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| Study on Spatial Distribution of Wind Speeds at Bridge Site in Coastal Open Area |
| WANG Jun1,2, LI Jia-wu1,2, XIAO Tian-bao1,2 |
1. School of Highway, Chang'an University, Xi'an Shaanxi 710064, China;
2. Wind Tunnel Laboratory, Chang'an University, Xi'an Shaanxi 710064, China |
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Abstract It is very important to determine the reasonable design wind speed at the bridge site in coastal open area for the study of wind resistance performance of long-span bridges. On the engineering background of Hongqimen Grand Bridge in Foshan City, Guangdong Province, first, taking the centre of the main span of the bridge as the circle center, the topographic model of the bridge site with a geometric scale of 1∶500 is designed, the terrain, vegetation and buildings within a radius of 1 km are simulated. Then, the wind speed distribution at the bridge site in the coastal open area is studied by using terrain model wind tunnel test. Afterwards, conservatively selecting the mid-span measuring point as the research object, and taking the average surface roughness coefficients of different flow directions as the correction parameters, the design wind speed values of the specification method and the weighted average method are modified. Finally, the concept of landform partitioning is put forward firstly and the practical analysis process is given. According to the weight of geomorphic area and the weight of relative position of measuring point, the influence of nonuniform local landform and its relative position on surface roughness coefficient is studied quantitatively. The result shows that (1) in the coastal open area, the wind speed profiles of different wind directions match well with the specification recommended power exponent law, the distribution of surface roughness coefficients obtained from the fitting test data is relatively concentrated, the correlation is strong, and the surface roughness coefficients under most working conditions do not exceed the class B surface roughness coefficient in Wind-resistant Design Specification for Highway Bridges (JTG/ T 3360-01—2018), indicating that the incoming wind direction and the location of measuring points have little influence on the development of wind speed profile; (2) the corrected wind speed is 1.7% better than the value obtained by conventional method, and the recommended value of design wind speed at the bridge site is given; (3) the geomorphic weight is 16% higher than the position weight. The study result is beneficial to refine the reasonable value of surface roughness in the coastal open area.
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Received: 25 June 2021
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| Fund:Supported by the Natural Science Foundation of China(No.51978077) |
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[1] LIU K B, SHEN C, LOUIE K S. A 1000-year History of Typhoon Landfalls in Guangdong, Southern China, Reconstructed from Chinese Historical Documentary Records[J]. Annals of the Association of American Geographers, 2001, 91(3):453-464.
[2] ZHANG Y, WEI K, SHEN Z, et al. Economic Impact of Typhoon-induced Wind Disasters on Port Operations:A Case Study of Ports in China[J]. International Journal of Disaster Risk Reduction, 2020, 50:101719.
[3] PANG Jia-bin. Research on Observation Analysis and Wind Tunnel Simulation of Strong Wind Characteristics in Coastal and Mountainous Regions[D]. Shanghai:Tongji University, 2006. (in Chinese)
[4] XIANG Hai-fan, GE Yao-jun. Modern Theory for Wind Resistant Bridge and Its Application[J]. Mechanics in Engineering, 2007,(1):1-13. (in Chinese)
[5] XIANG Hai-fan. Study on Bridge Wind Enginnering into 21st Century[J]. Journal of Tongji University, 2002,(5):529-532. (in Chinese)
[6] ZAHNG Yue, LIU Jian-xin. Analysis and Calculation of the Design Reference Wind Speed at the Xinjiang Saiwudiege'er Bridge[J]. Journal of Zhengzhou University (Engineering Science), 2008,29(2):132-136. (in Chinese)
[7] DONG Xu-guang, QIU Can, LI Juan, et al. Spatial and Temporal Distribution of Terrastrial Annual Maximum Wind Speed in Shandong from 1981 to 2016[J]. Journal of Marine Meteorology. 2018,38(2):87-95. (in Chinese)
[8] GUO Zeng-wei, YUAN Hang, WANG Xiao-song. Field Measurement Analysis of Wind Turbulence Characteristics at Bridge Site of Qingcaobei Yangtze River[J]., 2018,46(5):12——126. (in Chinese)
[9] HUI Cheng-yu. Characteristics of Measured Wind Field in Western Valley and Its Effect on Bridge Buffeting[D]. Xi'an:Chang'an University, 2018. (in Chinese)
[10] ZHU Zhi-wen, ZHANG Shi-ning, LIU Zhen-qing, et al. CFD Simulation of Wind Field at Bridge Site on Gorge Terrain[J]. Journal of Hunan University (Natural Sciences), 2011,38(10):13-17. (in Chinese)
[11] JING Hong-miao, LIAO Hai-li, ZHOU Qiang, et al. A Numerical Simulation Method for Wind Field Characteristics of Mountainous Valley at Bridge Site[J]. Journal of Vibraion and Shock, 2019,38(16),200-207. (in Chinese)
[12] BAI Hua, LI Jia-wu, LIU Jian-xin. Experimental Study on Wind Field Characteristics of Sanshui River Bridge Site Located in West Valley Region[J], Journal of Vibraion and Shock, 2012,31(1):74-78(in Chinese)
[13] WANG Feng, HE Han-xin, BAI Hua, et al. Wind Parameter Characteristics of a Bridge Located in the Gorge Area[J]. Journal of Nanjing Technology University (Natural Science Edition), 2020,42(3):351-357. (in Chinese)
[14] LI Y L, HU P, XU X Y, et al. Wind Characteristics at Bridge Site in a Deep-cutting Gorge by Wind Tunnel Test[J]. Journal of Wind Engineering & Industrial Aerodynamics, 2017, 160:30-46.
[15] SONG J L, LI J W, FLAY R G J. Field Measurements and Wind Tunnel Investigation of Wind Characteristics at a Bridge Site in a Y-shaped Valley[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2020, 202:104199.
[16] XU Hong-tao, HE Yong, LIAO Hai-li, et al. Experiment of Wind Field in Long-span Bridge Site Located in Mountainous Valley Terrian[J]. Journal of Highway and Transportation Research and Development, 2011,28(7):84-89. (in Chinese)
[17] CHEN T, LI Y, LUAN D, et al. Study of Flow Characteristics in Tunnels Induced by Canyon Wind[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2020, 202:104236.
[18] JTG/T3360-01-2018. Wind-resistant Design Specification for Highway Bridges[S].
[19] BOWEN A J. Modelling of Strong Wind Flows over Complex Terrain at Small Geometric Scales[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2003, 91(12/13/14/15):1859-1871.
[20] HU Feng-qiang. Parameters and Flutter Instability of Suspension Bridges with a Steel Truss Stiffened Girder in Mountainous Regions[D]. Shanghai:Tongji University, 2006. (in Chinese) |
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2022, Vol. 16 
