Aerodynamic instability of a bridge deck section model: Linear and nonlinear approach to force modeling

Diana, Giorgio; Rocchi, Daniele; Argentini, Tommaso; Muggiasca, Sara

doi:10.1016/j.jweia.2010.01.003

Cited by 130 publications

(44 citation statements)

References 11 publications

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“…Significant progress has been made since Ukeguchi et al, (1966) presented the first experimental results for bridge decks in 1966, and an impressive amount of forced vibration rigs used in research can be found in the literature (e.g. Cao and Sarkar, 2012;Chen et al, 2005;Diana et al, 2004Diana et al, , 2010Diana et al, , 2015Falco et al, 1992;Han et al, 2014;Lee and Kwon, 2009;Li, 1995;Matsumoto et al, 1993;Matsumoto, 1996;Neuhaus et al, 2009;Sarkar et al, 2009). Forced vibration tests considering vertical and pitching motions are now routinely conducted when designing bridges, occasionally allowing for coupling between the two motions (Cao and Sarkar, 2012;Diana et al, 2004;Falco et al, 1992;Han et al, 2014).…”

Section: An Enhanced Forced Vibration Rigmentioning

confidence: 99%

An enhanced forced vibration rig for wind tunnel testing of bridge deck section models in arbitrary motion

Siedziako

Øiseth

Rönnquist

2017

Journal of Wind Engineering and Industrial Aerodynamics

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This paper presents a new experimental setup for the aerodynamic section model testing of bridge decks. The rig is designed to move a section model in arbitrary motion in a wind tunnel to imitate the motions of such scaled real bridge motion, step motion or random motion histories to be close to white noise. The proposed setup enables the forces acting on the section model to be measured directly while considering motions that resemble actual bridge motion and still fully utilizing the benefits of the forced vibration testing technique. The excellent performance of the system and testing procedure is proved by performing state-of-the-art forced vibration tests to extract 18 flutter derivatives of the Hardanger Bridge cross-section. The new experimental setup is further used to simulate a three-degree-of-freedom dynamic system driven by white noise to investigate whether the estimates of the aerodynamic derivatives are sensitive to the motion considered. The experimental results demonstrate that the estimates of the aerodynamic derivatives are not sensitive to the motion considered; these results indicate that the principle of superposition is fully applicable for the cross section as long as the motions are within the range considered.

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Section: An Enhanced Forced Vibration Rigmentioning

confidence: 99%

An enhanced forced vibration rig for wind tunnel testing of bridge deck section models in arbitrary motion

Siedziako

Øiseth

Rönnquist

2017

Journal of Wind Engineering and Industrial Aerodynamics

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“…To solve the similarity problem of turbulent flow characteristics effects, some researchers placed actively controlled devices in the beginning of the wind tunnel's working section to increase turbulence intensity and turbulence integral scale of the simulated flow. The employed actively controlled devices were vibrating grids [53] and active vanes [54][55][56][57][58][59][60][61][62][63]; (2) Re effects exist for wind tunnel model tests. The separation location for the flow around a bluff body without corners is extremely sensitive to Re.…”

Section: Similarity Problems With the Traditional Abl Wind Tunnel Simmentioning

confidence: 99%

Full-Scale/Model Test Comparisons to Validate the Traditional ABL Wind Tunnel Simulation Technique: A Literature Review

Dong¹,

Peng²,

Zhao³

et al. 2017

Preprint

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Abstract:Full-scale/model test comparison studies to validate the traditional atmospheric boundary layer (ABL) wind tunnel simulation technique are reviewed. According to the literature review, notable discrepancies between full-scale measurement results and model test results were observed by most performed comparison studies, but the causes of the observed discrepancies were not revealed in a scientific way by those studies. In this regard, a new research scheme for future full-scale/model test comparison studies is proposed in this article, which utilizes the multiple-fan actively controlled wind tunnel simulation technique. With the new research scheme, future full-scale/model test comparison studies are expected to reasonably disclose the main problems with the traditional ABL wind tunnel simulation technique, and the technique can be improved correspondingly.Keywords: comparison study; full-scale measurement; wind tunnel model test; multiple-fan actively controlled wind tunnel; research scheme IntroductionAs a mature technique applied in aviation industry, the wind tunnel model test was introduced into the field of wind-engineering research and design in 1960s. After Jensen [1] proposed that the flow field simulated in the wind tunnel should be similar to the actual atmospheric boundary layer (ABL) flow field for wind-engineering model tests, simulating ABL has become an indispensable test procedure. To fulfill the task of simulating realistic ABL turbulent flow fields in the wind tunnel, passive simulation devices, including spires, roughness elements, grids and barriers, can jointly be used. It has been found that the target flow fields can be obtained by adjusting the position and the number of some devices placed in the beginning of the wind tunnel [2,3]. During the past 50 years, most scientific researches and engineering practices made by the wind-engineering community utilized the traditional ABL wind tunnel simulation technique. With this technique, theoretical achievements were made, and numerous engineering structures' safety against extreme wind events was ensured.

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“…The coefficients in the model are frequency-independent, making the model convenient to implement in the time domain. Diana et al [8] developed a corrected quasi-steady theory by including aerodynamic nonlinearities. The predicted quasi-steady aerodynamic forces were reasonable but not perfectly correct.…”

Section: Introductionmentioning

confidence: 99%

Prediction of long-term extreme load effects due to wind for cable-supported bridges using time-domain simulations

Yang

Øiseth

Næss

et al. 2017

Engineering Structures

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Many long-span bridges that are slender and susceptible to wind-induced vibrations are currently under construction all over the world. As nonlinear structural behavior and nonlinear displacementdependent wind loads become of higher importance, time-domain methods are commonly applied instead of frequency-domain approaches. This paper discusses how rational functions, fitted to aerodynamic derivatives, can be converted to a state-space model to transform the frequencydependent aerodynamic forces into the time domain. A user element has been implemented in ABAQUS to include the self-excited forces in the dynamic analysis. The flutter stability limit and buffeting response of the Hardanger Bridge have been calculated in a comprehensive case study to illustrate the performance of the presented methodology. The Average Conditional Exceedance Rate method is used to estimate long-term extreme load effects. A simplified full long-term method that ignores wind velocities which contribute little to the long-term extreme values is introduced to reduce the required computational effort. The long-term predictions are also compared with results obtained using a short-term approach and it is concluded that the long-term extreme load effects are approximately 20% higher than the short-term extreme values.

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Aerodynamic instability of a bridge deck section model: Linear and nonlinear approach to force modeling

Cited by 130 publications

References 11 publications

An enhanced forced vibration rig for wind tunnel testing of bridge deck section models in arbitrary motion

An enhanced forced vibration rig for wind tunnel testing of bridge deck section models in arbitrary motion

Full-Scale/Model Test Comparisons to Validate the Traditional ABL Wind Tunnel Simulation Technique: A Literature Review

Prediction of long-term extreme load effects due to wind for cable-supported bridges using time-domain simulations

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