兰州理工大学学报

兰州理工大学学报 ›› 2022, Vol. 48 ›› Issue (1): 143-149.

• 建筑科学 • 上一篇    下一篇

户外大型三面单立柱广告牌抗风性能气动优化

杨文伟*1,2, 罗进财1, 杜亚男1   

  1. 1.宁夏大学 土木与水利工程学院, 宁夏 银川 750021;
    2.宁夏土木工程防震减灾工程技术研究中心,宁夏 银川 750021
  • 收稿日期:2019-06-19 出版日期:2022-02-28 发布日期:2022-03-09
  • 通讯作者: 杨文伟(1967-),男,宁夏海原人,博士,教授,博导.Email:nxyangww@163.com
  • 基金资助:
    宁夏自然科学基金(2019AAC03004),宁夏高等学校一流学科建设(国内一流建设学科)资助项目(NXYLXK2017A03)

Aerodynamic optimization of outdoor large-scale three-sided single column billboard

YANG Wen-wei1,2, LUO Jin-cai1, Du Ya-nan1   

  1. 1. College of Civil and Hydraulic Engineering,Ningxia University, Yinchuan 750021, China;
    2. Ningxia Center for Research on Earthquake Protection and Disaster Mitigation in Civil Engineering, Yinchuan 750021, China
  • Received:2019-06-19 Online:2022-02-28 Published:2022-03-09

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摘要： 户外大型单立柱广告牌属于风灾易损性结构,为优化其在最不利风向角下风压分布和风阵响应,基于空气动力学原理,利用Fluent分析软件对广告牌结构的风荷载特性进行数值模拟,并与风洞试验结果进行对比,验证了数值模拟的可靠性.在此基础上,基于不同矢跨比设计6种单立柱三面广告牌形状优化方案进行对比分析.结果表明:各面板负风压最大值均出现在侧面及面板边缘处,其绝对值大小为最大正风压值的2倍;对比形状优化后的模型,发现外凸形相对于内凹形而言有明显的减风压优势;当结构为外凸形矢跨比S/L=1/9时,最大正风压和最大负风压值均在1 000 Pa左右,相比平面广告牌,结构所受的压力与吸力作用比较均衡,很大程度上减少了结构上的极值风压,为最优工况.

关键词: 气动优化, 单立柱广告牌, 减风压, 数值模拟, 抗风性能, 矢跨比

Abstract: Outdoor large-scale single-column billboards are wind-damage vulnerable structures. In order to optimize their wind pressure distribution and wind-induced effect under the most unfavorable wind direction angle, based on the aerodynamic principle, the wind load characteristics of the billboard structure are numerically calculated using FLUENT. The simulation was compared with the wind tunnel test results to verify the reliability of the numerical simulation. On this basis, six kinds of single-column three-sided billboard shape optimization schemes were designed based on different sagittal span ratios for comparative analysis. The results show that the maximum negative wind pressure of each panel appears at the side and the edge of the panel, and the absolute value is twice the maximum positive wind pressure value. Comparing with the shape optimized model, it is found that the convex shape has obvious advantages in reducing wind pressure compared with the concave shape. When the structural sagittal span ratio S/L=1/9, the maximum positive wind pressure and the maximum negative wind pressure are both about 1000 Pa. Compared with the plane billboard, the pressure and suction of the structure are more balanced, the structural extreme wind pressure is greatly reduced, which is the optimal working condition.

Key words: Aerodynamic optimization, single column billboard, wind reduction, numerical simulation, wind resistance, span ratio

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