摘要
为研究不同百叶窗透风率下超大型冷却塔内吸力风振系数的分布特性和取值,以国内某在建210m高超大型冷却塔为工程背景,首先通过同步刚体测压风洞试验,得到了不同透风率（0%、15%、30%及100%）下冷却塔结构内表面平均与脉动风荷载。在此基础上,对比分析不同透风率平均和脉动风压分布特性,并采用有限元方法建立了塔筒-支柱-环基一体化仿真分析模型,对该超大型冷却塔进行四种内吸力作用工况下完全瞬态时域动力计算。对比了四种透风率下内吸力风振系数的一维、二维和三维分布特征,分析了以塔筒径向位移、子午向轴力、von Mises应力和环向弯矩四种典型目标响应下的风振系数取值标准,分别给出了此类超大型冷却塔不同透风率下内吸力风振系数的取值建议,即0%、15%、30%及100%透风率下内吸力风振系数分别取为1.69、1.79、1.69和1.57。
To study the distribution characteristics and the value of internal wind vibration coefficient of super large cooling tower under different louver ventilation rates, an under-construction domestic 210 m super large cooling tower was selected as the project background. Firstly, a rigid wind pressure model was built and a wind tunnel test is conducted, from which the mean and fluctuating wind loads on the internal surface of the tower under different ventilation rates （0% , 15% , 30% and 100% ） were obtained. Based on this, the distribution characteristics of the mean and fluctuating wind pressures under different ventilation rates were compared and analyzed. The finite element method was used to establish a comprehensive model consisting of tower cylinder, strut, and ring foundation, and a transient dynamic analysis on the super large cooling tower was carried out under four kinds of internal suction. The one-dimensional, two-dimensional and three-dimensional distribution characteristics of wind vibration coefficient under the four ventilation rates were compared. A standardized approach for obtaining the wind vibration coefficients catering to four typical target responses, i. e., radial displacement, meridional axial force, von Mises stress and circumferential bending moment, was discussed. Recommended values of wind vibration coefficients under the different ventilation rates are given respectively as 1.69（0% ）, 1.79（15% ）, 1.69（30% ）, 1.57（100% ）.
作者
柯世堂
杜凌云
侯宪安
KE Shitang;DU Lingyun;HOU Xian＇ an(Department of Civil Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Department of Civil Engineering Technology,Northwest Electric Power Design Institute of China Power Engineering Consulting Group,Xi＇ an 710075,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2018年第8期36-44,共9页
Journal of Building Structures
基金
江苏省优秀青年基金项目(BK20160083)
国家自然科学基金项目(51208254)
中国博士后科学基金项目(2013M530255,1202006B)
关键词
超大型冷却塔
风洞试验
透风率
内吸力
风振系数
super large cooling tower
wind tunnel test
ventilation rate
internal suction
wind vibration coefficient
