钢筋混凝土吸热塔顺风向风振响应特征与影响因素分析

Analysis of wind-induced response characteristics and wind vibration coefficient influencing factors of a reinforced concrete solar tower

为获得吸热塔塔架顺风向的风振响应特征,研究吸热塔风振系数的影响因素,以某钢筋混凝土吸热塔为例,采用有限元软件ABAQUS建立优化前后的吸热塔结构模型,通过时程分析方法对结构进行动力响应分析,计算结构的风振系数并与规范取值进行对比。结合吸热塔的结构特点,研究顶部集中质量、塔架体型和阻尼比取值对风振系数的影响。分析结果表明,由于未考虑吸热塔顶部附加集热器质量及高阶振型的影响,现行规范取值与数值模拟值存在一定差距,且吸热塔的体型和阻尼比等自身结构特性也会对其风振响应和风振系数计算结果产生影响。

To obtain the wind-induced response characteristics and study the wind vibration coefficient influencing factors of the solar tower,the structural models of a reinforced concrete tower before and after optimization are both established by the finite element software ABAQUS.Dynamic time history analysis is applied to the established tower model and then the wind vibration coefficient is calculated and compared with the code one.Considering the structural characteristics of the solar tower,the influence of the top concentrated mass,tower shape and damping ratio on wind-induced vibration coefficient is also studied.It is shown that the ignorance of the concentrated mass at the tower top and higher order modes result in the difference between the code value and the numerical simulation results.Besides,the shape and damping ratio also affect the wind-induced response and vibration coefficient of the solar tower.