小长跨比柱面煤棚风荷载特性试验研究

Experimental Study on Wind Load Characteristics of Cylindrical Coal Shed with Small Length-Span Ratio

以某实际工程柱面煤棚(长跨比为5/6)为对象,通过刚性模型测压风洞试验的方法研究了小长跨比柱面煤棚的风荷载特性。分析了风荷载体型系数和整体力系数随风向角的分布规律,讨论了表面脉动风压的非高斯特性,在此基础上明确了极值风压系数的分布规律。结果表明,当来流风与跨向呈45°角时,煤棚跨向受力最大;当来流风垂直跨向时,煤棚受到的竖向吸力最大;煤棚在角部区域的极值风压最大,进行围护结构设计时应注意提高角部区域的抗风性能。

Taking a practical cylindrical coal shed(length-span ratio of 5/6)as the object,the wind load characteristics of cylindrical coal shed with a small length-span ratio were studied by pressure-measured rigid model wind tunnel tests.The distribution law of wind load shape coefficient and overall force coefficient with wind direction angle was analyzed,and the non-Gaussian characteristics of surface fluctuating wind pressure were discussed.On this basis,the distribution law of the extreme wind pressure coefficient was clarified.The results show that when the incoming wind is at a 45°angle with the span direction,the span direction stress of the coal shed is the largest.When the incoming wind crosses vertically,the vertical suction on the coal shed is the largest.The extreme wind pressure of the coal shed in the corner area is the largest.Attention should be paid to improving the wind resistance of the corner area when designing the enclosure structure.