两种类型干煤棚的表面风压与整体风荷载对比

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (8) : 226-233.

论文

沈国辉，韩康辉，李懿鹏，姜咏涵

作者信息 +

Comparison of surface wind pressures and overall wind loads on two types of dry coal sheds

SHEN Guohui,HAN Kanghui,LI Yipeng,JIANG Yonghan

Author information +

文章历史 +

摘要

通过测压风洞试验对比三心圆型和子弹头型干煤棚的风压分布和整体风荷载，分析两类干煤棚体型系数随风向角的分布，将干煤棚的体型系数与规范值进行对比，比较两类干煤棚随风向角的整体风荷载，给出子弹头型干煤棚中间与两侧的整体力系数。研究表明三心圆型干煤棚在墙面正迎风情况下屋面迎风侧负压较大，中间及背风侧负压较小；两类干煤棚的极值负压均出现在斜风向的顶部附近；侧面正迎风情况下GB规范的正压小于试验值，AIJ规范和EN规范的负压大于试验值，体型系数随角度变化剧烈，规范中分段体型系数表达并不合理，提出基于三角函数的体型系数拟合公式；三心圆型干煤棚升力系数小于同样矢跨比的子弹头型，从设计控制角度三心圆型干煤棚的整体平均风荷载小于子弹头型。

Abstract

Wind tunnel test was employed to compare the wind pressure distribution and overall wind load of three-centered and bullet-type dry coal sheds. The distribution of shape coefficients of the two types of dry coal sheds under different wind direction was analyzed. Then the testing results were compared with those regulated in various specifications. The overall force coefficients on the two types of dry coal sheds under various wind azimuths were calculated and compared. The overall force coefficients of the middle part and both sides of the bullet-type dry coal shed were given. Studies show that the negative pressure on the windward side of the roof is relatively large when the wind direction is facing the wall, while the negative pressure on the middle and leeward sides is relatively small. The peak negative wind pressures of the two types of dry coal sheds appear near the top of sheds under inclined wind azimuth. When the wind direction is facing the side of the shed, the positive pressure regulated in the GB specification is less than the test values, and the negative pressure regulated in the AIJ and EN specification are greater than the test values. The shape coefficient changes sharply with the angle, therefore the expressions of segmented shape coefficient in the specifications are not reasonable. The fitting equation base on trigonometric function was thereby developed. The lift coefficients of the three-centered dry coal shed are smaller than those of the bullet-type shed with the same rise-span ratio, indicating that the overall averaged wind load of the three-centered shed is smaller than that of the bullet-type shed in the view of design.

导出引用

沈国辉，韩康辉，李懿鹏，姜咏涵. 两种类型干煤棚的表面风压与整体风荷载对比[J]. 振动与冲击, 2023, 42(8): 226-233

SHEN Guohui,HAN Kanghui,LI Yipeng,JIANG Yonghan. Comparison of surface wind pressures and overall wind loads on two types of dry coal sheds[J]. Journal of Vibration and Shock, 2023, 42(8): 226-233

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