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Experimental research on design wind loads of a large air-cooling structure

机译：大型空气冷却结构设计风荷载试验研究

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摘要

Because of the particularity and complexity of direct air-cooling structures (ACS), wind parameters given in the general load codes are not suitable for the wind-resistant design. In order to investigate the wind loads of ACS, two 1/150 scaled three-span models were designed and fabricated, corresponding to a rigid model and an aero-elastic model, and wind tunnel tests were then carried out. The model used for testing the wind pressure distribution of the ACS was defined as the rigid model in this paper, and the stiffness of which was higher than that of the aero-elastic model. By testing the rigid model, the wind pressure distribution of the ACS model was studied, the shape coefficients of "A" shaped frame and windbreak walls, and the gust factor of the windbreak walls were determined. Through testing the aero-elastic model, the wind-induced dynamic responses of the ACS model was studied, and the wind vibration coefficients of ACS were determined based on the experimental displacement responses. The factors including wind direction angle and rotation of fan were taken into account in this test. The results indicated that the influence of running fans could be ignored in the structural design of ACS, and the wind direction angle had a certain effect on the parameters. Moreover, the shielding effect of windbreak walls induced that wind loads of the "A" shaped frame were all suction. Subsequently, based on the design formula of wind loads in accordance with the Chinese load code, the corresponding parameters were presented as a reference for wind-resistant design and wind load calculation of air-cooling structures.
机译：由于直接空气冷却结构（ACS）的特殊性和复杂性，在一般载荷码中给出的风参数不适用于风蚀设计。为了研究ACS的风力负载，设计和制造了两种1/150缩放的三跨模型，对应于刚性模型和航空弹性模型，然后进行风洞测试。用于测试ACS风压分布的模型被定义为本文的刚性模型，其刚度高于航空弹性模型的刚度。通过测试刚性模型，研究了ACS模型的风压分布，确定了“A”形状的框架和防风壁的形状系数，以及防风壁的稳定因子。通过测试航空弹性模型，研究了ACS模型的风力诱导的动态响应，基于实验位移应答确定AC的风振系数。在该测试中考虑了包括风向角度和风扇旋转的因素。结果表明，在ACS的结构设计中可以忽略运行风扇的影响，风向角对参数具有一定影响。此外，防风壁的屏蔽效果诱导“A”形框架的风力荷载均均抽吸。随后，基于根据中文载荷的风负载的设计公式，将相应的参数作为风冷结构的抗风设计和风力载量计算的参考。

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