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针对传统三分量方法中采用SRSS组合背景分量和共振分量获得脉动风总响应的局限,在结构动力学和随机振动理论基础上,推导出结构脉动风总响应的实际理论组合计算式,提出用于补偿背景分量和共振分量之间耦合项的一致耦合法来求解结构的风致响应。该方法从理论上适用于任一复杂柔性结构的风致响应精细化分析。以某大型自然博物馆柔性钢结构为例,采用一致耦合法以及改进的三分量方法进行风致响应计算,并与全模态完全二次型(CQC)法计算结果进行对比分析,结果表明:背景、共振及其交叉项分量均需考虑,其中又以共振分量为主导,并且共振模态之间的耦合效应显著,背景和共振分量之间的交叉项也不能忽略。一致耦合法具有较高的精度和稳定性,是此类结构风振响应机理分析的有效方法。
Aiming at the limitation of obtaining the total response of pulsating wind using the combination of background component and resonance component of SRSS in the traditional three-component method, based on the structural dynamics and stochastic vibration theory, the theoretical calculation formula of the total response of the structure fluctuating wind is deduced. The uniform coupling method of compensating the coupling term between the background component and the resonance component is used to solve the wind-induced response of the structure. This method is theoretically applicable to the refinement of wind response in any complex flexible structure. Take the flexible steel structure of a large natural museum as an example, the wind-induced response is calculated by the uniform coupling method and the improved three-component method, and compared with the CQC method. The results show that the background, Resonance and its crossover components need to be considered, of which the resonance component is dominant, and the coupling effect between resonance modes is remarkable. The cross term between the background and the resonance component can not be neglected either. The uniform coupling method has high accuracy and stability, which is an effective method to analyze the wind-induced response mechanism of such structures.