窑尾预热器塔架风荷载体型系数的数值模拟研究  

Numerical simulation of wind load type coefficient of tower of preheater

作　　者：吴家桐 董天舒 胡波[1] DONG Tianshu

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]合肥水泥研究设计院有限公司,安徽合肥230051

出　　处：《水泥》2024年第12期37-43,共7页Cement

摘　　要：水泥工厂窑尾塔架作为一种风敏感的超高层钢结构建筑,其风荷载体型系数的确定在设计中至关重要。目前的GB 50009—2012《建筑结构荷载规范》[1]仅针对封闭塔架结构提供了风荷载体型系数取值,对于实际敞开塔架结构未考虑到层间设备的影响,导致在结构设计中采用偏保守的系数,增加了钢材用量和结构自重,造成材料浪费。为此,本文通过FLUENT软件进行了窑尾塔架在不同风向角下的数值模拟,并通过已有高层建筑风洞试验验证了数值模拟的准确性,进而将数值模拟结果与传统规范设计和PKPM计算结果进行对比分析。结果表明,数值模拟可以真实地模拟风场,准确分析窑尾塔架结构在真实情况下的风压特性。规范设计中的风荷载体型系数取值较为保守,在实际设计中可降低其取值。窑尾塔架的体型系数受到层间设备分布和高度的显著影响,根据设备平均宽度的变化可将整个窑尾塔架分为三个区域,在各分区内体型系数变化与高度之间基本呈线性关系。最后基于数据拟合,提出了窑尾塔架风荷载体型系数新的取值建议。As a wind-sensitive super-high-rise steel structure,the determination of the wind load factor for the kiln-tail tower of a cement plant is of critical importance in the design.The current “GB 50009—2012” only provides wind load coefficient values for closed tower structures,and the actual open tower structure does not take into account the influence of interstory equipment,which leads to the use of conservative coefficients in structural design,increasing the amount of steel and structural weight,resulting in a waste of materials.For this reason,this paper carried out numerical simulation of kiln-tail tower under diffierent wind angles through FLUENT software,and verified the accuracy of numerical simulation through the wind tunnel test of existing high-rise buildings,and then compared and analyzed the results of numerical simulation with the traditional specification design and PKPM calculation results.The results show that the numerical simulation can realistically simulate the wind field and accurately analyze the wind pressure characteristics of the kiln-tail pylon structure under real conditions.The wind load coefficients in the code design are conservative and can be reduced in the actual design.The body shape coefficient of the kiln tail tower is significantly affiected by the distribution of the equipment between the layers and the height.According to the variation of the average width of the equipment,the whole kiln tail tower can be divided into three zones,and the variation of the body shape coefficient and the height are basically in a linear relationship in each sub-zone.Finally,based on the data fitting,a new value for the wind load coefficient of the kiln tail tower is proposed.

关 键 词：窑尾塔架 风荷载 风洞模拟 体型系数 数值分析 

分 类 号：TQ172.6[化学工程—水泥工业]