Control of vortex shedding-induced effects in a sectional bridge model by spanwise perturbation method

El-Gammal, M.; Hangan, Horia; King, Paul I.

doi:10.1016/j.jweia.2007.01.006

Cited by 38 publications

(6 citation statements)

References 17 publications

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“…In addition, the airflow around the main girder could be modified by attaching or adjusting some non-structural parts (such as railings, parapets, maintenance rails and collision barriers) with specific shapes at the specific positions of the main girder [14,15]. El-Gammal et al [16] used the span-wise sinusoidal perturbation method (SPPM) module in both the leading and trailing edges of the plate girder bridge. The experimental results indicated that VIV responses could be dramatically suppressed with higher wave steepness.…”

Section: Introductionmentioning

confidence: 99%

Separation Control on a Bridge Box Girder Using a Bypass Passive Jet Flow

Zhang

Chen

et al. 2017

Applied Sciences

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Abstract:In the present study, a bypass passive jet flow control method was proposed to mitigate unsteady wind loads and to manipulate the flow field around a single box girder of a bridge. With a geometric ratio of 1:125, the single box girder model was determined using the cross-section of the Great Belt East Bridge. During the experiments, one test model without control was adopted, while five different test models with different suction/jet configurations were employed to analyze the effects of the control method and to reveal the underlying mechanism of different control schemes. The incoming wind speed was fixed to 12 m/s and the wind attack angles were changed from −20 • to 20 • , resulting in a corresponding Reynolds number of Re = 0.28 × 10 5 -0.74 × 10 5 based on the different attack angles. A six-component force balance, a set of digital sensor array (DSA) pressure transducers, and a particle image velocimetry (PIV) system was used to measure the aerodynamic forces, pressure distributions, and flow fields around the test models to evaluate the control effectiveness of different control cases. Detailed flow structures are presented and discussed for two test cases when the angles of attack are +15 • and −20 • . The effects of control on the aerodynamic forces were first investigated to determine and select the best one out of five control cases. The pressure distributions on the surface of the test model without control and the best control case were then compared to evaluate the control effectiveness of the pressure gradient and the fluctuating pressure coefficients. The flow fields around the test models demonstrate that the bypass passive jet flow control could decrease vortex strength, delay flow separation, and change recirculation region and size. The results of the aerodynamic forces, pressure distributions, and flow fields indicate that the bypass passive jet flow control method results in effective control.

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Section: Introductionmentioning

confidence: 99%

Separation Control on a Bridge Box Girder Using a Bypass Passive Jet Flow

Zhang

Chen

et al. 2017

Applied Sciences

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“…Gammal et al, [28] this research focuses on controlling the effects of vortex shedding in a sectional bridge model using the span wise perturbation method. The authors investigate the influence of span wise perturbations on the flow patterns and vortex shedding characteristics.…”

Section: State Of Developmentmentioning

confidence: 99%

Wind Induced Vibrations on Long Span Bridges

2023

IRJMETS

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This research paper aims to investigate the phenomenon of wind-induced vibrations on long-span bridges and propose mitigation strategies to enhance the safety and performance of these structures. The study begins by examining the fundamental concepts of aerodynamics and fluid-structure interaction, providing a theoretical foundation for understanding the complex interaction between wind and bridge structures. Various factors influencing wind-induced vibrations, such as wind speed, bridge geometry, and structural damping, are explored through analytical and numerical modelling techniques. The research identifies common vibration modes such as Vortex induced vibrations (VIV), Flutters, galloping, buffeting and critical wind speeds that trigger resonant responses in long-span bridges. It also evaluates the effectiveness of different control measures, including passive and active damping systems, to mitigate wind-induced vibrations. Computational simulations are utilized to optimize the design parameters of these control strategies.

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“…较为合适的控制方法. Li等人 [25] 综合分析桥梁风障、导流板等对主梁涡振的控制效果, 指出检修车道及栏杆极易导致主梁竖向涡振, 并应用展向正弦干扰方法 [26] 通过在栏杆间隔附加挡板的方式成功抑制了桥梁竖向涡振. Zhan等人 Main girders and cable structures are critical components of long-span bridges and usually have relatively low stiffness and damping ratios.…”

Section: 主动吸/吹气流动控制unclassified