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국내 최대 기계 및 로봇 연구정보
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  • Fortus 450mc (3D 제조시스템)
  • 공학설계D/B

    공학설계D/B 게시판 내용
    Volume Title Wind Engineering
    Volume No Mean loads on structures - single circular and multi-sided cylinders, cylinder groups.
    DATA Title Mean fluid forces and moments on cylindrical structures: polygonal sections with rounded corners including elliptical shapes.
    DATA Item 79026
    KEYWORD bluff, body, building, centre, crosswind, cylinder, drag, elliptical, flow, fluid, force, moment, overturning, polygonal, pressure, prism, section, shear, sideforce, square, structure, wedge, wind, center
    ISBN 0 85679 274 8
    ABSTRACT ESDU 79026 gives curves obtained by correlating experimental data drawn from a wide range of sources in the literature. The graphs give the drag in uniform two-dimensional flow of regular polygonal sections with from four (square-section) to 20 sides, single- and double-wedge sections, elliptical sections and a 12 sided elliptical section. The effect of corner rounding between the extremes of sharp-edged to the inscribed circle is considered. Factors are included to correct the data for turbulence (and a table gives values of the appropriate turbulence parameters in a wide range of conditions both atmospheric or in internal flow), the effect of aspect ratio, and the effect of shear flow and taper. A method of calculating the centre of pressure and hence the overturning moment is also given. For the elliptical section, data are included for the situation when the section is not aligned with the flow. A comprehensive worked example illustrates the application of the data to a multi-sided pylon supporting a power cable.

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