局部构造对月牙形凸屋盖风荷载影响的研究  

Effect of local configurations on wind load of a crescent-shaped convex roof structure

作　　者：李超[1] 陈水福[1] 盛建康[1] 

机构地区：[1]浙江大学土木工程学系,浙江杭州310058

出　　处：《空间结构》2010年第3期47-54,共8页Spatial Structures

基　　金："十一五"国家科技支撑计划(2006BAJ03A02);国家自然科学基金资助项目(50978230)

摘　　要：对一月牙形曲壳凸屋盖结构在改变局部构造(边缘增设下翻沿、角部开格栅形孔洞)前、后的风压分布进行了CFD(计算流体动力学)数值模拟分析,对构造改变后的屋盖进行了表面风压的风洞模型试验.结果显示,下翻沿使背风屋盖下表面的风压趋于均匀,风压数值降低,但下翻沿会使屋盖迎风前角小范围内的风压数值趋于增大;角部开孔对包括开孔部位在内的屋面风压分布影响不大,但减小了屋盖角部的有效受风面积.将数值模拟结果与风洞试验结果比较后发现,屋盖上表面的风压计算值与风洞试验值吻合良好,但下表面的风压分布有一定的差异.In this paper,the CFD（computational fluid dynamics） simulation for wind pressure distributions was conducted to a crescent-shaped convex roof structure before and after changing its local configurations（adding downward flange at the edge and grid-shaped holes in the corners）.A wind tunnel model test was carried out to determine the wind pressures on the final configured roof.The numerical results show that the downward flange makes the distribution of wind pressures on the lower surface more uniform and the magnitude smaller.But meanwhile the pressures in the front corner of the roof become larger.The grid-shaped holes in the corners have little effect on the wind pressures on the whole surface of the roof including small regions surrounding the holes.However,the total area suffering from the wind load has decreased.Comparison of the CFD simulation results with those of the win-tunnel test indicates that the former agrees well with the latter on the upper surface of the roof,but some differences exist on the lower surface.

关 键 词：大跨屋盖 风压 局部构造 下翻沿 数值模拟 风洞试验 

分 类 号：TU393.3[建筑科学—结构工程] TU312.1