Bridge deck flutter derivatives: Efficient numerical evaluation exploiting their interdependence

Nieto, Francisco Javier Fernández; Owen, J.S.; Hargreaves, David; Hernández, Santiago

doi:10.1016/j.jweia.2014.11.006

Cited by 52 publications

(25 citation statements)

References 42 publications

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“…In all cases the mean value of y + is y + ≤ 2, obtaining for the medium mesh the values presented in Table 3. The values obtained are very similar to the ones reported by Nieto et al [21] for a rectangular cylinder of width to depth ratio 4.9:1.…”

Section: Verification Study and Static Case Resultssupporting

confidence: 91%

Study of a Static and Vertically Free-to-Oscillate 4:1 Rectangular Cylinder by Means of 2d Urans Simulations

Naveira

Nieto

Hernández

2018

Advances in Fluid Mechanics XII

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Flexible structures, such as cable-supported bridges, are prone to suffer from vortex-induced vibrations (VIV) under wind flow, as their span lengths are steadily growing in the last decades. VIV is a phenomenon that takes place at reduced wind speeds. The movements of the structure at VIV are selflimited and their frequency corresponds with the natural frequency of the structure (lock in). Therefore, VIV affects the structure's serviceability and can cause fatigue related damage. Hence, the need for identifying and avoiding this phenomenon at the early design stages is a key issue in long-span bridges design. In the present study a rectangular cylinder of width to depth ratio 4:1, which is a common simplification of a bridge deck cross section, is analysed for the static case as well as undergoing free vibration in the vertical direction under wind flow. These analyses have been carried out by 2D URANS CFD simulations, adopting two different turbulence models: the k − ω SST, which is based upon the Boussinesq eddy-viscosity approximation, and the Reynolds Stress Model, which directly calculates the components of the specific Reynolds stresses. For the static case the force coefficients, Strouhal number and the pressure coefficient distributions were calculated and compared with the available experimental data. In the case of the free-to-oscillate 4:1 rectangular cylinder, the oscillation amplitudes are compared with wind tunnel data reported in the literature. In addition, the frequencies and phase-lags between the time-dependent lift coefficient and the vertical oscillations are studied.

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Section: Verification Study and Static Case Resultssupporting

confidence: 91%

Study of a Static and Vertically Free-to-Oscillate 4:1 Rectangular Cylinder by Means of 2d Urans Simulations

Naveira

Nieto

Hernández

2018

Advances in Fluid Mechanics XII

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“…Thanks to the increasing power of modern computers, Computational Fluid Dynamics (CFD) techniques are becoming an increasingly attractive tool for studying the aerodynamic behavior of bridge decks [4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Accuracy of numerically evaluated flutter derivatives of bridge deck sections using RANS: Effects on the flutter onset velocity

Patruno

2015

Engineering Structures

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“…The effectiveness of the sst (shear-stress-transport) and the standard (std) RANSbased turbulence models in predicting flutter derivatives had been compared, and the k-sst formulation proved to be more accurate than the k-std [9]. A 2D unsteady Reynolds-averaged Navier-Stokes (URANS) approach adopting Menter's SST k-turbulence model was employed for computing the flutter and the static aerodynamic characteristics, and the conclusions indicated that the results provided by the proposed methodology agree well with the experimental data [10]. The performances of standard Smagorinsky-Lilly and Kinetic Energy Transport turbulence models were applied to study the unsteady flow field around a rectangular cylinder [11].…”

Section: Introductionmentioning

confidence: 90%

Flutter Performance of the Emergency Bridge with New‐Type Cable‐Girder

Yang

Shao

et al. 2019

Mathematical Problems in Engineering

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Based on the proposed emergency bridge scheme, the flutter performance of the emergency bridge with the new-type cable-girder has been investigated through wind tunnel tests and numerical simulation analyses. Four aerodynamic optimization schemes have been developed in consideration of structure characteristics of the emergency bridge. The flutter performances of the aerodynamic optimization schemes have been investigated. The flutter derivatives of four aerodynamic optimization schemes have been analyzed. According to the results, the optimal scheme has been determined. Based on flutter theory of bridge, the differential equations of flutter of the emergency bridge with new-type cable-girder have been established. Iterative method has been used for solving the differential equations. The flutter analysis program has been compiled using the APDL language in ANSYS, and the bridge flutter critical wind speed of the optimal scheme has been determined by the program. The flutter analysis program has also been used to determine the bridge flutter critical wind speed of different wind-resistance cable schemes. The results indicate that the bridge flutter critical wind speed of the original emergency bridge scheme is lower than the flutter checking wind speed. The aerodynamic combined measurements of central-slotted and wind fairing are the optimal scheme, with the safety coefficients larger than 1.2 at the wind attack angles of −3°, 0°, and +3°. The bridge flutter critical wind speed of the optimal scheme has been determined using the flutter analysis program, and the numerical results agree well with the wind tunnel test results. The wind-resistance cable scheme of 90° is the optimal wind cable scheme, and the bridge flutter critical wind speed increased 31.4%. However, in consideration of the convenience in construction and the effectiveness in erection, the scheme of wind-resistance cable in the horizontal direction has been selected to be used in the emergency bridge with new-type cable-girder.

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Bridge deck flutter derivatives: Efficient numerical evaluation exploiting their interdependence

Cited by 52 publications

References 42 publications

Study of a Static and Vertically Free-to-Oscillate 4:1 Rectangular Cylinder by Means of 2d Urans Simulations

Study of a Static and Vertically Free-to-Oscillate 4:1 Rectangular Cylinder by Means of 2d Urans Simulations

Accuracy of numerically evaluated flutter derivatives of bridge deck sections using RANS: Effects on the flutter onset velocity

Flutter Performance of the Emergency Bridge with New‐Type Cable‐Girder

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