In order to study the wind-induced performance of super-large steel structure cooling towers, a super-large hyperbolic 216.3m-high cooling tower comprising a double-layer steel-truss structure with steel-sheet cladding was taken as a case study. The dynamic characteristics of this cooling tower were analyzed and compared with those of a similar-scale reinforced concrete cooling tower. Then, fluctuating wind loads measured in wind tunnel tests were applied directly to a structural finite-element model based on proper orthogonal decomposition and reconstruction of the wind pressures. The displacement response of the cooling tower was subsequently obtained by full transient dynamic analysis, and then the distribution characteristics of mean response, the mode participation contribution of the fluctuating displacement responses, the wind-induced vibration factors and the influence of structural damping ratio were investigated and compared with those of a concrete cooling tower. The comparison results mainly show that the steel-structure cooling tower has higher natural vibration frequencies, a lower-order number of lateral overturning mode (indicating a higher risk of overturning collapse), simpler resonant modes, smaller variance ratio of resonant component and weaker sensitivity of dynamic response to structural damping. The study results could assist in wind resistance design of similar super-large steel-structure cooling towers.

为了研究超大型钢结构冷却塔的风致性能，以216.3m高的超大型双曲线冷却塔为例，该冷却塔由双层钢桁架结构和钢板覆盖层组成。分析了该冷却塔的动力特性，并将其与类似规模的钢筋混凝土冷却塔的动力特性进行了比较。然后，基于适当的正交分解和风压的重构，将在风洞测试中测得的波动风载荷直接应用于结构有限元模型。随后通过全面的瞬态动力分析获得冷却塔的位移响应，然后得出平均响应的分布特性，波动位移响应的模式参与贡献，研究了风致振动因素和结构阻尼比的影响，并与混凝土冷却塔进行了比较。比较结果主要表明，钢结构冷却塔具有较高的固有振动频率，较低的横向倾覆模数（表明倾覆倒塌的风险较高），较简单的谐振模态，较小的谐振分量变化率和较弱的灵敏度对结构阻尼的动态响应。研究结果可以帮助类似超大型钢结构冷却塔的抗风设计。较低的横向倾覆模式数量（表明倾覆倒塌的风险较高），更简单的共振模式，更小的共振分量方差比以及对结构阻尼的动力响应灵敏度较弱。研究结果可以帮助类似超大型钢结构冷却塔的抗风设计。较低的横向倾覆模式数量（表明倾覆倒塌的风险较高），更简单的共振模式，更小的共振分量方差比以及对结构阻尼的动力响应灵敏度较弱。研究结果可以帮助类似超大型钢结构冷却塔的抗风设计。