随机干扰作用下冷却塔结构动态响应的数值分析  

Numerical Analysis of Dynamic Response of Cooling Tower Structure under Random Disturbance

作　　者：刘少杰 唐怀平[1] LIU Shaojie;TANG Huaiping(School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学力学与航空航天学院,四川成都610031

出　　处：《成都大学学报（自然科学版）》2022年第4期414-422,共9页Journal of Chengdu University（Natural Science Edition）

基　　金：国家自然科学基金项目(51778548)。

摘　　要：双曲型冷却塔为钢筋混凝土薄壳结构,其特点是体积庞大且自重轻,在结构设计中,必须系统分析冷却塔在风荷载和地震荷载作用下的结构复杂响应,以评价其易损性和安全性.针对某高度180 m的大型双曲冷却塔,首先建立塔筒—支柱—环基—刚性地基耦合模型,采用混凝土损伤塑性模型,计算冷却塔前50阶模态参数;其次基于结构随机振动理论和方法,采用线性滤波器的AR法拟合脉动风压时程曲线,用ABAQUS软件分析冷却塔的脉动风致响应;选取San Fernando波作为输入荷载分析冷却塔地震响应;最后考虑脉动风和地震波共同作用,分析冷却塔的复杂耦合动力响应.结果表明,基于随机干扰模型的冷却塔结构复杂响应的数值模拟能有效评价其风振响应和地震响应.The hyperbolic cooling tower is a reinforced concrete thin shell structure,which is characterized by large volume and light weight.In the structural design,systematic analysis of the complex structural response of the cooling tower under the action of wind load and earthquake load is required to evaluate its vulnerability and safety.This study focuses on a large hyperbolic cooling tower with a height of 180 m.Specifically,a tower-pillar-ring foundation-rigid foundation coupling model is established,and a concrete damage plastic model is used to calculate the first 50 modal parameters of the cooling tower.Secondly,based on the structural random vibration theory and methods,the pulsating wind pressure time-history curve was fitted by the AR method of linear filter,and the pulsating wind-induced response of the cooling tower is analyzed by the abaqus software.Moreover,the San Fernando wave was selected as the input load to analyze the seismic response of the cooling tower.The combined action of pulsating wind and seismic wave was considered to analyze the complex coupled dynamic response of a cooling tower.The results show that the numerical simulation of the complex response of the cooling tower structure based on the random disturbance model can effectively evaluate its wind-induced response and seismic response.

关 键 词：随机干扰 冷却塔 数值模拟 风致响应 地震响应 

分 类 号：TU311.3[建筑科学—结构工程]