Investigation of vortex response of a twin box bridge section at high and low Reynolds numbers

Larsen, Allan; Savage, M.G.; Lafrenière, Andréane; Hui, Michael C. H.; Larsen, Søren V.

doi:10.1016/j.jweia.2007.06.020

Cited by 111 publications

(25 citation statements)

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“…As reviewed by Larose and D'Auteuil [19], the Reynolds number sensitivity of the aerodynamics of bluff bodies with sharp edges and concluded that ignoring the Reynolds number effect of bluff bodies such as box-like bridge decks can lead to systematic errors. Larsen et al [20] conducted an investigation on the vortex characteristics of a twin box bridge section at different Reynolds numbers. In our group, the Reynolds number effects of twin-box girders have always been a hot topic.…”

Section: Model Configurationmentioning

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: Model Configurationmentioning

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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“…Larsen et al [6] discussed the guide vane of box girder for suppression of the VIV of the Great Belt Bridge. He provided a general design of the guide vane for the twin box girder of Stonecutter Bridge in Hongkong [7], but this design would raise the construction cost. Diana et al [8] investigated the vortex-shedding phenomena of the multi-box deck shape of Messina Strait Bridge and discovered the remarkable VIV phenomena in the bridge, but he did not provide the effective measures to suppress the VIV of the triplet girder.…”

Section: Introductionmentioning

confidence: 99%

Influence of aerodynamic configuration of a streamline box girder on bridge flutter and vortex-induced vibration

Wang

Liao

et al. 2011

J. Mod. Transport.

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Streamline box girders are widely applied in the design and construction of long-span bridges all over the world. In order to study the influence of modifications of aerodynamic configuration and accessory components on flutter and vortex-induced vibration (VIV), more than 60 cases were tested through a 1 50 scale section model. The test results indicates that the aerodynamic configuration and accessory components of streamline box girders can significantly affect the wind-induced vibration of bridge, which is in good agreement with the experience of past researchers. From the tests carried out, it is observed that if the horizontal angle of the inclined web of the streamline box girder is below 16°, the critical flutter wind speed of bridge will increase remarkably, and the VIV will diminish. The test results also show that the 15° inclined web can restrain the formation of vortex near the tail, and consequently improve the performance of aerodynamic stability of long-span bridges. Finally, a new streamline box girder with 15° inclined web was presented and strongly recommended in the aerodynamic configuration design of long-span bridges.

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“…However, recently several studies have demonstrated that aerodynamic characteristics and wind response of bridges and generally bluff sections can be influenced by (Hui and Larsen, 2002;K. Matsuda, 2001;Larose and D'Auteuil, 2006;Larsen et al, 2008;Schewe, 2001;Schewe and Larsen, 1998). Schewe and Larsen (1998) studied the flow around a bluff bridge deck in a pressurized wind tunnel capable of reproducing typical model scale ( ≈10 ) and prototype conditions ( ≈10 ).…”

Section: Effects On Wind Tunnel Testingmentioning

confidence: 99%

“…Larose and D'Auteuil (2006) investigated the effects of edge sharpness, turbulence and width-to-depth ratio on sensitivity for rectangular prisms to parameterize the link between the geometry of a 13 bluff body with the sensitivity of its aerodynamics to . Larsen et al (2008) that not only the flow characteristics can change the bridge aerodynamic behavior, but also the section shape and detailing can mitigate or worsen the aerodynamic instability.…”

Section: Effects On Wind Tunnel Testingmentioning

confidence: 99%

“…There are some studies in the literature considering the effect of bridge deck shape and detailing on the vortex induced vibration of long span bridges (Larsen et al, 2008 In order to depict the effect of the aforementioned parameters ( , turbulence characteristics and shape details) on the aerodynamic response of a bridge deck, several parameters were investigated. The first parameter to study was the pressure distribution around the girders.…”

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confidence: 99%

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Large-Scale Testing to Study the Effects of Critical Parameters on the Aerodynamic Behavior of Long Span Bridges

Kargarmoakhar¹

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All rights reserved.iv DEDICATION This dissertation is dedicated to my wife, Maryam Asghari Mooneghi. There is an old quote saying that "No man succeeds without a good woman behind him". I should say that this is more than true in my case. My wife not only was my support as my best friend during my career, let me share with her the difficulties I faced and helped me relax, but also was a great scientist with whom I was able to discuss about challenging problems. There were some days I was near to a complete surrender, but her sacrifices let me stand up again and continue the way. I am always grateful to my wife, not only as my wife but as my closest friend and I want to thank her for her supports during the precious time that we spent together at FIU and at Wall of Wind to get our PhDs. Wind tunnel testing is a well-established practice to evaluate the stability of bridges against wind loads. In order to study the response of the prototype in laboratory, dynamic similarity requirements should be satisfied. One of the parameters that is normally violated in wind tunnel testing is Reynolds number. In this dissertation, the effects of Reynolds number on the aerodynamics of a double deck bridge were evaluated by measuring fluctuating forces on a motionless sectional model of a bridge at different wind speeds representing different Reynolds regimes. Also, the efficacy of vortex mitigation devices was evaluated at different Reynolds number regimes. Not only the flow properties play an important role on the aerodynamic response of the bridge, but also the geometry of the cross section shape is expected to have significant effects. In this dissertation, the effects of deck details, such as width of the gap between the twin decks, and traffic barriers on the aerodynamic characteristics of a twin deck bridge were investigated, particularly on the vortex shedding forces with the aim of clarifying how these shape details can alter the wind induced responses.

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Investigation of vortex response of a twin box bridge section at high and low Reynolds numbers

Cited by 111 publications

References 1 publication

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

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

Influence of aerodynamic configuration of a streamline box girder on bridge flutter and vortex-induced vibration

Large-Scale Testing to Study the Effects of Critical Parameters on the Aerodynamic Behavior of Long Span Bridges

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