Characteristics of the Wind Environment above Bridge Deck near the Pylon Zone and Wind Barrier Arrangement Criteria

Abstract

Due to the complex arrangement of structural components in the vicinity of bridge pylon zones, the wind environment above bridge decks is very complicated. A sudden change in wind speed exerts an adverse effect on vehicle control stability. In order to investigate the characteristics of the flow field in the vicinity of the bridge pylon, the wind environment near an inverted Y-shaped pylon is studied by experimental and numerical methods. From the flow visualization and the wind speed measurement in the wind tunnel and the numerical simulation created using Fluent software, specific patterns of the direction and magnitude of wind speed at a range of vehicle height above the bridge deck near the pylon zone were observed along the longitudinal direction. This distribution pattern of the wind environment can effectively guide the wind barrier arrangement near the bridge pylon zone. Combined with the two safety evaluation indicators proposed in this paper, the optimal arrangement scheme of wind barriers in the bridge pylon zone of Sutong Bridge is determined. This paper deepens the understanding of the wind environment near the pylon zone and proposes an evaluation method for the wind environment near the pylon zone, which can serve as the basis for wind barrier arrangement in similar research projects.

Combined wind profile characteristics based on wind parameters joint probability model in a mountainous gorge

“…Thus, many researchers have measured different mountainous terrain, including U-shaped gorge (F. , V-shaped gorge (Zhang et al, 2021), Y-shaped river channel (Huang et al, 2019), and others. The results show that the wind field in mountainous areas is greatly constrained by local terrain, which is different from that in open flat areas (Hui et al, 2009;Li et al, 2017;D. Wang et al, 2020).…”

Field-measurement-based local wind field characteristics on bridge deck of truss girder bridges in a deep-cutting gorge bridge site area

“…where u max , t g , v max , t g , and w max , t g denote the maximum average value corresponding to three components (longitudinal, lateral, and vertical wind directions, respectively) of fluctuating wind speed in the gust duration t g ; U ¯ T is the mean wind speed with an interval T = 10 min ( thus, true U ¯ T = U ¯ ); Gust duration t g is generally between 1and 3 s, and t g was selected as 3 s in this paper. 29,30…”

“…where u max, t g , v max, t g , and w max, t g denote the maximum average value corresponding to three components (longitudinal, lateral, and vertical wind directions, respectively) of fluctuating wind speed in the gust duration t g ; U T is the mean wind speed with an interval T = 10 min ( thus, U T = U); Gust duration t g is generally between 1and 3 s, and t g was selected as 3 s in this paper. 29,30 The turbulence intensity is an important parameter to judge the wind field and is also a significant factor affecting the safety of vehicles. 31 Turbulence intensity is defined as the ratio of the root mean square (RMS) of the fluctuating wind speed to the mean wind speed U$ in a given time interval, and can be expressed as follows:…”

Numerical Modeling of Ice Accumulation on Three-Dimensional Bridge Cables under Freezing Rain and Natural Wind Conditions

“…Cable-supported bridges are efficient types of bridges in mountainous areas [7,8]. However, rime ice and glaze ice climate weathers often occur in the mountains, which has a huge impact on the safety of these structures [9].…”