Determination of stay cable force based on effective vibration length accurately estimated from multiple measurements

Chen, Chien‐Chou; Wu, Wen‐Hwa; Huang, Chung-Huei; Lai, Gwolong

doi:10.12989/sss.2013.11.4.411

Cited by 32 publications

(32 citation statements)

References 12 publications

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“…Due to the well separated modal frequencies and extremely light damping ratios (typically as low as 0.1%) of a stay cable, DFT has also been conveniently employed for identifying its mode shape ratios from the ambient vibration measurements with high-resolution velocimeters [10]. Assuming that y 1 ðtÞ; y 2 ðtÞ; .…”

Section: Determination Of Mode Shape Ratiosmentioning

confidence: 99%

“…This method is typically applied by first identifying the cable frequencies with a single vibration measurement and then using a pre-determined formula [4][5][6][7] or finite-element approach [8,9] to estimate the tension. Recently, an innovative concept of combining the mode shape ratios together with the modal frequencies was proposed by the authors to develop a convenient and accurate method for the determination of stay cable force [10]. Multiple synchronized vibration signals of a stay cable are required in the aforementioned study to obtain the mode shape ratios at various sensor locations for each observable mode.…”

Section: Introductionmentioning

confidence: 99%

“…These studies were emphasized on effectively obtaining the modal parameters with the signal from a single camcorder aimed at a specific position of stay cable, usually with vibration amplitude less than 1 mm. Intended to further extend the applicability of digital photogrammetry techniques, the current paper explores the feasibility of using multiple camcorders to accurately determine the mode shape ratios of stay cables for the succeeding estimation of tension with the novel method [10]. To compensate the restrictions imposed by the adoption of budget equipment, elaborate adjustments in scale, synchronization, and baselines are conducted.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Application of digital photogrammetry techniques in identifying the mode shape ratios of stay cables with multiple camcorders

Chen

Tseng

et al. 2015

Measurement

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Section: Determination Of Mode Shape Ratiosmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Application of digital photogrammetry techniques in identifying the mode shape ratios of stay cables with multiple camcorders

Chen

Tseng

et al. 2015

Measurement

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“…Currently, there are five main monitoring methods to identify and localize the cable damage during the bridge service period. First, the vibration method (VM for short) . For this method, the fundamental natural frequency of stay cable can be used to determine the cable force.…”

Section: Introductionmentioning

confidence: 99%

Localization and quantification of partial cable damage in the long-span cable-stayed bridge using the abnormal variation of temperature-induced girder deflection

Gao-xin

2018

Struct Control Health Monit

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The cable damage is one serious problem to endanger the bridge safety. Considering that current methods of estimating cable damage still have some shortcomings during their application, this paper introduced one new method to localize and quantify the partial cable damage using the abnormal variation of temperature-induced girder deflection caused by cable damage. First, the monitoring correlation between girder deflection and uniform temperature is analyzed using the monitoring temperature and deflection data. Second, the abnormal variations of temperature-induced girder deflection and cable force are deeply researched through finite element simulation. Third, the correlation between girder deflection and cable force is mechanically modeled, and furthermore, the method of localizing and quantifying partial cable damage is put forward. Specifically, the envelope curve is created to localize the broken stay cable, and the damage indicator is used to quantify the partial damage in the broken stay cable. Furthermore, the influence of two parameters (viz., the environmental noise and sensor quantity) on the localization and quantification accuracy is discussed. Overall, the results show that the proposed method is feasible to localize and quantify the partial cable damage. KEYWORDS broken stay cable, cable-stayed bridge, localization and quantification, temperature-induced cable force, temperature-induced girder deflection

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“…Conventionally, just the modal frequencies of a stay cable are required to determine its cable force with an analytical or empirical formula for assessing the health condition of the whole cable‐stayed bridge. A novel concept of incorporating the mode shape ratios of cable was recently proposed by the authors to provide an accurate estimation of cable force . The stability problem of stay cables themselves due to the effect of wind is also a very important issue in design.…”

Section: Introductionmentioning

confidence: 99%

Application of stochastic subspace identification for stay cables with an alternative stabilization diagram and hierarchical sifting process

Wang

Chen

et al. 2016

Struct. Control Health Monit.

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The modal parameters of numerous modes for a stay cable are usually required in engineering practice. The application of conventional stochastic subspace identification techniques without delicate cautions, however, has been found to be unsuccessful in this case. Aiming to attack such a difficulty, this study establishes a new methodology based on the covariance type of stochastic subspace identification for extensively identifying the modal parameters of a stay cable. Several details of choosing the parameters in performing stochastic subspace identification are first discussed. An important discovery is that the lower limit for setting the time lag parameter can be decided by the ratio of the fundamental period of cable to the sampling time increment for a valid identification with the conventional stabilization diagram. Inspired by the aforementioned criterion, an alternative stabilization diagram is further proposed to more conveniently distinguish stable modal parameters of cable. A hierarchical sifting process including three stages is then developed to systematically and automatically extract reliable modal parameters from the alternative stabilization diagram. Demonstrated by analyzing the ambient vibration measurements for three stay cables of Chi-Lu Bridge, the feasibility of this new approach is verified with successfully obtaining the modal frequencies, damping ratios, and mode shape ratios for almost all the cable modes in the examined frequency range. Another interesting finding is that the modal frequencies and damping ratios of bridge deck can also be effectively identified from the ambient vibration signals of cable.

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Determination of stay cable force based on effective vibration length accurately estimated from multiple measurements

Cited by 32 publications

References 12 publications

Application of digital photogrammetry techniques in identifying the mode shape ratios of stay cables with multiple camcorders

Application of digital photogrammetry techniques in identifying the mode shape ratios of stay cables with multiple camcorders

Localization and quantification of partial cable damage in the long-span cable-stayed bridge using the abnormal variation of temperature-induced girder deflection

Application of stochastic subspace identification for stay cables with an alternative stabilization diagram and hierarchical sifting process

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