A CONVERGENCE AREA EFFECT OF WIND SPEED TO WIND RESISTANCE PERFORMANCE EVALUATION OF STRUCTURES

制备具有300个90 mm * 37 mm的开口的层网格。使用分层网格生成均匀分布的风场和直线梯度剖面。分析了风场3个分量的湍流特性。使用九州大学工学部建筑学系的风洞试验装置。测量断面面积为1.5m*1.5m。测量位置为格栅下游1, 500 mm处。获得了以下结果。(1)层栅所有开口均打开时的平均风分布：（a）纵向分量（平均风向分量）均匀分布。试验风速为15 m/s。(b)垂直和水平方向的横向分量平均风速均为0 m/s左右的均匀分布。(2)层栅开孔条件下的紊流特性：（a）层栅开孔处紊流强度比 ...更多信息 最终，垂直横向和水平横向分量变为1.0：0.09：0.78。(b)纵向、垂直横向和水平横向分量的湍流尺度之比为2：1：1。(c)除测量截面内的壁面邻域外，三个分量的功率谱与各向同性湍流理论中的Karman谱基本一致。(3)通过调整开口宽度的直线廓线条件下的平均风分布：（a）纵向分量（平均风向分量）的风廓线在测量截面内中心的1/3范围内呈直线分布。(b)垂直和水平横向分量的平均风速均为近零m/s的均匀分布。(4)直线剖面条件下的湍流特性：（a）3个分量的湍流强度均呈直线斜率。(b)三个分量的湍流尺度均大于均匀分布时的湍流尺度。(c)在平均风速的直线斜率范围的一半左右范围内，3个分量的湍流尺度与风速值成比例地变大。纵向分量最明显。（d）三个分量的湍流谱与纵向分量的湍流谱相似。少

A layr grid having 300 openings of 90mm*37mm was prepared. Using the layr grid wind fields of a uniform distribution and a straight gradient profiles were genrated. The turbulence characteristics of the 3 components of the wind fields were examined. A wind tunnel test device in Department of Architecture, Faculty of Engineering, Kyushu University was used. The measurement section area is 1.5m*1.5m. The measurement position is the lower stream 1,500mm of the grid. The following results were obtained.(1) Mean wind distribution in the condition where all openings of the layr grid are open :(a) A longitudinal component (a component in mean wind direction) is uniform distribution. The wind speed in testing is 15m/s.(b) The mean wind speeds of lateral components in vertical and horizontal directions are uniform distribution of an about 0m/s.(2) Turbulence characteristics in the condition where all openings of the layr grid are open :(a) A ratio of the intensity of turbulence of the longitudi … More nal, vertical lateral and horizontal lateral components became 1.0 : 0.09 : 0.78.(b) A ratio of the scale of turbulence of the longitudinal, vertical lateral and horizontal lateral components became 2 : 1 : 1.(c) Power spectra of the three components agree with Karman's spectrum in the theory of isotropic turbulence for the most part except the wall neighborhood inside the measurement section.(3) Mean wind distribution in condition of a straight line profile by adjusting the width of the openings :(a) The wind profile of he longitudinal component (component in mean wind direction) shows a straight line distribution in 1/3 range area of the center inside the measurement section.(b) The mean wind speeds of vertical and horizontal lateral components are uniform distribution of nearly zero m/s.(4) Turbulence characteristics in condition of a straight line profile :(a) The intensities of turbulence of 3 components show a straight line slope.(b) Scales of turbulence are larger than those in uniform distribution in all of 3 components.(c) In the about half range of a straight line slope range of average wind velocity, scales of turbulence of 3 components becomes big in proportion to a wind velocity value. The longitudinal component is most obvious.(d)The turbulence spectra in all of 3 components are similar with those of the longitudinal component. Less