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- 저자 : Jiadong Zeng (검색결과 3 건)
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Spatial Distribution of Gusty Loads on a Rectangular Prism in Boundary Layer Flows
Jiadong Zeng,Mingshui Li,Shaopeng Li,Ruwei Ma 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.8
The pressure fluctuations acting on a stationary rectangular prism with cross configuration (2:1/1:2) are investigated by windtunnel testing. The synchronous surface pressures on the rigid model were measured in simulated atmospheric boundary layer flowand the unsteady forces were calculated by numerical integral of surface pressures. The effects of the wind fields and the model’s sideratio on the aerodynamic coefficients, spectral characteristics and spatial correlation of aerodynamic loading were investigated. Themain purpose of this study is to further analyze the spatial structure of the fluctuating wind loads acting on a rectangular prism as wellas to use the cross correlation coefficient and coherence function to explore their distribution trends. The results show that the alongwindgust loading is consistent with the longitudinal turbulence and the across-wind aerodynamic force is mainly induced by thevortex-shedding, recirculation and reattachment of separation shear layers on the lateral sides. In practical applications, the Strouhalnumber is approximately constant along the height. Extended empirical coherence models of the fluctuating along-wind and acrosswindloads are proposed with consideration to the effects of wind fields, the structure characteristics and dimensions of the prism andlength scale.
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Aerostatic load on the deck of cable-stayed bridge in erection stage under skew wind
Shaopeng Li,Mingshui Li,Jiadong Zeng,Haili Liao 한국풍공학회 2016 Wind and Structures, An International Journal (WAS Vol.22 No.1
In conventional buffeting theory, it is assumed that the aerostatic coefficients along a bridge deck follow the strip assumption. The validity of this assumption is suspect for a cable-stayed bridge in the construction stages, due to the effect of significant aerodynamic interference from the pylon. This situation may be aggravated in skew winds. Therefore, the most adverse buffeting usually occurs when the wind is not normal to bridge axis, which indicates the invalidity of the traditional “cosine rule”. In order to refine the studies of static wind load on the deck of cable-stayed bridge under skew wind during its most adverse construction stage, a full bridge ‘aero-stiff’ model technique was used to identify the aerostatic loads on each deck segment, in smooth oncoming flow, with various yaw angles. The results show that the shelter effect of the pylon may not be ignored, and can amplify the aerostatic loading on the bridge deck under skew winds (10º-30º) with certain wind attack angles, and consequently results in the “cosine rule” becoming invalid for the buffeting estimation of cable-stayed bridge during erection for these wind directions.
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Aerostatic load on the deck of cable-stayed bridge in erection stage under skew wind
Li, Shaopeng,Li, Mingshui,Zeng, Jiadong,Liao, Haili Techno-Press 2016 Wind and Structures, An International Journal (WAS Vol.22 No.1
In conventional buffeting theory, it is assumed that the aerostatic coefficients along a bridge deck follow the strip assumption. The validity of this assumption is suspect for a cable-stayed bridge in the construction stages, due to the effect of significant aerodynamic interference from the pylon. This situation may be aggravated in skew winds. Therefore, the most adverse buffeting usually occurs when the wind is not normal to bridge axis, which indicates the invalidity of the traditional "cosine rule". In order to refine the studies of static wind load on the deck of cable-stayed bridge under skew wind during its most adverse construction stage, a full bridge 'aero-stiff' model technique was used to identify the aerostatic loads on each deck segment, in smooth oncoming flow, with various yaw angles. The results show that the shelter effect of the pylon may not be ignored, and can amplify the aerostatic loading on the bridge deck under skew winds ($10^{\circ}-30^{\circ}$) with certain wind attack angles, and consequently results in the "cosine rule" becoming invalid for the buffeting estimation of cable-stayed bridge during erection for these wind directions.
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