Strong Wind Characteristics and Buffeting Response of a Cable-Stayed Bridge under Construction

Yan, Lei; Ren, Lei; He, Xuhui; Lu, Siying; Guo, Hui; Wu, Teng

doi:10.3390/s20041228

Cited by 8 publications

(5 citation statements)

References 40 publications

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“…An ultrasonic anemometer and accelerometer are installed on the PSRB Guyumen cable-stayed bridge with a main span of 364 m (Yan et al, 2020). The sampling frequencies of the ultrasonic anemometer and accelerometer are 4 Hz and 51.2 Hz, respectively.…”

Section: Data Sourcementioning

confidence: 99%

Identification of modal parameters of long-span bridges under various wind velocities

Yan

et al. 2022

ABEN

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The modal parameters identification of bridges under non-stationary environmental excitation has caught the attention of researchers. This paper studies the non-stationarity of wind velocity, and extracts the time-varying mean wind velocity based on a discrete wavelet transform and recursive quantitative analysis. The calculated turbulence intensity and turbulence integral scale under the non-stationary model are smaller than those under the stationary model, especially the turbulence integral scale. The empirical wavelet transform is used to identify the modal parameters of long-span bridges, and the power spectral density spectrum is proposed as a replacement for the Fourier spectrum as the basis of the frequency band selection. The bridge modal parameters are then compared using the covariance-driven stochastic subspace system identification method (SSI-COV) and the Hilbert transform method based on an improved empirical wavelet transform (EWT-HT). Both methods can accurately identify the modal frequency, and the absolute difference between these two methods is equal to 0.003 Hz. The wind velocity results in a change of less than 1% in the modal frequency. The absolute difference between the modal damping ratios identified using SSI-COV and EWT-HT is significant and can reach 0.587%. The modal damping ratios are positively correlated with the mean wind velocities, which aligns with the quasi-steady assumption. In addition, the applicability of SSI-COV and EWT-HT is also evaluated using the standard deviation, coefficient of variation, and range dispersion indicators. The results show that the EWT-HT is more applicable to the identification of the modal parameters of long-span bridges under non-stationary wind velocities.

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Section: Data Sourcementioning

confidence: 99%

Identification of modal parameters of long-span bridges under various wind velocities

Yan

et al. 2022

ABEN

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“…Figure 9 shows the relationship between the gust factor and longitudinal turbulence intensity under the stationary model and nonstationary model. Many scholars have fitted the relationship between gust factor and longitudinal turbulence intensity [26,27]. The expressions of the relationship between gust factor and the intensity of longitudinal turbulence are presented based on the linear model and the nonlinear model, which can be expressed in one equation as follows: Many scholars have fitted the relationship between gust factor and longitudinal turbulence intensity [26,27].…”

Section: Gust Factormentioning

confidence: 99%

“…Many scholars have fitted the relationship between gust factor and longitudinal turbulence intensity [26,27]. The expressions of the relationship between gust factor and the intensity of longitudinal turbulence are presented based on the linear model and the nonlinear model, which can be expressed in one equation as follows: Many scholars have fitted the relationship between gust factor and longitudinal turbulence intensity [26,27]. The expressions of the relationship between gust factor and the intensity of longitudinal turbulence are presented based on the linear model and the nonlinear model, which can be expressed in one equation as follows:…”

Section: Gust Factormentioning

confidence: 99%

where Ishizaki suggested

= 0.5,

= 1.0 for typhoons [ 28 ]; Choi suggested

= 0.62,

= 1.27 [ 29 ]; Cao suggested

= 0.5,

= 1.15 for Typhoon Maemi [ 30 ]; Tao et al suggested

= 0.26,

= 0.91 for a nonstationary model [ 21 ]; and He et al suggested

= 0.45,

= 0.96 for a nonstationary model [ 17 ].…”

Section: Field Measurements and Wind Characteristicsmentioning

confidence: 99%

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Field Monitoring and Analysis of the Vibration of Stay Cables under Typhoon Conditions

Guo

Zhu²

2020

Sensors

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Structural health monitoring systems provide many advantages for full-scale measurements in bridge monitoring. In this study, a strong landing typhoon event recorded at the Jintang Bridge (Zhejiang Province, China) in 2019 was selected to study the nonstationary wind and cable vibration characteristics. To study the characteristics of the recorded typhoon, the time-varying mean wind was extracted based on the adaptive method of the wavelet-matrix transform. The nonstationary characteristics of Typhoon Lekima, including the turbulence intensity, gust factor, and fluctuating wind power spectral density, were analyzed and compared with the stationary model characteristics of a typhoon, and the typical characteristics and parameters were obtained. In addition, the measured vibration response of the cables was analyzed. The vibration characteristics of the cables and the energy distribution of the wind speed wavelet packet were investigated. The vibrations at different positions were compared. A power spectrum analysis and a wavelet packet energy analysis of the cable were performed. The results of this study can be used as a basis for wind-resistant design and performance evaluation of bridges under similar operational conditions.

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“…Noting that the stiffness of a cablestayed bridge during erection may be much lower than that in service. The cable-stayed bridge under construction is more susceptible to wind effects [5][6][7]. Moreover, long-span bridges usually employ the design of high piers to cross deep canyons, resulting in larger buffeting responses.…”

Section: Introductionmentioning

confidence: 99%

Buffeting Characteristics of a Long-Span Cable-Stayed Bridge Crossing a Deep Canyon during Erection: Response Evaluation and Vibration Control

Zhang,

2024

Buildings

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The stiffness of a long-span cable-stayed bridge under construction may be much lower than that observed in service, making it more susceptible to wind effects, especially for a bridge designed using high piers crossing a deep canyon. To study the buffeting characteristics of such cable-stayed bridges under construction, a long-span cable-stayed bridge (the main span is 575 m) is taken as the engineering background. In this study, the buffeting responses and vibration countermeasures at three different construction states were systematically studied using time-domain analysis. It was found that the buffeting response enlarges with an increase in the wind attack angle. The RMS values of the vertical buffeting of the bridge deck end are relatively greater at the maximum double cantilever construction state and maximum single cantilever state. At maximum double cantilever construction state, the traditional wind-resistant cable connecting the bridge deck end to the bridge pile cap significantly reduces the vertical buffeting response, while the suppression effect on lateral and torsional buffeting is limited. When the bridge deck nears completion, wind-resistant cables installed at both cantilever ending in the ‘soft connection’ method would effectively suppress the vertical, lateral, and torsional buffeting. The suppression effect of cross-arranged wind-resistant cables is superior to that of the parallel arrangement. It is recommended that a reasonable wind-resistant cable layout scheme according to different construction conditions is selected.

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Strong Wind Characteristics and Buffeting Response of a Cable-Stayed Bridge under Construction

Cited by 8 publications

References 40 publications

Identification of modal parameters of long-span bridges under various wind velocities

Identification of modal parameters of long-span bridges under various wind velocities

Field Monitoring and Analysis of the Vibration of Stay Cables under Typhoon Conditions

Buffeting Characteristics of a Long-Span Cable-Stayed Bridge Crossing a Deep Canyon during Erection: Response Evaluation and Vibration Control

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