Term Vibration Monitoring of the Effects of Temperature and Humidity on PC Girders with and without Fly Ash considering ASR Deterioration

Suspended Roof of B raga Sports Stadium, P ortugal

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