| 引用本文: | 郑朝荣,张侃,刘昭,武岳,陈文礼.千米高度偏转风场风洞模拟技术研究[J].哈尔滨工业大学学报,2019,51(12):71.DOI:10.11918/j.issn.0367-6234.201902072 |
| ZHENG Chaorong,ZHANG Kan,LIU Zhao,WU Yue,CHEN Wenli.Wind tunnel simulation of a thousand-meter high twisted wind flow[J].Journal of Harbin Institute of Technology,2019,51(12):71.DOI:10.11918/j.issn.0367-6234.201902072 |
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| 千米高度偏转风场风洞模拟技术研究 |
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郑朝荣1,2,张侃1,3,刘昭1,2,武岳1,2,陈文礼1,2
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(1.结构工程灾变与控制教育部重点实验室(哈尔滨工业大学), 哈尔滨 150090; 2.土木工程智能防灾减灾工业和信息化部 重点实验室(哈尔滨工业大学), 哈尔滨 150090;3.中国建筑科学研究院, 北京 100013)
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| 摘要: |
| 为研究超高层建筑的偏转风效应,以风场实测所得的指数律平均风速剖面和Ekman螺线型平均风向剖面以及《建筑结构荷载规范》中的湍流度剖面作为目标风场特性,采用自主设计的导流板系统并结合传统被动模拟装置成功模拟了缩尺比为1∶1 000的千米高度偏转风场,分析了不同装置的调节规律.结果表明:模拟所得的平均风速剖面符合指数律,风速剖面指数约为0.09；平均风向剖面与Ekman螺线吻合很好,最大误差不超过1.5°；湍流度剖面基本处于“荷载规范”C类与D类地貌的湍流度剖面之间.以圆盘中心为基准点,偏转风场在顺流向-0.5~2 m、横流向-0.75~0.75 m范围内均匀性良好.模拟所得的千米高度偏转风场可为后续研究偏转风作用下千米级超高层建筑的风荷载和风致响应特性、评估偏转风效应奠定基础. |
| 关键词: 千米高度偏转风场 风洞试验 导流板系统 Ekman螺线 风向偏转角 |
| DOI：10.11918/j.issn.0367-6234.201902072 |
| 分类号:TU973.213 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51578186)；中国建筑股份有限公司科研基金(CSCEC-2015-Z-39) |
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| Wind tunnel simulation of a thousand-meter high twisted wind flow |
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ZHENG Chaorong1,2,ZHANG Kan1,3,LIU Zhao1,2,WU Yue1,2,CHEN Wenli1,2
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(1.Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, Harbin 150090, China; 2.Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters (Harbin Institute of Technology), Ministry of Industry and Information Technology, Harbin 150090, China; 3.China Academy of Building Research, Beijing 100013, China)
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| Abstract: |
| To investigate the effect of the twisted wind flow on the wind effects of megatall buildings, a modified passive simulation technology, i.e., a combination of a self-developed vane system and the traditional passive simulation devices, is developed to simulate the twisted wind flow with a length scale of 1∶1 000. The mean wind speed and wind direction profiles determine by the field measurement, and the turbulence intensity profiles stipulated in the Chinese Load Code are determined to be the target wind characteristics for the thousand-meter high twisted wind flow. Then the effects of different devices on the twisted wind flow characteristics are analyzed in detail. Results show that the mean wind speed profile for the simulated twisted wind flow followed the power law with an exponent of 0.09, and the mean wind direction profile agrees well with the Ekman spiral with a maximum error of 1.5°. The simulated turbulence intensity profile fluctuate within those of the exposure categories C and D in Chinese Load Code, indicating the reasonability of the results. A good consistent wind property is obtained in an area of 2.5×1.5 m2 around the center of the turntable with a range of -0.5[WT5,6”] — 2 m in the streamwise direction and -0.75[WT5,6”] — 0.75 m in the span wise direction. Thus, the simulated twisted wind flow can provide a solid basis for the further study of the characteristics of wind loads and wind-induced responses for thousand-meter high mega tall buildings, as well as systematic evaluation of the effects of twisted wind flow. |
| Key words: thousand-meter high twisted wind flow wind tunnel test vane system Ekman spiral wind twist angle |
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