日本風工学会論文集
Online ISSN : 1349-340X
Print ISSN : 1349-3507
ISSN-L : 1349-340X
45 巻 , 3 号
[No. 164]
選択された号の論文の3件中1~3を表示しています
論文
  • 南雲 洋介, 石原 孟
    2020 年 45 巻 3 号 p. 79-92
    発行日: 2020/07/31
    公開日: 2021/01/24
    ジャーナル フリー
    In this study, uncertainties of aerodynamic force, gravitational force, excessive centrifugal force and lateral vibration induced inertial force acting on the train cars are investigated based on the measured data. A performance function is then proposed based on the reliability theory and the safety indexes are assessed when the train operation regulations are performed. The code calibration is carried out to obtain an acceptable safety index and a formula with partial factors is proposed to calculate critical wind speeds of overturning. Finally, the safety indexes for several train operation conditions are assessed based on the critical wind speed of overturning predicted by three formulas. It is found that the safety indexes obtained by the proposed formula are nearly constant values, while those by the conventional formula show different values for different train operation conditions.
  • 団栗 直希, 西嶋 一欽
    2020 年 45 巻 3 号 p. 93-102
    発行日: 2020/07/31
    公開日: 2021/01/24
    ジャーナル フリー
    For the design of structures against wind-induced fatigue not only maximum wind speed but also the time series of wind speed and direction are generally required. Currently, no rationale exists for selecting realistic typhoons to be used for determining such time series for the use of the design. Further, it is not known on how the selection of these typhoons affect the evaluation of the accumulated fatigue damages of structural components. Therefore, this study first proposes a concept and methodology for identifying most-likely typhoon (ML typhoon) with a given hazard level specified in terms of maximum wind speed. Then, using the ML typhoon and other likely typhoons, which together constitute a set of realistic typhoons, characteristics of the time series of wind speed and wind direction with given hazard levels are investigated. Thereafter, a sensitivity analysis is conducted in order to evaluate the variation of the accumulated fatigue damages induced by those typhoons, taking its basis with a hypothetical seismically base isolated building. It is found that significant difference in the evaluated accumulated fatigue damages are observed for typhoons with a common hazard level and the same likelihood. This implies selecting the design typhoon(s) requires more care not only for the maximum wind speed but also other characteristics of typhoons.
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