Wind Engineers, JAWE
Online ISSN : 1883-8413
Print ISSN : 0912-1935
ISSN-L : 0912-1935
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Volume 1986, Issue 27
Displaying 1-5 of 5 articles from this issue
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  • The efficiency of helical strakes for the suppression of vortex excited oscillation and its application of steel stack in use
    Tadayuki SHIMADA, Hiroshi HARA, Hatsuo ISHIZAKI
    1986 Volume 1986 Issue 27 Pages 3-16
    Published: March 31, 1986
    Released on J-STAGE: September 28, 2010
    DOIhttps://doi.org/10.5359/jawe.1986.3
    JOURNAL FREE ACCESS
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    To find out the best configuration of the strakes to suppress the vibration of stackswind tunnel experiments were performed. Based on the results of the test, the helical strakes were fitted to an actual stack.
    The measurement of the vibration of the stack were carried out before and after the installations of the strakes and the designed helical strakes were proved to be successful.
    In the design of the stack with appropriate helical strakes the vortex excited oscillation need not be taken into account. As a result, the structure of the stack can be expected to be more rational than plain stack without strakes.
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  • Rain vibrations of cables in cable-stayed bridge
    Yuichi HIKAMI
    1986 Volume 1986 Issue 27 Pages 17-28
    Published: March 31, 1986
    Released on J-STAGE: September 28, 2010
    DOIhttps://doi.org/10.5359/jawe.1986.17
    JOURNAL FREE ACCESS
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    At the construction stage of a cable-stayed bridge, large amplitude vibrations of the cables are observed for several times. This observed vibration of single cables is an instability phenomenon caused by the combined influence of rain and wind.
    A detailed aerodynamic wind-tunnel investigation shows that, pouring rain on the cable tracks down the cable making water rivulets at upper surface andbottom surface of the cable, and with these two rivulets, the cable cross section becomes aerodynamically unstable.
    Compared with aerolian vibrations, the rain vibration of the cable is a low-frequency high-amplitude vibration.
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  • Wind environment at balcony of high-rise apartment house
    Shuzo MURAKAMI, Kiyotaka DEGUCHI, Takeo TAKAHASHI, Shin-ichi AKABAYASH ...
    1986 Volume 1986 Issue 27 Pages 29-40
    Published: March 31, 1986
    Released on J-STAGE: September 28, 2010
    DOIhttps://doi.org/10.5359/jawe.1986.29
    JOURNAL FREE ACCESS
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    The characteristics of strong wind at the balcony of high-rise apartment house and the shelter effects of wind breaks were mentioned in this paper.
    The measurements of wind speed were carried out at the balconies m a real highrise apartment house with 23 stories by using 12 thermister-typed anemometers. Wind data under various conditions were analysed not only in case of present condition but also in case of remedial actions taken.
    The results were that strong winds (the velocity ratio to the rooftop wind exceeds 0.7) occurred almost only at the corner of balcony, and-that one or two fences were available as wind breaks located appropriately at the corner area.
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  • Research on methods for estimating the distribution of wind force on the ground surface based on the analysis of topography
    Toshio KOIZUMI, Hiroto HAGURA
    1986 Volume 1986 Issue 27 Pages 41-63
    Published: March 31, 1986
    Released on J-STAGE: September 28, 2010
    DOIhttps://doi.org/10.5359/jawe.1986.41
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    It is well known that topography is an important factor that affects wind disasters, the wind on the ground surface that cause the damage to the structures being particularly affected by the topography of the surrounding area.
    This paper concerns research work on methods for estimating the distribution of wind force on the ground surface based on the analysis of topography, which furnishes important data in analyzing wind disasters.
    A case study of this analysis was carried out on Typhoon 7920 with regard to Chiba Prefecture.
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  • Extreme wind speeds for various return periods during rainfall
    Shuzo MURAKAMI, Yoshiteru IWASA, Yasushige MORIKAWA, Noriko CHINO
    1986 Volume 1986 Issue 27 Pages 65-74
    Published: March 31, 1986
    Released on J-STAGE: September 28, 2010
    DOIhttps://doi.org/10.5359/jawe.1986.65
    JOURNAL FREE ACCESS
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    The extreme wind speeds for various return periods during rainfall at six typical meteorological stations in Japan were estimated using the statistical method for extremes.
    The annual maximum figures recorded between 1961 and 1980 at these stations were used in the analysis.
    These extreme values, which were classified according to-the amount of precipitation, were found to be in close accordance with the extreme type 1 distribution. The estimated values were obtained using the multiple regression analysis with two variables; the annual maximum wind speed and the hourly average precipitation.
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