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.
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