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风荷载是大型冷却塔建筑设计的主要荷载之一,通过风振时域分析可以全面地了解塔身的风振响应特性。本文探讨了采用线性滤波法中的自回归模型(auto-regressive,AR)模拟大型冷却塔风致振动响应的数值方法。首先根据AR模型,基于随机模拟方法,计算冷却塔表面不同高度的随机脉动风压。通过将随机脉动风压和平均风压作为冷却塔表面的外载,采用有限元分析软件计算某冷却塔的风致振动响应。结果表明,基于随机脉动风荷载模拟的数值计算方法,能正确反映冷却塔塔身的风振响应。该方法特别适用于冷却塔高度超出规范要求的情况下,评估冷却塔的风振响应。
Wind load is one of the main loads in the design of large-scale cooling tower. Through wind-induced time-domain analysis, the wind-induced response characteristics of the tower body can be fully understood. In this paper, a numerical method for the wind-induced vibration response of a large cooling tower using auto-regressive (AR) linear filtering is discussed. First, according to AR model, based on stochastic simulation method, calculate the random fluctuating wind pressure at different height of cooling tower surface. By using random fluctuating wind pressure and average wind pressure as the external load on the cooling tower surface, the wind-induced vibration response of a cooling tower is calculated by finite element analysis software. The results show that the numerical calculation method based on the random fluctuating wind load can correctly reflect the wind-induced vibration response of the tower. This method is especially suitable for evaluating the wind-induced vibration response of cooling towers where the height of the cooling tower exceeds the specification.