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,当天窗开启时,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。
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.A large-span cylindrical reticulated shell structure was studied by the rigid model pressure measurement wind tunnel test method,and the influence of the opening and closing of the top spacer skylight on the shape coefficient,the overall force coefficient and the extreme wind pressure coefficient of the structure under different wind direction angles were analyzed.The results show that the opening and closing of the skylight has little influence on the wind load on the outer surface of the structure,but the influence on the wind load on 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 on the structure by the opening and closing of the skylight.Compared with the case of closed skylight,the overall force on 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 vanished.The vertical overall force on 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 case of closed skylight,the positive extreme wind pressure on the structure increases when the skylight is opened,and the negative extreme wind suction decreases in most areas,but the negative extreme wind suction still increases in some local areas of the skylight.
作者
李宇青
王昕
刘小兵
陈安杰
崔会敏
LI Yuqing;WANG Xin;LIU Xiaobing;CHEN Anjie;CUI Huimin(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Department of Mathematics and Physics,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)
出处
《振动与冲击》
北大核心
2025年第6期176-183,共8页
Journal of Vibration and Shock
基金
国家自然科学基金项目(52078313,52008273)
河北省自然科学基金创新研究群体项目(E2022210078)
中央引导地方科技发展资金项目(236Z5407G
236Z5410G)。
关键词
大跨柱面网壳结构
间隔性天窗
风洞试验
整体力系数
极值风压系数
large-span cylindrical reticulated shell structure
spacer skylight
wind tunnel test
overall force coefficient
extreme wind pressure coefficient
