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Wind Characteristics of Typhoon and Its Effect on Structures

台风的风特性及其对结构的影响

基本信息

批准号：
63460173
负责人：
KATSURA J
金额：
$ 3.97万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63460173/
关键词：
Strong Wind Wind Pressure Static Pressure Wind Tunnel Test Vortex Tatsumaki Damage Survey Pressure Field 自動計測多点同時測定傾斜管マノメータ

项目摘要

Natural wind characteristics under strong wind and its effect on structures were studied. The results are summarized as follows.1. Field observations of strong wind : The horizontal distribution of space co-relation coefficients was investigated in the atmospheric surface layer at Shionomisaki Wind Effect Laboratory Kyoto University. The observational network of wind sensors was arranged to form a two-dimensional extension in the horizontal plane. The shape of the distribution of the correlation coefficients was approximated by a group of concentric ellipses.2. Model experiments under natural wind : Wind pressure measurements were carried out under the highly turbulent and gusty wind using a lowrise building model. The slight non-uniformity of the gust produced the unsymmetrical flow pattern rround the symmetrical model. The pressure measuring system combined the absolute pressure transducers with the multi-channel tube manometer was successful to detect the change of the pressure fiel … More d in detail.3. Development of a detector of static pressure : The feasibility of a omnidirectional probe of the static pressure in the atmospheric boundary layer was investigated using the internal pressure of a perforated globe with circular rises corresponding to 32-hedron and the dynamic pressure observed by an anemometer. This detector of polyhedron type is hopeful, if the number of facets increases and the frequency response of the internal pressure is measured elaborately.4. Experiments in boundary layer wind tunnel : Experimental investigations of the vortical structure formed by the separated shear layer around square section prisms of various aspect ratios were carried out in the boundary layer wind tunnel at Desaster Prevention Research Institute Kyoto University. Flow visualizations using dry-iced mist have also been done to clarify the position of the first vortex formation, vortex street spacings and the convection velocity for the prisms of various heights. The vortical structures in the wake were examined by transforming the pressure field on the body and floor surfaces surfaces into vorticity field using a simple Rankine vortex representation.5. Survey of damage caused by strong wind : Five surveys of strong wind damage due to tatsumaki were performed. The damages are more complicated than those due to typhoon because the damages were caused not only by strong wind but also by rapid change of atmospheric pressure or suck up. Detailed investigations will be need to clarify those phenomena. Less

研究了大风作用下的自然风特性及其对结构的影响。研究结果总结如下：1.研究成果。大风的现场观测：京都大学Shionomisaki风效应实验室调查了大气表层空间相关系数的水平分布。风传感器的观测网络被布置成在水平面上的二维延伸。相关系数的分布形状近似为一组同心椭圆。自然风作用下的模型试验：利用一个低层建筑模型，在强湍流和阵风作用下进行了风压测量。阵风的轻微不均匀导致了对称模型周围的非对称流态。采用绝对压力传感器与多通道管式压力计相结合的压力测量系统，成功地检测到了压力场…的变化更多的细节。静态压力探测器的研制：利用与32-Hedron相对应的圆形隆起的穿孔球体的内部压力和风速计观测到的动态压力，研究了全方位探测大气边界层中静态压力的可行性。如果小面数目增加，并且详细测量内压的频率响应，这种多面体类型的探测器是有希望的。边界层风洞实验：在京都大学防灾研究所的边界层风洞中，对不同纵横比的方形截面棱柱周围分离的剪切层形成的旋涡结构进行了实验研究。此外，还利用干冰雾进行了流动显示，以明确第一个涡旋的形成位置、涡街间距和不同高度棱柱的对流速度。采用简单的朗肯旋涡表示法，将机身和地板表面的压力场转化为涡量场，研究了尾流中的旋涡结构。对大风造成的损失进行了调查：进行了五次对多崎造成的强风破坏的调查。台风造成的破坏比台风造成的破坏要复杂得多，因为破坏不仅是由大风造成的，也是由于气压的快速变化或吸力造成的。需要进行详细的调查才能澄清这些现象。较少