Free vibration numerical simulation technique for extracting flutter derivatives of bridge decks

Fei, Xu; Zhang, Zhanbiao

doi:10.1016/j.jweia.2017.08.018

Cited by 25 publications

(9 citation statements)

References 19 publications

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“…In addition to the wind tunnel techniques discussed in the present paper, it is also possible to use computational fluid dynamics to estimate bridge deck flutter derivatives. Numerical simulation of the free vibration method are conducted in [32].…”

Section: Free Vibration System Identification Methodsmentioning

confidence: 99%

Flutter derivatives from free decay tests of a rectangular B/D = 10 section estimated by optimized system identification methods

Andersen

Øiseth

Johansson

et al. 2018

Engineering Structures

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The present paper suggests a hybrid system identification method to estimate the flutter derivatives from coupled free vibration tests. An optimized covariancebased method is used as the initial guess in the modified unifying least squares method. This combination optimizes the accuracy described by the coefficients of determinations between measured and synthesized signals. Flutter derivatives are identified at high wind speeds, close to and even above the critical flutter wind speed. Results for a sharp-edged rectangular section with a width-to-depth ratio B/D = 10 are presented for two different torsional-to-vertical frequency ratios. In one case the torsional frequency are lower than the vertical, due to a high mass moment of inertia, which makes it possible to estimate the flutter derivatives at very high reduced wind speeds. This reveals that the torsional aerodynamic damping derivative A * 2 reaches a positive maximum followed by a continuous decreasing tendency and eventually negative A * 2 values are identified. This implies that torsional flutter for the B/D = 10 section can be avoided if the structural damping is designed to balance the negative torsional aerodynamic damping expressed by the positive peak value for A * 2 .

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Section: Free Vibration System Identification Methodsmentioning

confidence: 99%

Flutter derivatives from free decay tests of a rectangular B/D = 10 section estimated by optimized system identification methods

Andersen

Øiseth

Johansson

et al. 2018

Engineering Structures

View full text Add to dashboard Cite

show abstract

“…Even with limited computational power, some pioneering studies [20][21][22] have shown the significant potential of CFD simulations in this area. Similar to the application of wind tunnel tests, CFD simulations have been adopted in the study of flutter [23][24][25], VIV [26][27][28][29], and RWIV [30][31][32][33]. On one hand, these numerical studies show good agreement with their corresponding wind tunnel results.…”

Section: Introductionmentioning

confidence: 95%

Assessing the Capability of Computational Fluid Dynamics Models in Replicating Wind Tunnel Test Results for the Rose Fitzgerald Kennedy Bridge

et al. 2021

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Despite its wide acceptance in various industries, CFD is considered a secondary option to wind tunnel tests in bridge engineering due to a lack of confidence. To increase confidence and to advance the quality of simulations in bridge aerodynamic studies, this study performed three-dimensional RANS simulations and DESs to assess the bridge deck aerodynamics of the Rose Fitzgerald Kennedy Bridge and demonstrated detailed procedures of the verification and validation of the applied CFD model. The CFD simulations were developed in OpenFOAM, the results of which are compared to prior wind tunnel test results, where general agreements were achieved though differences were also found and analyzed. The CFD model was also applied to study the effect of fascia beams and handrails on the bridge deck aerodynamics, which were neglected in most research to-date. These secondary structures were found to increase drag coefficients and reduce lift and moment coefficients by up to 32%, 94.3%, and 52.2%, respectively, which emphasized the necessity of including these structures in evaluations of the aerodynamic performance of bridges in service. Details of the verification and validation in this study illustrate that CFD simulations can determine close results compared to wind tunnel tests.

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“…This also leads to the third limitation of the forced vibration method. Xu and Zhang [61] suggest that to perform a forced vibration test at high wind velocity, the sectional model should be highly rigid and light in weight. However, these two factors are normally incompatible in an experimental condition.…”

Section: Wind Tunnel Studies Of Fluttermentioning

confidence: 99%

“…(2) Free vibration simulations Xu and Zhang [61] appear to be the first to incorporate the free vibration method into CFD simulations. They performed 2D URANS simulations with the k-ω SST turbulence model on three different geometries-an idealised thin-plate deck, a trapezoidal deck and a streamlined deck with lateral cantilevers.…”

Section: (1) Forced Vibration Simulationsmentioning

confidence: 99%

Wind-Induced Phenomena in Long-Span Cable-Supported Bridges: A Comparative Review of Wind Tunnel Tests and Computational Fluid Dynamics Modelling

2021

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Engineers, architects, planners and designers must carefully consider the effects of wind in their work. Due to their slender and flexible nature, long-span bridges can often experience vibrations due to the wind, and so the careful analysis of wind effects is paramount. Traditionally, wind tunnel tests have been the preferred method of conducting bridge wind analysis. In recent times, owing to improved computational power, computational fluid dynamics simulations are coming to the fore as viable means of analysing wind effects on bridges. The focus of this paper is on long-span cable-supported bridges. Wind issues in long-span cable-supported bridges can include flutter, vortex-induced vibrations and rain–wind-induced vibrations. This paper presents a state-of-the-art review of research on the use of wind tunnel tests and computational fluid dynamics modelling of these wind issues on long-span bridges.

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Free vibration numerical simulation technique for extracting flutter derivatives of bridge decks

Cited by 25 publications

References 19 publications

Flutter derivatives from free decay tests of a rectangular B/D = 10 section estimated by optimized system identification methods

Flutter derivatives from free decay tests of a rectangular B/D = 10 section estimated by optimized system identification methods

Assessing the Capability of Computational Fluid Dynamics Models in Replicating Wind Tunnel Test Results for the Rose Fitzgerald Kennedy Bridge

Wind-Induced Phenomena in Long-Span Cable-Supported Bridges: A Comparative Review of Wind Tunnel Tests and Computational Fluid Dynamics Modelling

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Free vibration numerical simulation technique for extracting flutter derivatives of bridge decks

Cited by 25 publications

References 19 publications

Flutter derivatives from free decay tests of a rectangular B/D = 10 section estimated by optimized system identification methods

Flutter derivatives from free decay tests of a rectangular B/D = 10 section estimated by optimized system identification methods

Assessing the Capability of Computational Fluid Dynamics Models in Replicating Wind Tunnel Test Results for the Rose Fitzgerald Kennedy Bridge

Wind-Induced Phenomena in Long-Span Cable-Supported Bridges: A Comparative Review of Wind Tunnel Tests and Computational Fluid Dynamics Modelling

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Flutter derivatives from free decay tests of a rectangular B/D = 10 section estimated by optimized system identification methods

Flutter derivatives from free decay tests of a rectangular B/D = 10 section estimated by optimized system identification methods