Local wind characteristics on bridge deck of twin-box girder considering wind barriers by large-scale wind tunnel tests

2020 ◽  
Vol 103 (1) ◽  
pp. 751-766
Author(s):  
Jingyu Zhang ◽  
Mingjin Zhang ◽  
Yongle Li ◽  
Yizhe Qian ◽  
Bing Huang
Keyword(s):  
Wind Tunnel ◽  
Large Scale ◽  
Bridge Deck ◽  
Local Wind ◽  
Box Girder ◽  
Wind Tunnel Tests ◽  
Wind Characteristics

DETERMINATION OF FLUTTER DERIVATIVES OF BRIDGE DECKS BY COVARIANCE-DRIVEN STOCHASTIC SUBSPACE IDENTIFICATION

2011 ◽  
Vol 11 (01) ◽  
pp. 73-99 ◽  
Author(s):  
THARACH JANESUPASAEREE ◽  
VIROTE BOONYAPINYO
Keyword(s):  
Wind Tunnel ◽  
Thin Plate ◽  
Bridge Deck ◽  
Bridge Decks ◽  
Subspace Identification ◽  
Plate Model ◽  
Wind Tunnel Tests ◽  
Stochastic Subspace Identification ◽  
Derivatives Of ◽  
Flutter Derivatives

In this paper, the covariance-driven stochastic subspace identification technique (SSI-COV) was presented to extract the flutter derivatives of bridge decks from the buffeting test results. An advantage of this method is that it considers the buffeting forces and responses as inputs rather than as noises. Numerical simulations and wind tunnel tests of a streamlined thin plate model conducted under smooth flows by the free decay and the buffeting tests were used to validate the applicability of the SSI-COV method. Then, the wind tunnel tests of a two-edge girder blunt type of industrial-ring-road (IRR) bridge deck were conducted under smooth and turbulence flows. The flutter derivatives of the thin plate model identified by the SSI-COV technique agree well with those obtained theoretically. The results obtained for the thin plate and the IRR bridge deck are used to validate the reliability and applicability of the SSI-COV technique to various wind tunnel tests and conditions of wind flows. The results also show that for the blunt-type IRR bridge deck, the turbulence wind will delay the onset of flutter, compared with the smooth wind.

Wind tunnel test and numerical simulation of wind characteristics at a bridge site in mountainous terrain

2016 ◽  
Vol 20 (8) ◽  
pp. 1223-1231 ◽  
Author(s):  
Yongle Li ◽  
Xinyu Xu ◽  
Mingjin Zhang ◽  
Youlin Xu
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Bridge Deck ◽  
Angle Of Attack ◽  
Wind Tunnel Test ◽  
Vertical Direction ◽  
Steep Slope ◽  
Mountainous Terrain ◽  
Bridge Site ◽  
Wind Characteristics

Wind tunnel test and computational fluid dynamics simulation were conducted to study the wind characteristics at a bridge site in mountainous terrain. The upstream terrains were classified into three types: open terrain, open terrain with a steep slope close to the bridge, and open terrain with a ridge close to the bridge. Results obtained from the two methods were compared, including mean speed profiles in the vertical direction and variations of wind speed and angle of attack along the bridge deck. In addition, turbulence intensities at the bridge site obtained from wind tunnel test were discussed. For mean speed profiles in the vertical direction, two methods are reasonably close for open terrain, while mountain shielding effects are evident for open terrain with a steep slope for both the methods, but the extents of effects appear different. Wind speed and angle of attack along the bridge deck are mainly influenced by the local terrain. Strong downslope wind is generated at the lee slope for the case of wind normal to top of the ridge. The comparative results are expected to provide useful references for the study of wind characteristics in mountainous terrain in the future.

Wind Tunnel Test Investigation on Sectional Models of Chaotianmen Yangtze River Bridge

2011 ◽  
Vol 201-203 ◽  
pp. 2763-2766
Author(s):  
Cheng Qi Wang ◽  
Zheng Liang Li ◽  
Zhi Tao Yan
Keyword(s):  
Wind Tunnel ◽  
Yangtze River ◽  
Bridge Deck ◽  
Wind Tunnel Test ◽  
Wind Tunnel Tests ◽  
Force Coefficients ◽  
Test Investigation ◽  
Flutter Derivatives

By means of wind tunnel tests on the sectional models of Chaotianmen Yangtze River Bridge, some important results are obtained, including the aerostatic force coefficients with the changing of attack angles, and eight flutter derivatives for the bridge deck. The wind-resistant behavior of the bridge is evaluated.

scholarly journals Wind Tunnel Test on Local Wind Field around the Bridge Tower of a Truss Girder

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jingyu Zhang ◽  
Mingjin Zhang ◽  
Bing Huang ◽  
Yongle Li ◽  
Jiaxin Yu ◽  
...  
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Wind Field ◽  
Large Scale ◽  
Leeward Side ◽  
Local Wind ◽  
Height Range ◽  
Wind Barrier ◽  
Local Wind Field ◽  
Bridge Tower

The aerodynamic performance of vehicles on a bridge deck depends on the local wind field, especially in a region near a bridge tower. This study was carried out on a large-scale (1: 20.4) truss girder, and wind tunnel tests were performed to determine how the wind fields were affected by the bridge tower in the presence of different wind barriers. The wind barrier parameters significantly affect the wind field. Wind barriers should be sufficiently high to provide a wide protection range and have relatively small porosities to reduce the wind speed. The opening form of the wind barrier should also be considered, where a circular-holed form reduces the wind speed and turbulence more than a horizontal-slatted form. The wind field is affected by structures and bridge towers on the deck. A turning point in the wind speed occurs at a measurement point near the bridge tower, and this point gradually moves upward towards lanes on the leeward side of the bridge. The equivalent wind speed is significantly reduced over a four-meter height range because of shadowing from the bridge tower and the wind barrier.

scholarly journals Assessing the Capability of Computational Fluid Dynamics Models in Replicating Wind Tunnel Test Results for the Rose Fitzgerald Kennedy Bridge

CivilEng ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 1065-1090
Author(s):  
Yuxiang Zhang ◽  
Philip Cardiff ◽  
Fergal Cahill ◽  
Jennifer Keenahan
Keyword(s):  
Wind Tunnel ◽  
Bridge Deck ◽  
Wind Tunnel Test ◽  
Verification And Validation ◽  
Bridge Engineering ◽  
Test Results ◽  
Cfd Model ◽  
Cfd Simulations ◽  
Wind Tunnel Tests ◽  
The Rose

Despite its wide acceptance in various industries, CFD is considered a secondary option to wind tunnel tests in bridge engineering due to a lack of confidence. To increase confidence and to advance the quality of simulations in bridge aerodynamic studies, this study performed three-dimensional RANS simulations and DESs to assess the bridge deck aerodynamics of the Rose Fitzgerald Kennedy Bridge and demonstrated detailed procedures of the verification and validation of the applied CFD model. The CFD simulations were developed in OpenFOAM, the results of which are compared to prior wind tunnel test results, where general agreements were achieved though differences were also found and analyzed. The CFD model was also applied to study the effect of fascia beams and handrails on the bridge deck aerodynamics, which were neglected in most research to-date. These secondary structures were found to increase drag coefficients and reduce lift and moment coefficients by up to 32%, 94.3%, and 52.2%, respectively, which emphasized the necessity of including these structures in evaluations of the aerodynamic performance of bridges in service. Details of the verification and validation in this study illustrate that CFD simulations can determine close results compared to wind tunnel tests.

scholarly journals A Quick Assessment and Optimization Method for a Flutter Aerodynamic Measure of a Typical Flat Box Girder

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Feng Wang ◽  
Chuan Xiong ◽  
Zijian Wang ◽  
Congmin Guo ◽  
Hua Bai ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Wind Tunnel ◽  
Energy Input ◽  
Test Procedure ◽  
Optimization Method ◽  
Box Girder ◽  
Wind Tunnel Tests ◽  
Long Span Bridges ◽  
Long Span ◽  
Quick Assessment

Flutter is one of the most serious wind-induced vibration phenomena for long-span bridges and may cause the collapse of a bridge (e.g., the Old Tacoma Bridge, 1940). The selection and optimization of flutter aerodynamic measures are difficult in wind tunnel tests. It usually takes a long time and consumes more experimental materials. This paper presents a quick assessment and design optimization method for the flutter stability of a typical flat box girder of the long-span bridges. Numerical analysis could provide a reference for wind tunnel tests and improve the efficiency of the test process. Based on the modal energy exchange in the flutter microvibration process, the global energy input and local energy input are analyzed to investigate the vibration suppression mechanism of a flat steel box girder with an upper central stabilizer. Based on the comparison between the experimental and numerical data, a quick assessment method for the optimization work is proposed. It is practical to predict the effects of flutter suppression measures by numerical analysis. Thus, a wind tunnel test procedure for flutter aerodynamic measures is proposed which could save time and experimental materials.

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