基于响应目标的特大型冷却塔优选组合方案

现有冷却塔群组合形式选型主要基于荷载干扰因子来考虑,这一做法难以真实反映冷却塔群结构的受力特征.为研究基于静风响应目标的四塔组合优选方案及特大型冷却塔在不同四塔组合下的综合受力性能,本文以在建世界最高冷却塔(220 m)为工程背景,分别对串列、矩形、菱形、L形和斜L型5种典型四塔组合冷却塔群共320个工况进行了同步刚体测压风洞试验.获取了5种四塔组合形式下各工况冷却塔表面风压分布模式,并基于有限元方法建立了"塔筒-支柱-环基"一体化仿真计算模型,分别对不同组合形式、来流风向角和塔群相对位置工况进行了三维非对称风荷载作用下的特大型冷却塔静风响应分析,探讨了7种典型响应目标下四塔干扰作用对特大型冷却塔风致位移响应及内力响应影响规律.在此基础上,综合对比研究了不同静风响应指标的影响程度与分布规律.最终,基于静风响应目标综合定性地给出了四塔组合形式的优选方案,其中的串列组合布置方案抗风性能最优,菱形、斜L形、矩形和L形组合抗风性能依次递减.

Optimal combination scheme for super-large cooling towers based on response targets

The selection of current cooling tower group is mainly based on load interference factor, which it is difficult to truly reflect the force characteristics of the cooling towers group. To study the four-tower combination optimization scheme based on the static wind response target and combined stress performance of super-large cooling tower in different four towers combinations, with the under-construction of the world''s highest cooling tower(220 m) as the engineering background, the synchronous rigid body pressure measurement by wind tunnel tests were respectively carried out for five typical four towers combined cooling tower groups, including tandem, rectangular, rhombus, L-shaped and oblique L-shaped, totally having 320 working conditions. The surface wind pressure distribution pattern of cooling towers under different four tower combinations was obtained, and an integrated simulation model of "tower barrel-stanchion-ring foundation" was established based on the finite element method. The static wind responses of super-large cooling towers under three dimensional asymmetrical wind loads were analyzed respectively for different combinations, currents, wind directions and relative positions of towers, in which the influence law of four tower interference on the force and displacement response of the cooling tower under seven typical response targets was discussed. The influence degree and distribution law of different static response indexes were studied. Based on the static wind response target, the optimal scheme of the combination of four towers was given qualitatively. The results show that wind-resistant performance of the tandem layout is optimal, and the wind-resistant performance of the rhombic, oblique L-shaped, rectangular and L-shaped layouts are gradually reduced.