并列双煤棚风荷载干扰效应试验研究

Experimental Study on Interference Effect of Wind Load on Parallel Double Coal Shed

大跨煤棚结构对风荷载较为敏感。针对封闭双煤棚进行了刚性模型测压风洞试验,研究了并列双煤棚在3种不同间距比L(L=0.125、0.250、0.500)情况下,结构表面测点的风荷载体型系数分布规律,给出了双煤棚最适宜布置方式及最不利风向角。研究发现,煤棚并列放置时随着间距比的增大,目标煤棚受到干扰煤棚的影响逐渐减小;风向平行于长轴为最不利风向角,此时狭管效应占主导地位;风向垂直于长轴为最有利风向角,遮挡效应起主导作用;煤棚并列放置且间距比L=0.125时,目标煤棚的体型系数均在规范要求范围内,考虑到节约场地,煤棚可保持间距比L=0.125放置。

Long-span coal shed structures are sensitive to wind loads.A rigid model pressure measurement wind tunnel test was carried out for a closed double coal shed in this research.The distribution law of wind load shape coefficient at the structural surface measuring points was studied under three different spacing ratios L(L=0.125、0.250、0.500).The most suitable arrangement and the most unfavorable wind direction angle of the double coal shed were proposed.It is found that when the coal shed is placed in parallel,the influence of interference on the target coal shed decreases with the increase of spacing ratio.The wind direction parallel to the long axis is the most unfavorable wind direction angle,and the narrow tube effect dominates at this time.The wind direction perpendicular to the long axis is the most favorable wind direction angle,and the occlusion effect plays a leading role.When the coal shed is placed in parallel and the spacing ratio L=0.125,the shape coefficient of the target coal shed is within the scope of the specification requirements.Considering the factor of saving space,the coal shed can maintain the spacing ratio L=0.125.