秦  云  张耀春  王春刚　（哈尔滨工业大学土木工程学院  150090）

[提要]  借助计算流体动力学( CFD)大型商业软件Fluent6.0，对大气边界层内由两平行面板组成的独柱支承广告牌的表面风压进行了研究，发现结构的雷诺数敏感性、地貌类别对结构风压和风致扭矩系数的影响可以忽略不计。在此基础上，采用实体和面板两种组合模式，以C类地貌边界层剪切流为来流条件，深入研究了这种广告牌在各种来流方向角下的表面风压分布，指出了两种模式下风荷载的差别，得到了结构的总体平均和局部风压系数，给出了风致剪力和扭矩的计算表达式。建议可供同类结构抗风设计时参考。
[关键词]  计算流体动力学( CFD)  风压数值模拟  广告牌设计  风致扭矩

With the aid of Computational Fluid Dynamics( CFD) commercial large-scale software Fluent6.0,  the surface pressures of billboards consisting of two parallel panels supported by single column in　atmospheric boundary are analyzed. The results indicate that the sensation of Reynolds number( Re),  the effects of terrain type on coefficients of wind pressure and the structure torque induced by wind can be neglected. Based on the solid and built-in panels modes, taking the shear flow in terrain C as the approaching flow, the distributions of wind pressure in various approaching directions are investigated thoroughly. The difference of wind load between the two modes' is identified. The total mean and local wind pressure coefficients are obtained, and formulas of shear force and torque induced by wind are proposed. The suggestions can be used as the references in similar structural design.
Keywords: computational fluid dynamics; wind pressure numerical simulation; billboard design;  torque

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