半球形储煤场屋盖风压分布风洞试验研究  

Wind tunnel test on wind pressure distribution on the roof ofhemispherical coal storage yard

作　　者：温博 聂少锋[2] 刘哲 WEN Bo;NIE Shaofeng;LIU Zhe(Xi’an Branch of CCTEG Beijing Huayu Engineering Co.,Ltd.,Xi’an 710075,China;School of Civil Engineering,Chang’an University,Xi’an 710061,China)

机构地区：[1]中煤科工集团北京华宇工程有限公司西安分公司,陕西西安710075 [2]长安大学建筑工程学院,陕西西安710061

出　　处：《煤炭工程》2024年第10期268-274,共7页Coal Engineering

摘　　要：半球形储煤场结构跨度大且覆盖面积广,对风荷载的作用十分敏感,在结构设计中风荷载往往起到控制作用。通过风洞试验研究了半球形储煤场屋盖的风压分布情况,得到了结构在24个风向角下的平均风压系数等值线、脉动风压系数等值线及相应的屋盖分区体型系数。结果表明:在风荷载作用下,半球形储煤场结构屋盖迎风面的平均风压系数分布垂直于来流方向呈等压条带状;迎风面下部的扇形区域主要受风压力,最大值出现在半球形屋盖迎风面最下部边缘;半球形屋盖中上部、两侧及背风区域主要受风吸力作用,最大值出现在受通风口开口影响的檐口区域附近;当转运塔处在屋盖顺风向两侧区域时,转运塔附近的屋盖区域负压力会出现较大值,平均风压系数为-1.40;屋盖顶部通风口区域由于高度最高,各风向角下吸力均为最大,60°风向角下局部分区体型系数达到-2.15,更容易受到破坏。针对试验结果,对半球形储煤场屋盖提出了设计建议。The hemispherical coal storage yard structure is highly sensitive to wind loads due to its large span and extensive coverage,making wind loads a controlling factor in the structural design.The distribution of wind pressure on the roof of a hemispherical coal storage yard was studied through wind tunnel tests.The average wind pressure coefficient contour,fluctuating wind pressure coefficient contour,and corresponding roof partition shape coefficients of the structure were obtained at 24 wind directions.The results show that under the action of wind load,the average wind pressure coefficient distribution on the windward surface of the hemispherical coal storage yard structure roof is perpendicular to the incoming flow direction and forms an equal pressure strip;The fan-shaped area below the windward surface is mainly subjected to wind pressure,with the maximum value occurring at the bottom edge of the windward surface of a hemispherical roof;The upper part,both sides,and leeward area of a hemispherical roof are mainly affected by wind suction,with the maximum value occurring near the eaves area affected by ventilation openings;When the transfer tower is located on both sides of the roof in the downwind direction,the negative pressure in the roof area near the transfer tower will show a large value,with an average wind pressure coefficient of-1.40;Due to its highest height,the ventilation area at the top of the roof has the highest suction force at all wind angles.In some areas,the body shape coefficient reaches-2.15 at a 60°wind angle,making it more susceptible to damage.Based on the test results,design suggestions for the roof of hemispherical coal storage yard are proposed.

关 键 词：半球形大跨结构 风洞实验 平均风压系数 脉动风压系数 体型系数 

分 类 号：TD56[矿业工程—矿山机电] TU272.1[建筑科学—建筑设计及理论]