Cross-spectral recognition method of bridge deck aerodynamic admittance function

Zhao, Lin; Ge, Yaojun

doi:10.1007/s11803-015-0048-8

Cited by 19 publications

(13 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hejlesen M. M. [29] estimated the aerodynamic admittance of bridge sections by mesh-free vortex method and confirmed its feasibility by comparing to available wind tunnel data. Zhao L. [30] proposed a new identification algorithm about the admittance function and validated it by a comparison between the numerical calculation and wind tunnel tests. Hua X. G. [31] developed an improved perturbation method for the statistical identification of structural parameters by using the measured modal parameters with randomness.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic admittance influence on buffeting performance of suspension bridge with streamlined deck

Yao¹,

Yang²,

Wu³

et al. 2019

J. vibroeng.

View full text Add to dashboard Cite

Buffeting performance is growing sensitive to external and internal factors with increasing span of bridge. Aerodynamic admittance is an essential parameter in analyzing buffeting performance. In this paper, aerodynamic admittance in different conditions were conducted in wind tunnel tests by section model. Three kinds of aerodynamic admittance functions were used to calculating buffeting performance respectively. It is found that the aerodynamic admittance of streamlined deck is closely related to wind attack angle, and has a small difference at different wind speeds. However, the influence of aerodynamic admittance on buffeting performance is affected by the wind speed significantly. Under given conditions, adopting the Sears function as the admittance function of a similar streamlined box girder is reasonable, while the buffeting performance result obtained by adopting an admittance function as 1.0 is very conservative.

show abstract

Section: Introductionmentioning

confidence: 99%

Aerodynamic admittance influence on buffeting performance of suspension bridge with streamlined deck

Yao¹,

Yang²,

Wu³

et al. 2019

J. vibroeng.

View full text Add to dashboard Cite

show abstract

“…(4) may be exceeded as shown by Ma et al (2013), where the 2D admittance was determined to be dependent on the turbulent characteristics of a single harmonic. This requires further investigations (Zhao and Ge, 2015). For lower reduced velocities (V r 5) however, the numerical noise in the aerodynamic admittance based on random free-stream is more significant and there is a higher deviation w.r.t.…”

Section: Random Free-stream Turbulence: Comparisonmentioning

confidence: 97%

“…In the 2D linear unsteady model, the aerodynamic forces for a stationary body are obtained as a linear superposition of the static and buffeting forces due to mean wind and incident fluctuations, respectively (Chen and Kareem, 2002). Further, the dependence on the turbulent characteristics in terms of intensity and the co-acting of the fluctuating components is not considered within this aerodynamic model (Ma et al, 2013;Matsuda et al, 1999;Zhao and Ge, 2015), as well as the local turbulence and vortex shedding effects. The aerodynamic forces per unit span then yield the following:…”

Section: Complex Aerodynamic Admittancementioning

confidence: 99%

Determination of complex aerodynamic admittance of bridge decks under deterministic gusts using the Vortex Particle Method

Kavrakov

Argentini

Omarini

et al. 2019

Journal of Wind Engineering and Industrial Aerodynamics

View full text Add to dashboard Cite

The accurate description of the aerodynamic forces due to free-stream turbulence acting on a stationary bridge deck represents a challenging task. This paper presents a Computational Fluid Dynamics (CFD) approach based on the two-dimensional (2D) Vortex Particle Method (VPM) for simulation of a six-component complex aerodynamic admittance. Deterministic free-stream turbulence is simulated by modeling the wakes of two fictitious pitching airfoils with vortex particles. For out-of-or in-phase sinusoidal oscillations of the airfoils, a longitudinal or vertical sinusoidal gust is obtained along the centerline, respectively. A closed-form solution, based on an existing mathematical model, is deduced to relate the gust amplitudes and vortex particles' circulation. Positioning a section downstream of the particle release locations yields sinusoidal buffeting forces. The complex aerodynamic admittance is then determined as a transfer function between the buffeting forces and the deterministic free-stream turbulence. A verification of the method is performed for the complex Sears' admittance of a flat plate. Finally, the CFD method is validated against wind tunnel tests for a streamlined bridge deck. The results from both, verification and validation, yielded a good agreement. Applications of the presented method are foreseen in the scope of buffeting analyses of line-like structures under the strip assumption.

show abstract

“…Although this method is not affected by the geographical environment, accurate models must be built, and the cost can be extremely expensive. With the development of theoretical studies and computer technology, simulation experiments have been increasingly used to study the effects of various factors on bridge components at the initial stage of the research work to reduce the number of field measurements and tunnel tests [17,18]. Field measurements and tunnel tests are usually used for final validation.…”

Section: Introductionmentioning

confidence: 99%

Wind‐Induced Vibration Response of an Inspection Vehicle for Main Cables Based on Computer Simulation

Zhang

Wang

Guo

et al. 2019

Shock and Vibration

View full text Add to dashboard Cite

This paper presents a simulation approach based on the finite element method (FEM) to analyze the wind-induced vibration response of an inspection vehicle for main cables. First, two finite element (FE) models of a suspension bridge and a main cable-inspection vehicle coupled system are established using MIDAS Civil software and ANSYS software, respectively. Second, the mean wind speed distribution characteristics at a bridge site are analyzed, and the wind field is simulated based on the spectral representation method (SRM). Third, a modal analysis and a wind-induced vibration response transient analysis of the suspension bridge FE model are completed. Fourth, the vibration characteristics of the inspection vehicle are analyzed by applying fluctuating wind conditions and main cable vibration displacements in the main cable-inspection vehicle coupled FE model. Finally, based on the ISO2631-1-1997 standard, a vehicle ride comfort evaluation is performed. The results of the suspension bridge FE modal analysis are in good accordance with those of the experimental modal test. The effects of the working height, number of nonworking compressing wheels, and number of nonworking driving wheels during driving are discussed. When the average wind speed is less than 13.3 m/s, the maximum total weighted root mean square acceleration (av) is 0.1646 m/s2 and the vehicle ride comfort level is classified as “not uncomfortable.” This approach provides a foundation for the design and application of inspection vehicles.

show abstract

Cross-spectral recognition method of bridge deck aerodynamic admittance function

Cited by 19 publications

References 21 publications

Aerodynamic admittance influence on buffeting performance of suspension bridge with streamlined deck

Aerodynamic admittance influence on buffeting performance of suspension bridge with streamlined deck

Determination of complex aerodynamic admittance of bridge decks under deterministic gusts using the Vortex Particle Method

Wind‐Induced Vibration Response of an Inspection Vehicle for Main Cables Based on Computer Simulation

Contact Info

Product

Resources

About