VIV Properties of
            <i>π</i>
            -Shaped Bridge Sectional Model: Dependence on Torsional-Bending Frequency Ratio

Wang, Zhixiong; Zhang, Zhitian

doi:10.1061/(asce)be.1943-5592.0001720

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…The aspect ratio of the length and width of the girder model is 3.2. Generally, when the ratio is less than 4, the three-dimensional effect exerts influence on the sectional model wind tunnel results (Wang, 2021). To ensure the two-dimensional characteristics of the flow field around the bridge girder model, end plates are set at both ends of the model.…”

Section: Methodsmentioning

confidence: 99%

Vortex-induced vibration performance and mechanism of long-span railway bridge streamlined box girder

Duan

2023

Advances in Structural Engineering

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To investigate the vortex-induced vibration (VIV) characteristics of a narrow-streamlined railway box girder and optimize its VIV performance, a long-span railway cable-stayed bridge was analyzed. Based on sectional model wind tunnel tests, the influence of the wind attack angle and the damping ratio on the VIV performance of the girder was investigated. The main inducing factors of the VIV of the narrow railway box girder were explored and a series of corresponding optimization schemes was put forward. The results show that there is no VIV when the wind attack angles are −5°, −3° and 0°, and the damping ratio is 0.2%. The non-dimensional maximum amplitudes 1000 y/ D of the girder at wind attack angles of +3° and +5° are 14.4 and 19.4, respectively. The maximum amplitudes decrease with the increase of the damping ratios. The railing base is the influence factor that induces the vertical VIV, because the separation vortices between the railing base and ballast wall, as well as behind the railings, cause the VIV of the railway steel box girder. Compared with that of the girder section with the ballastless track board, the non-dimensional maximum vertical VIV amplitude of the girder without the ballastless track board greatly increases from 19.4 to 63.5, which could effectively suppress the VIV of the main girder. Lastly, in the construction state, vertical VIV occurs for girder sections I and II, which have respective aspect ratios of 4.3 and 4.6, at wind attack angles of +3° and +5°. Girder section III, which has a 6.7 aspect ratio and is more streamlined, does not have a VIV. The greater the aspect ratio of the bridge girder, the better the VIV performance. The relevant results could serve as a guide for wind resistance design of railway streamlined box girders.

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Section: Methodsmentioning

confidence: 99%

Vortex-induced vibration performance and mechanism of long-span railway bridge streamlined box girder

Duan

2023

Advances in Structural Engineering

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“…It has been found that the stream-wise oscillations of a circular cylinder have a substantial effect on the transverse vibrations [44]. Reference [45] found that the participation of torsional oscillation drastically decreases the vortex-induced transverse motion amplitude. They also pointed out that there is not only a phenomenon of energy transformation from transverse to torsional direction, but also a significant drop in the total mechanical energy of the system.…”

Section: Nonlinear Aerodynamic Dampingmentioning

confidence: 99%

Motion-amplitude-dependent nonlinear VIV model and maximum response over a full-bridge span

Zhang

2023

Nonlinear Dyn

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Nonlinear vortex-induced vibration (VIV) performances of a bridge section are investigated in terms of motion amplitude (𝑦 𝑇 ) dependent energy-trapping properties.Energy-trapping properties of a model undergoing a full-process from still to a limit cycle oscillation (LCO) state are determined. A van der Pol-type model is used to describe the amplitude-dependent VIV performances. Nonlinear parameter-amplitude relations, 𝜀-𝑦 𝑇 and 𝜉 𝜀 -𝑦 𝑇 , are established. Nonlinear aerodynamic damping during the VIV lock-in range is separated into two parts: the initial damping which varies with the reduced wind speed, and the 𝜀-related part which varies with both the reduced wind speed and the motion amplitude. The initial aerodynamic damping determines the threshold of VIV, while the 𝜀 -related part dominates the evolution process and the LCO. The identified nonlinear analytical model is capable of predicting VIV responses at higher mechanical damping ratios. The energy-trapping properties of a section model in time are transformed into nonlinear distribution properties in space along an elongated 3-D elastic bridge span. According to this "time-space" transformation, the convection coefficient, which links the maximum response of a 3-D structure with that of a 2-D sectional model can be determined. Compared with a constant-parameter analytical model, a nonlinear model results in significantly larger convection coefficients. Finally, parameter overflowing phenomena are revealed.

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“…According to the findings, the inclined railing may significantly lower flow pulsation velocity in the wake, as well as the span-wise correlation of flow velocity in the wake. Wang and Zhang (2021) [23] investigated the effect of the torsional-bending frequency ratio on the VIV performance of π-shaped sections and discovered that torsional motion causes a small amount of energy to be transferred from vertical to torsional.…”

Section: Introductionmentioning

confidence: 99%

Study on the Correspondence of Vortex Structures and Vortex-Induced Pressures for a Streamlined Box Girder

et al. 2022

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The main goal of this paper is to explore the mechanism of vortex-induced vibration (VIV) of a streamlined box girder from the perspective of flow field and pressure distribution. In this paper, using the computational fluid dynamic method, the VIV performance of fluid under specific working conditions is simulated and analyzed, especially the distribution and evolution laws of vortex structures in the whole process of VIV are studied in depth. Based on the analysis of the flow field distribution, the corresponding relationship between vortex structures and vortex-induced pressures (VIPs) is discussed. The results demonstrate that the primary cause of VIV for streamlined box girders at large attack angles is the circulation process of the massive vortex structures production and dissipation on the upper surface, rather than the alternate shedding of symmetrical vortex pairs. When vortex structures remain stable, negative VIPs rise in absolute value, negative VIPs occur when vortex structures move backward, and positive VIPs increase when vortex structures fall off.

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VIV Properties of π -Shaped Bridge Sectional Model: Dependence on Torsional-Bending Frequency Ratio

Cited by 7 publications

References 22 publications

Vortex-induced vibration performance and mechanism of long-span railway bridge streamlined box girder

Vortex-induced vibration performance and mechanism of long-span railway bridge streamlined box girder

Motion-amplitude-dependent nonlinear VIV model and maximum response over a full-bridge span

Study on the Correspondence of Vortex Structures and Vortex-Induced Pressures for a Streamlined Box Girder

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