间隔性天窗启闭对网壳结构风荷载影响规律的试验研究

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (6) : 176-183.

土木工程

间隔性天窗启闭对网壳结构风荷载影响规律的试验研究

李宇青1，王昕1，刘小兵*1,2,3，陈安杰1，崔会敏2,3,4

作者信息 +

Experimental study on the influence of opening and closing of spacer skylights on the wind load on reticulated shell structures

LI Yuqing1,WANG Xin1,LIU Xiaobing*1,2,3,CHEN Anjie1,CUI Huimin2,3,4

Author information +

文章历史 +

摘要

大跨柱面网壳结构由于质量轻、柔度大，对风荷载比较敏感，在顶部开启间隔性天窗对结构的抗风性能具有较大的影响。以某大跨度柱面网壳结构为研究对象，通过刚性模型测压风洞试验方法，分析了在不同风向角下顶部间隔性天窗启闭对结构的体型系数、整体力系数以及极值风压系数的影响规律。结果表明：天窗的启闭对结构外表面风荷载影响整体较小，对内表面风荷载的影响比较明显。内表面风荷载的变化是导致结构风荷载随天窗启闭变化的主要原因。在跨向来流下，与天窗关闭时相比，天窗开启时，结构的跨向整体力更大，增大幅度约为34%，这种“增大效应”随着来流偏离跨向逐渐减弱，当偏离跨向60°时基本消失；结构的竖向整体力更小，减小幅度约为47%，这种“减小效应”随着来流偏离跨向逐渐减弱，但即使偏离90°（纵向来流）时仍存在。与天窗关闭时相比，天窗开启时结构的正向极值风压力增大，大部分区域的负向极值风吸力减小，但天窗局部区域的负向极值风吸力有所增大。

Abstract

The large-span cylindrical reticulated shell structure is sensitive to wind load. The opening of spacer skylights at the top has a great influence on the wind resistance of the structure. In this paper, the large-span cylindrical reticulated shell structure is studied by the rigid model pressure measurement wind tunnel test method, and the influence of the opening and closing of the top spaced skylight on the shape coefficient, the overall force coefficient and the extreme wind pressure coefficient of the structure under different wind direction angles is analyzed. The results show that the opening and closing of the skylight has little influence on the wind load of the outer surface of the structure, but the influence of the wind load of the inner surface is obvious. The change of the wind load on the inner surface is the main reason for the variation of the wind load of the structure with the opening and closing of the skylight. Compared with the skylight is closed, the overall force of the structure increases by about 34% when the skylight is opened. This effect gradually weakens with the deviation of the incoming flow, and when the deviation is 60°, the effect is basically gone. The vertical overall force of the structure is smaller, with an amplitude reduction of about 47%, and this effect gradually weakens with the deviation of the flow from the span direction, but still exists even when the deviation is 90° (longitudinal flow). Compared with the skylight is closed, the positive extreme wind pressure of the structure increases when the skylight is opened, and the negative extreme wind suction decreases in most areas, but the negative extreme wind suction increases in some areas of the skylight.

导出引用

李宇青1, 王昕1, 刘小兵1, 2, 3, 陈安杰1, 崔会敏2, 3, 4. 间隔性天窗启闭对网壳结构风荷载影响规律的试验研究[J]. 振动与冲击, 2025, 44(6): 176-183

LI Yuqing1, WANG Xin1, LIU Xiaobing1, 2, 3, CHEN Anjie1, CUI Huimin2, 3, 4. Experimental study on the influence of opening and closing of spacer skylights on the wind load on reticulated shell structures[J]. Journal of Vibration and Shock, 2025, 44(6): 176-183

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