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| 湍流参数影响下高层建筑风压的不确定性研究 |
| Study on the uncertainty of wind pressure of high rise buildings under the influence of turbulence parameters |
| 投稿时间：2022-09-25 修订日期：2022-12-23 |
| DOI： |
| 中文关键词: 高层建筑 湍流度 湍流积分尺度 多次独立采样 变异系数 |
| 英文关键词:high rise building Turbulence intensity Turbulence integral scale Multiple independent sampling Coefficient of variation |
| 基金项目:国家自然科学基金项目（面上项目，考虑湍流积分尺度影响的超高层建筑精细化抗风设计方法的多尺度研究，51878271），湖南省自然科学基金项目（强/台风作用下方形截面超高层建筑表面风压特性的现场实测研究，2020JJ4302；角部气动措施下超高层建筑风振控制机理及其修正数学模型，2020JJ5176） |
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| 中文摘要: |
| 利用多排交错矩形挡板和粗糙元模拟出了湍流度和湍流积分尺度单独变化的四类边界层风场,在四类风场下对方形截面高层建筑均进行了500次重复采样试验,基于变异系数研究了风压系数的不确定性和获得稳定风压系数所需得采样次数。结果表明,湍流度的增大导致高层建筑极值风压系数的变异系数增大,湍流积分尺度对极值风压系数变异系数的影响基本可以忽略；风压系数变异系数达到稳定所需的样本数量主要取决于采样顺序,与湍流参数没有关联性；以1.5为目标分项系数,只需单次采样即可获得稳定的风压。 |
| 英文摘要: |
| Four types of boundary layer wind fields with independently varying turbulence intensity and turbulence integral scale are simulated by using multiple rows of staggered rectangular baffles and rough elements. 500 repeated sampling tests are carried out for square section high-rise buildings under the four types of wind fields. Based on the COV(coefficient of variation), the uncertainty of wind pressure coefficient and the number of samples required to obtain a stable wind pressure coefficient are studied. The results show that the COV of extreme wind pressure coefficient increases with the increase of turbulence intensity, and the influence of turbulence integral scale on the COV of extreme wind pressure coefficient can be ignored; The number of samples needed for the COV of wind pressure coefficient to reach stability mainly depends on the sampling sequence, and has no correlation with turbulence parameters; Taking 1.5 as the target sub coefficient, stable wind pressure can be obtained only by a single sampling. |
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