摘要
风效应计算是吸热塔结构设计关键技术之一。本文以一个180m的钢筋混凝土塔筒加40m钢结构吸热器组成的吸热塔为例,该结构质量刚度在转换层处存在突变,结构气动外形、质量分布、振型与烟囱有所不同。基于这些因素本文结合对《太阳能热发电厂吸热塔结构设计规范》(NB/T 11166—2023)的探讨,从质量分布、振型、阻尼比、顺风、横风及风致疲劳等多方面分析混合结构吸热塔风效应计算方法。研究发现计算振型数及振型阻尼比对吸热塔各控制截面荷载效应影响较大;NB/T 11166—2023未给出横风涡激共振判别式,实际工程中可参考《烟囱工程技术标准》(GB/T 50051—2021)进行判别;吸热器及其转换层应当考虑风致疲劳问题;这些问题在实际工程中均需要高度重视。
Wind effect calculation is one of the key technologies in the design of heat-absorbing tower struc-tures.In this paper,a composite heat-absorbing tower consisting of a 180-meter reinforced concrete tower shaft and a 40-meter steel absorber is taken as an example.This structure undergoes a sudden change in mass and stiffness at the transition level,and its aerodynamic shape,mass distribution,and vibration modes differ signifi-cantly from those of a chimney.Considering these factors and discussions related to the"Design Specification for Heat-Absorbing Tower Structures in Solar Thermal Power Plants"NB/T 11166—2023,wind effects are analyzed from various aspects,including mass distribution,vibration modes,damping ratio,headwind,crosswind,and wind-induced fatigue.The study shows that the number of calculated vibration modes and the damping ratio sig-nificantly impact the loading effects at various control sections of the heat-absorbing tower.NB/T 11166—2023 does not explicitly provide a discriminant for crosswind vortex-induced resonance.However,in practical engi-neering,the"Technical Standard for Chimney Engineering"GB/T 50051—2021 could be referred.Wind-in-duced fatigue should be considered for both the absorber and the transition level.All those issues require careful attention in practical engineering.
作者
漆桧
Qi Hui(Sichuan Electric Power Engineering Co.,Ltd,Chengdu 610041,China)
出处
《特种结构》
2024年第3期36-39,共4页
Special Structures
关键词
吸热塔
风效应
振型
阻尼比
疲劳
Heat-absorbing tower
Wind effect
Mode
Damping
Fatigue
