内外压分别作用下冷却塔风振系数对比研究  

Comparative Research on Wind Vibration Coefficient for Cooling Towers Under the Internal and External Wind Pressure

作　　者：杜凌云[1,2] 柯世堂 侯宪安[3] DULingyun;KE Shitang;HOU Xianan(Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics Nanjing,210016,China;Envision Energy (Jiangsu) Co.,Ltd Shanghai,200050, China;Department of Civil Engineering Technology, Northwest Electric Power Design Institute of China Power Engineering Consulting Group Xi'an,710075 , China)

机构地区：[1]南京航空航天大学土木工程系,南京210016 [2]远景能源(江苏)有限公司,上海200050 [3]中国电力工程顾问集团西北电力设计院土木工程技术部,西安710075

出　　处：《振动．测试与诊断》2019年第3期463-470,665-666,共10页Journal of Vibration,Measurement & Diagnosis

基　　金：江苏省优秀青年基金资助项目(BK2016003);国家自然科学基金资助项目(U1733129,51208254,51878351);博士后科学基金资助项目(2013M530255,1202006B);江苏高校青蓝工程联合资助项目

摘　　要：现有冷却塔规范和文献中关于风振系数的研究和取值建议均针对外表面风荷载作用,并认为内压作用下风振系数与外压作用下的数值一致,这无法真实反映冷却塔内压引起的风振效应。为对比研究内、外压分别作用下超大型冷却塔结构的风振特性及风振系数,以国内某在建超规范限值高210m间接空冷塔为研究对象,首先,进行刚体同步测压风洞试验获取内、外表面平均和脉动风荷载;其次,建立塔筒-支柱-环基一体化有限元模型,采用完全瞬态法对超大型冷却塔在内、外压分别作用下的塔筒风振响应和风振系数进行了精细化计算分析,探讨了以塔筒径向位移、子午向轴力、Von Mises应力和环向弯矩4种典型目标响应下的风振系数取值标准,提炼出超大型冷却塔内、外压作用下的一维、二维和三维风振系数分布规律;最后,分别给出了此类超大型冷却塔内、外压作用下风振系数的取值建议和二维拟合公式。主要结论可为此类超大型冷却塔风振系数的精细化取值提供科学依据。The study and the value suggestion of wind vibration coefficient are aimed at external wind load in existing specification and literature,which considers the internal wind vibration coefficient is consistent with the external wind vibration coefficient.This method cannot truly reflect the wind vibration effect caused by the internal wind pressure.To contrastively study the wind vibration characteristics and wind vibration coefficient of a super large cooling tower under the internal and external wind load,an under-construction domestic 210 mlarge cooling tower is set as the research object.Rigid wind tunnel test is conducted to obtain the average and fluctuating wind load inside and outside surface.On this basis,the integrated finite element model of tower cylinder-strut-ring foundation is established.The transient dynamic analysis is used to calculate and analyze the wind vibration response and the coefficient of the super large cooling tower under the internal and external wind load.The standards of wind vibration coefficients under the four typical target responses,the radial displacement,the meridional axial force,the Von Mises stress and the circumferential bending moment,are discussed.The distribution laws of one-dimensional,two-dimensional and three-dimensional internal and external wind-induced vibration coefficients of the super large cooling tower are extracted.In the end,the value suggestion and the two-dimensional fitting formula of wind vibration coefficients are given.The main conclusions can provide a scientific basis for the accurate value of the wind vibration coefficient of this kind of super large cooling towers.

关 键 词：超大型冷却塔 风洞试验 内外压分别作用 风振系数 拟合公式 

分 类 号：TU279.7[建筑科学—建筑设计及理论]