Comparison of wind characteristics at different heights of deep-cut canyon based on field measurement

Zhang, Jingyu; Zhang, Mingjin; Li, Yongle; Fang, Chen

doi:10.1177/1369433219868074

Cited by 36 publications

(15 citation statements)

References 43 publications

(52 reference statements)

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“…Due to more complex wind environment in such places, especially in the mountainous areas (J. Zhang, Zhang, Li, & Fang, 2019b;M. Zhang, Yu, Zhang, Wu, & Li, 2019), the effect of crosswind on vehicles is more obvious.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamics of High-Sided Vehicles on Truss Girder Considering Sheltering Effect by Wind Tunnel Tests

Zhang

et al. 2020

BJRBE

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Aerodynamic characteristics of vehicles are directly related to their running safety, especially for the high-sided vehicles. In order to study the aerodynamic characteristics under multiple sheltering conditions, a complex large scale (1:20.4) truss model and three high-sided vehicles including articulated lorry, travelling bus and commercial van models with the same scale were built. The aerodynamic coefficients under various sheltering effects of wind barriers with different heights and porosities, bridge tower and the vehicle on the adjacent lane were measured. According to the results, wind barriers can effectively reduce wind speed behind them, thus decreasing the wind load acting on the vehicle, which causes the decrease of the aerodynamic response of all three vehicles. However, the influence at the leeward side is limited due to installation of central stabilizers. When the vehicle passes through the bridge tower, a sudden change occurs, the aerodynamic coefficients decrease and fluctuate in varying degrees, especially for the commercial van. When the vehicle moves in different lanes behind the bridge tower, the sheltering effect of the tower on the aerodynamic coefficient in Lane 1 is much greater than that in Lane 2. With regard to the interference between two vehicles on the adjacent lanes, the relative windward area between the test vehicle and the interference vehicle greatly affects the aerodynamics of the test vehicle.

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Section: Introductionmentioning

confidence: 99%

Aerodynamics of High-Sided Vehicles on Truss Girder Considering Sheltering Effect by Wind Tunnel Tests

Zhang

et al. 2020

BJRBE

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“…In the last few decades, for the innovative tools for understanding and the optimization of design and assessment of structural health, the modal parameter identification is becoming more and more important [1]. e structural modal parameters, which could affect the design of structures, include natural frequencies, damping ratios, and mode shape vectors [2,3]. e development of related technology has a very positive significance for the bridge structure in the complex environment [4].…”

Section: Introductionmentioning

confidence: 99%

Improved Continuous Wavelet Transform for Modal Parameter Identification of Long-Span Bridges

Zhang

Huang

et al. 2020

Shock and Vibration

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Accurate and timely identification of modal parameters of long-span bridges is important for bridge health monitoring and wind tunnel tests. Wavelet analysis is one of the most advantageous methods for identification because of its good localization characteristics in both time and frequency domain. In recent years, the wavelet method has been applied more frequently in parameter identification of linear and nonlinear systems. In this article, based on wavelet ridges and wavelet skeleton, the improved modal parameter identification method was studied. To find the appropriate time-frequency resolution, an optimal wavelet basis design principle based on minimum Shannon entropy was proposed. Aiming at endpoint effect in wavelet transform, a prediction continuation method based on support vector machine (SVM) was proposed, which can effectively suppress the endpoint effect of the extended samples. In view of the fact that the ridges of metric matrices obtained by the traditional crazy climber algorithm cannot fully reflect the distribution of ridges of modulus value matrices of wavelet coefficients, an improved high-precision crazy climber algorithm was put forward to accurately identify the position of the ridge of wavelet coefficients. Finally, taking a long-span cable-stayed bridge and a long-span suspension bridge as the engineering background, improved continuous wavelet transform (CWT) was applied to modal parameter identification of bridge under ambient excitation. The modal parameters such as modal frequency, damping ratio, and mode shape were obtained. Compared with the calculation value of the numerical simulation of long-span cable-stayed bridge and wind tunnel test of long-span suspension bridge, the reliability of CWT for modal parameter identification of long-span bridges under ambient excitation was verified.

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“…Guo et al (2019b, 2019c) conducted a large number of wind tunnel tests on the iced hangers of the suspension bridge; they analyzed the effects of different wind attack angles and different ice shapes on the aerodynamic performance of the hangers. However, the wind tunnel test has some disadvantages, such as long cycle, high cost, and difficult visualization of flow field (Dalgliesh and Surry, 2003; Zhang et al, 2017). With the development of computational fluid dynamics (CFD), the advantages of high-computational efficiency and low cost of numerical simulation are becoming increasingly prominent (Guo et al, 2019a).…”

Section: Introductionmentioning

confidence: 99%

Study on wind load shape factor of long-span stadium roof

Guo

Zhu

2020

Advances in Structural Engineering

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A long-span stadium roof has always been a wind load sensitive system, given its usual complex curved surface. However, there is no definite method for calculating the wind load shape factor of the complex building in the code. Based on this, the standard [Formula: see text] model was applied to the computational fluid dynamics numerical simulation of a long-span stadium roof at the wind attack angles of 0°–180°. The pressure distribution on the top and bottom surfaces of the stadium roof and the wind load shape factor were obtained by numerical simulation. The results show that the negative pressure was dominant on the top surface of the roof and the positive pressure was dominant on the bottom surface of the stadium at the wind attack angle of 0°. The ring-shaped curtain wall made the wind field environment more complicated, mainly under the wind attack angles of 45° and 180°. Because of the dip angles at both ends of the roof, the wind pressure distribution at both ends of the roof was opposite to the main region. The maximum wind load shape factors of each region were negative. In addition, the maximum wind load shape factor was at 45°, which was −1.1. The maximum wind load shape factors in regions of R13–R19 were larger, which should be paid attention in design stage. In general, the wind load shape factors were large in the central region and small at both ends. The wind load shape factors of the roof were bounded by 90°, showing an anti-symmetric trend.

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Comparison of wind characteristics at different heights of deep-cut canyon based on field measurement

Cited by 36 publications

References 43 publications

Aerodynamics of High-Sided Vehicles on Truss Girder Considering Sheltering Effect by Wind Tunnel Tests

Aerodynamics of High-Sided Vehicles on Truss Girder Considering Sheltering Effect by Wind Tunnel Tests

Improved Continuous Wavelet Transform for Modal Parameter Identification of Long-Span Bridges

Study on wind load shape factor of long-span stadium roof

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