超大型冷却塔阻尼比现场实测及风振效应影响  

Study on Field Measurement of Damping Ratio and its Wind-induced Effects for Super Large Cooling Towers

作　　者：柯世堂[1] 余玮[1] KE Shitang;YU Wei(Department of Civil Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学土木工程系

出　　处：《湖南大学学报（自然科学版）》2019年第5期64-75,共12页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51761165022,51208254,51878351);江苏省优秀青年基金项目(BK20160083);中国博士后科学基金资助项目(2013M530255,1202006B);江苏高校青蓝工程项目~~

摘　　要：以国内7座大型冷却塔现场实测阻尼比识别数据为基础,选取其中高位收水冷却塔为对象,基于实测阻尼比取值范围设置4种阻尼比(分别为0.5%、1%、2%和3%)计算工况进行风振响应完全瞬态分析,并将计算结果与规范阻尼比(5%)下的风振响应进行对比.在此基础上,提炼出了阻尼比取值对高位收水冷却塔风振平均和脉动响应特性的影响,并基于5种风振响应及3种等效目标计算了不同阻尼比下的风振系数,探讨并归纳了不同阻尼比、响应目标和位置对结构风振系数取值的影响规律,最终采用非线性最小二乘法提出了以阻尼比和子午向高度为目标函数的风振系数拟合公式.主要结论可为此类高位收水冷却塔风振动力分析阻尼比取值提供科学依据.Based on the identification data of damping ratios measured from seven large cooling towers in domestic and taking the high-level water cooling tower as an object, four kinds of damping ratios (0.5%, 1%, 2% and 3% respectively) were set up to calculate the wind-induced responses by complete transient analysis. The calculated results were compared with these calculated under standard damping ratio (5%). On this basis, the influence of the damping ratio values on average and pulse responses of wind vibration of high-level water cooling tower was refined, the wind-induced vibration coefficients were calculated based on six different responses of wind vibration and three kinds of equivalent target under damping ratios. The influence law of different damping ratios, response targets and position on coefficients of wind vibration were summed up, and the damping ratio and meridian height were taken as an objective function of the wind vibration coefficients and the fitting formula was proposed by using the nonlinear least-square method. The main conclusion can be provided as references for damping ratio parameters of the high-level water cooling tower.

关 键 词：高位收水冷却塔 阻尼比 风振响应 风振系数 瞬态分析 参数分析 

分 类 号：TU279.741[建筑科学—建筑设计及理论]