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Study of Spatial Distribution of Wind Speeds at a Bridge Site in a Coastal Open Area
It is very important to determine the reasonable design wind speed at the bridge site in a coastal open area for the study of wind resistance performance of long-span bridges. Based on the engineering background of the Hongqimen Grand Bridge in Foshan City, Guangdong Province, taking the center 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 was designed, and the terrain, vegetation, and buildings within a radius of 1 km were simulated. Then, the wind speed distribution at the bridge site in the coastal open area was studied using a terrain model wind tunnel test. Afterwards, conservatively selecting the midspan 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 were modified. Finally, the concept of landform partitioning was put forward first and the practical analysis process was given. According to the weight of the geomorphic area and the weight of the relative position of the measuring point, the influence of nonuniform local landform and its relative position on the surface roughness coefficient was studied quantitatively. The result shows that (1) in the coastal open area, the wind speed profiles of different wind directions matched well with the specification of the recommended power exponent law, the distribution of surface roughness coefficients obtained from the fitting test data was relatively concentrated, the correlation was strong, and the surface roughness coefficients under most working conditions did 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 the wind speed profile; (2) the corrected wind speed is 1.7% better than the value obtained using the conventional method, and the recommended value of the design wind speed at the bridge site is given; and (3) the geomorphic weight is 16% higher than the position weight. The study results are beneficial to refine the reasonable value of surface roughness in the coastal open area.
Study of Spatial Distribution of Wind Speeds at a Bridge Site in a Coastal Open Area
It is very important to determine the reasonable design wind speed at the bridge site in a coastal open area for the study of wind resistance performance of long-span bridges. Based on the engineering background of the Hongqimen Grand Bridge in Foshan City, Guangdong Province, taking the center 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 was designed, and the terrain, vegetation, and buildings within a radius of 1 km were simulated. Then, the wind speed distribution at the bridge site in the coastal open area was studied using a terrain model wind tunnel test. Afterwards, conservatively selecting the midspan 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 were modified. Finally, the concept of landform partitioning was put forward first and the practical analysis process was given. According to the weight of the geomorphic area and the weight of the relative position of the measuring point, the influence of nonuniform local landform and its relative position on the surface roughness coefficient was studied quantitatively. The result shows that (1) in the coastal open area, the wind speed profiles of different wind directions matched well with the specification of the recommended power exponent law, the distribution of surface roughness coefficients obtained from the fitting test data was relatively concentrated, the correlation was strong, and the surface roughness coefficients under most working conditions did 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 the wind speed profile; (2) the corrected wind speed is 1.7% better than the value obtained using the conventional method, and the recommended value of the design wind speed at the bridge site is given; and (3) the geomorphic weight is 16% higher than the position weight. The study results are beneficial to refine the reasonable value of surface roughness in the coastal open area.
Study of Spatial Distribution of Wind Speeds at a Bridge Site in a Coastal Open Area
J. Highway Transp. Res. Dev. (English Ed.)
Wang, Jun (author) / Li, Jia-wu (author) / Xiao, Tian-bao (author)
2022-12-01
Article (Journal)
Electronic Resource
English
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