不同端部封闭条件下双跨柱面煤棚风致内压特性

Wind-induced internal pressure characteristics of double-span cylindrical coal shed in different closed forms at the ends

采用刚性模型风洞试验方法,分析了两端开敞、两端半封闭和一端开敞、一端半封闭状态下煤棚的主体结构和围护结构的风致内压特性.结果表明:对于主体结构,相比两端开敞状态煤棚,在0°风向角下,一端半封闭、一端开敞状态下的煤棚在开敞端的风压系数增强;在90°风向角下,迎风开敞、背风有墙状态下,内压表现为正,反之则表现为负;迎风端有墙降低低频对风压脉动量的贡献,背风端有墙增强附近测点的功率谱的低频能量.对于围护结构,相比两端开敞状态,一端半封闭、一端开敞状态下煤棚的有墙端正压减小,整体内表面承受的极值风压更大,对结构更为不利.

In this paper, a rigid model wind tunnel test method is used to analyze wind-induced internal pressure characteristics of the main and cladding structure in the state of being open at both ends, being semi-closed at both ends and being open at one end, being semi-closed at the other end. Results show that for the main structure, when the wind direction is 0°, compared with the cylindrical coal shed in the open state at both ends, the wind pressure coefficient in the state of being open at one end and being semi-closed at the other is enhanced. When the wind direction is 90°, compared with the structure of being open at both ends, the internal pressure is positive when the wind end is open and the leeward is wall. Otherwise, it is negative. The wall in the wind end reduces the wind pressure correlation characteristics of adjacent measuring points and the contribution of low frequency to the wind pressure fluctuation quantity. The wall at the leeward end enhances the wind pressure correlation and the low-frequency energy of the power spectrum of fluctuating wind pressure of adjacent measuring points. For the cladding structure, the maximum value of the coal shed in the semi-closed state at both ends is reduced compared with the open state at both ends. The positive pressure of the walled end of the coal shed with one semi-closed end and one open end is reduced. The extreme pressure on the overall inner surface is greater, which is unfavorable to the structure.