大跨球壳结构风压分布规律和风致干扰效应试验研究

Experimental study on wind pressure distribution and wind-induced interference effects on long-span spherical structure

球壳结构对风荷载比较敏感,风荷载为其主要控制荷载之一。通过风洞试验,在不同工况下对球壳结构表面进行了同步测压,研究了结构在不同工况下的风荷载分布特性和风致干扰效应。研究结果表明:天窗开启和关闭对结构外表面部分区域风压分布有明显影响,主要影响结构的背风面风压。对于结构内表面,风荷载在天窗关闭时变小,对内部结构有利。针对用于储煤的大跨球壳结构,有无煤堆对结构外表面顺向风压分布没有明显的影响,但对横风向风压分布有一定的影响。两个相邻建筑物间的相对位置对结构的风致干扰效应有一定程度的影响,周边建筑物的干扰对受扰结构不同区域的影响并不相同。

Spherical shell structure is very sensitive to wind loads. The wind load is one of the most important loads in structural design. By wind tunnel tests, simultaneous multi-pressure measurement on surface of spherical shell structure was carried out under different conditions to study the characteristics of wind load distribution and windinduced interference effects. Results show that opened and closed sunroofs have significant effect on wind pressure distribution on the outer surface of the structure in partial region,especially,leeward side. For the inner surface of the structure,wind pressure become small when sunroof is closed,which is safe for the outer structure. Coal dump has no effect on wind pressure distribution along wind direction,while in cross wind direction it has effect. Different relative positions of adjacent structures have certain influence on wind-induced interference effects and different regions have different effects.