Numerical study of a twin box bridge deck with increasing gap ratio by using RANS and LES approaches

Miranda, Stefano de; Patruno, L.; Ricci, M.; Ubertini, Francesco

doi:10.1016/j.engstruct.2015.05.017

Cited by 46 publications

(19 citation statements)

References 25 publications

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“…1(a) and (b), a series of 1:80 simplified section models of twin-box girders without consideration of the deck secondary structures were performed in the TJ-1 Wind Tunnel of Tongji University to accommodate the size of sectional models and testing section. Since the SWR plays an important role in the aerodynamic performance of twin-box girder bridges [4,5], spring-supported rigid sectional models with five representative cases of SWR (i.e. D/Bs= 0.2, 0.4, 0.6, 0.8, and 1.0) were used in the testing to assess the control effectiveness of VCS on the flutter instability in twin-box girders bridges.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…To determine the flow structures for twin-box girders with VCS, the Smagorinsky subgrid-scale models for fluid-structural coupling and the free oscillation method [5] were used in this study. Based on a finite volume method (FVM), the unstructured grid system incorporating large eddy simulations (LES) modeling was used to discretize the governing Navier-Stokes equations [28].…”

Section: Numerical Modelmentioning

confidence: 99%

“…Twin-box girders with a center gap between two girders has been proven to be one of the effective aerodynamic countermeasures for improving the aerodynamic performance of long-span cable-supported bridges, and so its implementation becomes increasingly popular for long-span, or even super long-span bridges [1,2,3], e.g., Xihoumen Bridge with the main span of 1650 m (China) and Gwangyang Bridge with the main span of 1545 m (Korea). Nevertheless, twin-box girders with various Slot Width Ratios (SWRs, for example, the 20% SWR refers to D/Bs= 0.2, where D is slot width and Bs is the width of two decks) may exhibit different flutter performance [4,5]. Although the maximum growth rate of Critical Flutter Wind Speed (Ucr) could reach more than 20% after slotting for twinbox girders, the aerodynamic stability of the bridges becomes uncertain when the length of the growing span of the bridge is over certain limit [4,6].…”

Section: Introductionmentioning

confidence: 99%

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Flutter characteristics of twin-box girder bridges with vertical central stabilizers

Yang

Zhou

et al. 2017

Engineering Structures

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It has been well known that Vertical Central Stabilizers (VCS) have the potential of improving flutter performance of long-span bridges. However, the fundamental flutter mechanisms of VCS are still not fully understood so far. In this study, a series of windtunnel tests involving the combination of six representative heights and four types of VCS were conducted to fundamentally investigate the influence of VCS on flutter performance of twin-box girders with various Slot Width Ratios (SWRs). Experimental results show that the flutter instability of 20% SWR is significantly sensitive to the height change of VCS, whereas the VCS have little effect on the flutter performance for 80% and 100% SWR. In addition, the results from Two-Dimensional Three Degree of freedom (2D-3DOF) flutter analysis demonstrates that aerodynamic damping Part A with reference of flutter derivative A2 * makes the greatest contribution to the flutter instability for a 0.8 h/H VCS, while the role of Part D with reference of A1 * H3 * becomes critical for a short VCS (i.e. the ratio of h/H is less than 0.2). Besides, the results of Computational Fluid Dynamics simulation indicate that the geometry of VCS influence the transforming vortices' structures and pressure distribution under the central slotting. Finally, the modified Selberg formula presented in this study has the capability of predicting the critical flutter speed of twin-box girders with various SWRs and VCS.

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Section: Experimental Set-upmentioning

confidence: 99%

Section: Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flutter characteristics of twin-box girder bridges with vertical central stabilizers

Yang

Zhou

et al. 2017

Engineering Structures

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“…Reynolds average numerical simulations are performed using the k–ω shear stress transport (SST) model. This model is known to provide more accurate results, if compared to standard k–ω and k–ε models, in external aerodynamic cases which involve boundary layer separation (Miranda et al, 2015). The dimensionless time-step is set equal to 10 −3 .…”

Section: Aerodynamic Characteristics Of a Plate With Central Stabilizermentioning

confidence: 99%

Flutter performance and aerodynamic mechanism of plate with central stabilizer at large angles of attack

Tang

Shum

2017

Advances in Structural Engineering

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To analyze the effects of a central stabilizer on the flutter performance at large angles of attack, this study takes the ideal plate as a section of a bridge deck. The aerodynamic characteristics of stationary cross sections are examined using computational fluid dynamics simulations, and the flutter derivatives are extracted by forced vibration. The critical flutter speed of a target bridge is then calculated, and the aerodynamic mechanism of the central stabilizer is discussed from the work done by aerodynamic forces’ perspective. The results show that use of a central stabilizer with lower heights favors flutter stability at smaller angles of attack by improving the participation level of heaving motion, but the stability of the systematic heaving motion will decrease if the stabilizer is too high, leading to galloping. At larger angles of attack, where the movement of a big vortex causes the occurrence of torsional flutter, the stabilizer can hinder the movement of the vortex if they are on the same side, and the critical flutter speed increases with the increase in stabilizer height.

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“…This bare deck design was chosen due to the availability of experimental data for validation studies. Several CFD studies of flow characteristics around the sharp-edged twin-boxes, particularly with asymmetric geometry as in the present case, have been carried out [22][23][24]. These studies have mainly dealt with the overall flow conditions and their variations with the relative gap size, Reynolds number and turbulence models used in the simulations.…”

Section: Introductionmentioning

confidence: 99%

Unsteady RANS Simulations of Flow around a Twin-Box Bridge Girder Cross Section

et al. 2019

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The aerodynamic performance of bridge deck girders requires a thorough assessment and optimization in the design of long-span bridges. The present paper describes a numerical investigation of the aerodynamic characteristics of a twin-box bridge girder cross section in the range of angles of attack between −10.0° and +10.2°. The simulations are performed by solving 2D unsteady Reynolds-averaged Navier–Stokes (URANS) equations together with the k–ω shear stress transport (SST) turbulence model. The investigated Reynolds number (Re) based on the free stream velocity ( U ∞ ) and the height of the deck (D) is 31,000. The predicted aerodynamic characteristics such as the mean drag, lift and moment coefficients, are generally in good agreement with the results from the wind tunnel tests. Changes of flow patterns and aerodynamic forces with different angles of attack are investigated. Flow characteristics during one vortex shedding period are highlighted. Relative contributions of each of the two bridge decks to the overall drag and lift coefficients, with respect to the angle of attack, are also discussed.

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Numerical study of a twin box bridge deck with increasing gap ratio by using RANS and LES approaches

Cited by 46 publications

References 25 publications

Flutter characteristics of twin-box girder bridges with vertical central stabilizers

Flutter characteristics of twin-box girder bridges with vertical central stabilizers

Flutter performance and aerodynamic mechanism of plate with central stabilizer at large angles of attack

Unsteady RANS Simulations of Flow around a Twin-Box Bridge Girder Cross Section

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