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中国沙漠 ›› 2025, Vol. 45 ›› Issue (1): 32-43.DOI: 10.7522/j.issn.1000-694X.2024.00090

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沙尘暴环境中低矮建筑风压特性的数值研究

胡荻1,2a(), 黄宁2a,2b, 裴斌斌2a,2b, Pakzad Rezaali2a,2b, 张洁2a,2b()   

  1. 1.新疆农业大学 水利与土木工程学院,新疆 乌鲁木齐 830002
    2a.兰州大学,西部灾害与环境力学教育部重点实验室,甘肃 兰州 730000
    2b.兰州大学,土木工程与力学学院,甘肃 兰州 730000
  • 收稿日期:2024-05-20 修回日期:2024-07-10 出版日期:2025-01-20 发布日期:2025-01-13
  • 通讯作者: 张洁
  • 作者简介:张洁(E-mail: zhang-j@lzu.edu.cn
    胡荻(1988─),女,四川达州人,博士研究生,研究方向为风沙环境力学、结构抗风与抗风沙。E-mail: hud20@xjau.edu.cn
  • 基金资助:
    国家重点研发计划项目(2023YFF1304203);国家自然科学基金项目(42376232);新疆维吾尔自治区自然科学基金项目(2024D01B43)

Numerical simulation study on the wind pressure characteristics of low-rise buildings in sandstorm environment

Di Hu1,2a(), Ning Huang2a,2b, Binbin Pei2a,2b, Pakzad Rezaali2a,2b, Jie Zhang2a,2b()   

  1. 1.College of Hydraulic and Civil Engineering,Xinjiang Agricultural University,Urumqi 830002,China
    2a.Ministry of Education Key Laboratory of Mechanics on Disaster and Environment in Western China /, Lanzhou University,Lanzhou 730000,China
    2b.College of Civil Engineering and Mechanics, Lanzhou University,Lanzhou 730000,China
  • Received:2024-05-20 Revised:2024-07-10 Online:2025-01-20 Published:2025-01-13
  • Contact: Jie Zhang

摘要:

基于欧拉-拉格朗日模型研究了风沙环境中低矮建筑的风压分布特征。结果表明:风场中沙颗粒的存在减小了平均风速,增大脉动风速,沙粒运动使小尺度涡的能量增加;与净风场相比,挟沙风场中的平均风压系数无明显变化,脉动风压系数增大显著;沙粒的扰动使湍流脉动增强、气流不稳定性增加,屋面的极值风压系数增大6%~10%,且屋面测点间的风压相关性有增大趋势,局部联动出现负压极值而造成围护结构破坏的概率增加;0°和45°风向角模型的非高斯区域均增大50%以上,因此沙尘暴环境中有更多区域的围护结构易发生局部撕裂破坏。

关键词: 低矮建筑, 沙尘暴, 风沙两相流, 拉格朗日粒子追踪法, 风压系数

Abstract:

Based on Eulerian-Lagrangian method, the wind pressure characteristics of low-rise buildings in sand-laden wind were studied. The results show that the motion of sand particles weakens the mean wind speed, while strengthens the fluctuation of wind, representing as the increasing energy of small-scale vortices. The mean wind pressure coefficients in the sand-laden wind have no obvious change compared with the results of the clean wind, but the fluctuating pressure coefficients increase obviously. Due to the enhancement of turbulent pulsation in the sand-laden wind, the peak wind pressure coefficients on the roof increases by 6% to 10%. Moreover, the spatial-correlation of wind pressure increases, which raises the probability of local-linkage peak negative pressures and results in damage of the envelope structures. The area with non-Gaussian characteristics for 0° and 45° wind angle models in the sand-laden wind is significantly enhanced by more than 50%, meaning that more local-tearing-failure of envelope structures may occur in a sandstorm.

Key words: low-rise buildings, sandstorm, wind sand two-phase flow, Lagrangian particle tracking method, wind pressure coefficient

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