| 胡阳,李永贵*,严佳慧,全嘉.湍流参数影响下高层建筑风压的不确定性研究[J].实验力学,2023,38(6):771~780 |
| 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：10.7520/1001-4888-22-240 |
| 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(51878271);湖南省自然科学基金项目(2020JJ4302, 2020JJ5176) |
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| 中文摘要: |
| 极值风压是高层建筑围护结构抗风设计的依据，本文利用挡板和粗糙元模拟出《建筑结构荷载规范》(GB 50009-2012)规定的C类风场，以此为基准，保持湍流度基本不变，减小湍流积分尺度得到CL1、CL2风场；保持湍流积分尺度基本不变，增大湍流度得到CI风场。在4类风场下对高层建筑模型均进行了500次重复采样试验，通过试验研究了湍流参数影响下高层建筑风压不确定性的基本规律，并确定了满足工程应用的极值风压所需的采用次数。结果表明，湍流度的增大导致高层建筑极值风压的变异系数增大，而湍流积分尺度对极值风压的变异系数的影响基本可以忽略；风压的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；按《建筑结构可靠度设计统一标准》(GB 50068-2018)的规定，活荷载的分项系数取1.5，以1.5作为目标分项系数，4类风场下均只需单次采样即可获得稳定的极值风压。 |
| 英文摘要: |
| The extreme wind pressure forms the foundation for wind-resistant design of high-rise building envelopes. This study employs rough elements and baffle plates to imitate the class C wind field, in “Load code for the design of building structures” (GB 50009-2012). The class C wind field is taken as a benchmark against which the turbulence intensity (TI) is held while the turbulence integral scale (TIS) is decreased to simulate the CL1 and CL2 wind fields and TIS remains as TI is increased to simulate the CI wind field.Under the four wind field categories, the high-rise building model was subjected to 500 repetitive sampling tests to study the fundamental principles of wind pressure uncertainty in high-rise structures under turbulent conditions. The findings indicate that a rise in TI leads to an increase in the coefficient of variation (CV) of extreme wind pressure for high-rise structures, while the influence of TI on the CV of extreme wind pressure is minimal.The number of samples required to stabilize wind pressure's CV depends on the order of sampling. According to “Unified standard for reliability design of building structures”(GB 50068-2018), the partial safety factor of wind load is set at 1.5 and used as the target partial safety factor. A single sampling is all that is required to obtain the stable extreme wind pressure for all four types of wind fields. |
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