模型表面粗糙度对冷却塔风荷载的影响  

THE INFLUENCE OF MODAL SURFACE ROUGHNESS ON WIND LOADS OF COOLING TOWERS

作　　者：沈国辉[1] 余关鹏 孙炳楠[1] 楼文娟[1] 李庆祥[3] 杨仕超[3] 

机构地区：[1]浙江大学土木工程学系,杭州310058 [2]中国联合工程公司,杭州310022 [3]广东省建筑科学研究院,广州510500

出　　处：《工程力学》2011年第3期86-93,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(50608063);浙江省土木工程灾变控制重点创新团队资助(2009R50050)

摘　　要：采用两种粗糙条数量和五种粗糙条厚度分析模型表面粗糙度对冷却塔风荷载的影响,应用本征正交分解法(POD)进行风压点的加密和重构,分析不同粗糙度下冷却塔的风压分布和总体受力,并将试验结果与规范、以往的实测和风洞试验结果进行比较。研究发现:冷却塔模型的表面越光滑,喉部附近B层测点最大负风压的绝对值越大;当模型表面粗糙条数量增大时,冷却塔的底部剪力系数变大,受到的总体风阻力越大;冷却塔颈部附近的阻力系数与规范数据接近,而顶部和中下部的阻力系数比规范大,需引起设计的重视。Two types of roughness element numbers and five thicknesses of element heights were used to investigate the influence of modal surface roughness on wind loads of cooling towers.The technique of proper orthogonal decomposition method（POD） was employed to interpolate and reconstruct the wind pressures on the towers.The distribution of wind pressures and overall wind forces on the cooling tower were analyzed with respect to surface roughness.Then the experimental results were compared with the data of the Code,previous full-time tests,and previous wind tunnel tests.The results from this study show that if the surface of the tower model is smoother,the absolute value of the wind pressure on layer B（near the throat） is larger.When the number of surface roughness elements increases,the base shear coefficients of the cooling tower become larger,resulting in larger overall wind-resistant forces.The drag coefficients near the throat of the cooling tower are close to the data of the Code,whereas the drag coefficients of the top and the mid-bottom of the tower are larger than the data of the Code,in which additional attention should be paid by the designers.

关 键 词：冷却塔 风荷载 风洞试验 表面粗糙度 本征正交分解法 

分 类 号：TU312.1[建筑科学—结构工程]