Effect of Accessory Attachment on Static Coefficients in a Steel Box Girder for Long - Span Suspension Bridges

Liu, Lianjie; Zhang, Liangliang; Wu, Bo; Chen, Ben

doi:10.25103/jestr.101.11

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…Furthermore, the temperature and gravity effects in bridge aerodynamic studies are often neglected, as their contribution to the forces are negligible. During bridge design, aerodynamic coefficients are often used to estimate the aerodynamic performance of a bridge [48][49][50]. These parameters can be calculated from simulations using the Reynolds-averaged Navier-Stokes (RANS) formulations (for example, as implemented in simpleFoam):…”

Section: Modelling Assumptionsmentioning

confidence: 99%

Analyzing Wind Effects on Long-Span Bridges: A Viable Numerical Modelling Methodology Using OpenFOAM for Industrial Applications

Zhang,

MacReamoinn,

Cardiff

et al. 2023

Infrastructures

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Aerodynamic performance is of critical importance to the design of long-span bridges. Computational fluid dynamics (CFD) modelling offers bridge designers an opportunity to investigate aerodynamic performance for long-span bridges during the design phase as well as during operation of the bridge. It offers distinct advantages when compared with the current standard practice of wind tunnel testing, which can have several limitations. The proposed revisions to the Eurocodes offer CFD as a methodology for wind analysis of bridges. Practicing engineers have long sought a computationally affordable, viable, and robust framework for industrial applications of using CFD to examine wind effects on long-span bridges. To address this gap in the literature and guidance, this paper explicitly presents a framework and demonstrates a workflow of analyzing wind effects on long-span bridges using open-source software, namely FreeCAD, OpenFOAM, and ParaView. Example cases are presented, and detailed configurations and general guidance are discussed during each step. A summary is provided of the validation of this methodology with field data collected from the structural health monitoring (SHM) systems of two long-span bridges.

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Section: Modelling Assumptionsmentioning

confidence: 99%

Analyzing Wind Effects on Long-Span Bridges: A Viable Numerical Modelling Methodology Using OpenFOAM for Industrial Applications

Zhang,

MacReamoinn,

Cardiff

et al. 2023

Infrastructures

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show abstract

“…is can provide insight into fluid mechanisms [40] and guide the structural designs in wind-engineering to a better level [45]. e details of the CFD simulation can be found in a previous work conducted by the author [46], where the accuracy of the simulation is validated by comparing the numerical aerostatic forces and experimental ones. e flow patterns around the girder of different cases and at different AoAs are shown in Figure 21.…”

Section: With and Without Subsidiary Structuresmentioning

confidence: 99%

Refined Time‐Domain Buffeting Analysis of a Long‐Span Suspension Bridge in Mountainous Urban Terrain

Zhang

Yang

et al. 2020

Advances in Civil Engineering

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The field measurements, wind tunnel tests, and numerical calculations are utilized to conduct refined time-domain buffeting analysis of a long-span suspension bridge. The wind characteristics in the mountainous urban terrain are obtained through long-term field measurements. The aerostatic force coefficients (AFCs) and aerodynamic admittance functions (AAFs) are experimentally tested in a wind tunnel. The fluctuating wind fields on the bridge are simulated by the spectral representation method. Finally, the buffeting responses are calculated in ANSYS. The influences of AAF, turbulence power spectrum, and angle of attack (AoA) on the buffeting responses are evaluated, which highlight the inaccuracies caused by empirical simplifications. To improve the buffeting performance without a considerable extra budget, minor modifications are introduced to the original design configuration. The buffeting responses are slightly reduced by increasing the ventilation rate of guardrails, and the control efficiency is better when concurrently moving the inspection rails inward. Besides, the buffeting responses are increased when considering the roughness on the girder surface. The influence mechanism of the countermeasure is analyzed using the Computational Fluid Dynamics (CFD) method, which mainly lies in the dissipation of turbulence energy around the girder. The findings can contribute to the wind-resistant analysis and optimization design for similar bridges.

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“…To date, there has been relatively little research into the impact on aerodynamic coefficients of including secondary structures in CFD models. Liu et al [35] studied the effect of multiple rails on the aerodynamic coefficient of a steel box bridge deck by performing two-dimensional (2D) RANS simulations with the k-ω SST turbulence model. It was found that the drag coefficients of bridge decks without any detailed structures were 30% to 40% smaller than those of bridge decks with guard rails installed.…”

Section: Introductionmentioning

confidence: 99%

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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Effect of Accessory Attachment on Static Coefficients in a Steel Box Girder for Long - Span Suspension Bridges

Cited by 4 publications

References 25 publications

Analyzing Wind Effects on Long-Span Bridges: A Viable Numerical Modelling Methodology Using OpenFOAM for Industrial Applications

Analyzing Wind Effects on Long-Span Bridges: A Viable Numerical Modelling Methodology Using OpenFOAM for Industrial Applications

Refined Time‐Domain Buffeting Analysis of a Long‐Span Suspension Bridge in Mountainous Urban Terrain

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

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