开口状态及干扰对柱面结构风荷载的影响

为满足储煤量、工艺及环保的要求,柱面煤棚结构常常成对出现且在端部和两侧采用不同形式的开口,煤棚间的相互干扰和开口状态对风荷载的影响效应目前尚不明确。针对此问题,通过刚性模型测压试验,研究了端部、两侧开口状态以及煤棚间距对其结构表面风荷载的影响,通过对比结构整体力系数、体型系数分布及脉动风压系数,给出了风向角、开口状态及间距对风荷载的影响规律,分析了其产生机理,并给出了该类结构的风荷载建议。结果表明:半封闭的端部开口方式能有效减小结构整体风荷载,且脉动风压值最小;两侧30%开孔率的开口形式,结构表面的风荷载分布更均匀,减小结构的脉动风压;煤棚之间的干扰对平均风荷载主要为遮挡效应,对脉动风荷载影响不显著。

Effects of Openings and Interferences on Wind Load on Cylindrical Structure

Due to the requirements of storage capacity, craft and environmental protection, the cylindrical structure coal sheds are often paired and have various openings at both ends and sides. The effects of the interference between the-coal sheds and the openings on wind loads are still unclear. The rigid pressure-testing is carried out in wind tunnel. The effects of the openings at both ends and sides and the distances between two sheds on the wind loads are studied. By comparing integral force coefficients, pressure coefficients and fluctuating wind pressure coefficient distribution, the wind load and its mechanism at various wind direction, openings and the distances are also discussed. The results show that semi-closed ends can effectively reduce the overall wind loads on the structure and the value of fluctuating wind pressure coefficient is decreased. The wind distribute smoothly and the fluctuating wind pressure is reduced on both sides of the opening rate of 30%. The interference between the coal shed on the average wind load is the main shielding effect, influence on the fluctuating wind load is not significant. Finally, the wind loads suggestions are given for structure design.