著者

奥田 泰雄 林 泰一 横木 研 丸山 敬

出版者

一般社団法人 日本風工学会

雑誌

風工学シンポジウム論文集 第18回風工学シンポジウム論文集

巻号頁・発行日

pp.000038, 2005 (Released:2005-07-20)

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When Typhoon Maemi passed over the Miyako Island, maximum instantaneous wind speed 74.1 m/s and minimum atmospheric pressure 912 hPa were observed at Miyakojima Local Meteorological Observatory on September 11, 2003. In connection with this high wind, the serious wind damage occurred on the Miyako Island since the 3rd Miyakojima Typhoon in 1968. We already reported on the meteorological situation and the high wind damage in Miyako Islands in some reports. As a result of investigating about the high wind of Typhoon Maemi using meteorological data, such as weather survey data in weather government offices and a weather radar echo charts, it turns out that the high wind were observed under the strong rain band on the west of the ring inside the double eye of the typhoon in this paper. We also classify the damage situation of buildings and structures and compare wind speed records observed at Miyakojima Local Meteorological Observatory with wind loads in Japan Building Code.

著者

野津 剛 日比 一喜 小川 隆申

出版者

一般社団法人 日本風工学会

雑誌

風工学シンポジウム論文集 第18回風工学シンポジウム論文集

巻号頁・発行日

pp.000021, 2005 (Released:2005-07-20)

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Hydrogen energy attracts attention as eco-friendly energy recently. Especially the fuel cell vehicle that uses hydrogen as fuel will be expected as a post gasoline car in the future. However, since hydrogen gas can burn in mixtures with air from very lean to rich, when hydrogen gas leaked from hydrogen refueling station, the danger of causing explosion is high. Therefore, it is necessary to design so that the serious damage for the windowpane and a human body may not be given in case of emergency accident. So, it is important to predict the blast pressure correctly at the time of explosion. But, an explosion experiment has some problems of a site, time, and cost, so that the numerical simulation is needed for highly precise prediction. In this study, we simulate the hydrogen explosion experiment conducted in the past and verify the prediction accuracy.

著者

喜多村 美保 友清 衣利子 前田 潤滋

出版者

一般社団法人 日本風工学会

雑誌

風工学シンポジウム論文集 第18回風工学シンポジウム論文集

巻号頁・発行日

pp.000024, 2005 (Released:2005-07-20)

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It is known that the spread of structural damage is more strongly affected by gust speeds than by maximum wind speeds. The authors have focused on the duration and fluctuation of wind gusts. The results of damage analysis based on the effects of Typhoon Bart in 1999 have indicated that the spread of damage has a higher correlation to the standard deviation of the wind gusts rather than to the intensity of turbulence. Comparisons of the time evolutions of wind records at selected observation points have indicated more serious damage at areas with higher fluctuations of wind speed. Although the above investigation is based on a survey of the damage of only one typhoon, it is suggested that fluctuation intensity as well as the duration of high wind speed is a significant factor in the spread of structural damage.