强台风作用下不同退台方式对超高层建筑横风向风效应的影响

发布时间：2018-03-19 20:53

本文选题：超高层建筑　切入点：退台　出处：《建筑结构学报》2016年12期 　论文类型：期刊论文

【摘要】：在边界层风洞模拟的台风风场中,针对考虑立面旋转影响的一系列退台外形超高层建筑模型进行同步测压试验,分析了不同退台方式对建筑的横风向气动力、气动弯矩功率谱密度和风致响应的影响。结果表明:采用退台方式可使建筑侧立面由等截面方式的频率相同的整体漩涡变成若干个频率不同的局部漩涡,从而有效减少了作用在结构上的横风向气动力和风致响应,进一步采用旋转退台方式则可以更好地抑制漩涡的整体性、削减结构横风向气动力并最终降低结构的横风向风致响应;作用于结构的基底气动弯矩取决于经过模态加权处理的气动力的分布,方形截面模型对气动弯矩影响最大的气动力出现在结构高度的80%处;对于不同退台方式的模型,对气动弯矩产生主要影响的仍然是结构顶部的气动荷载,其最大影响高度位于结构高度的80%~90%范围内。与方形等截面结构相比,不同退台方式可以有效降低作用在结构上的横风向风荷载,其降幅为75.0%~79.2%;采用退台旋转方式对横风向荷载的减少量可达91%。
[Abstract]:In the wind field of typhoon simulated by boundary layer wind tunnel, a series of supertall building models with vertical rotation are tested by simultaneous pressure measurement, and the cross-wind aerodynamic forces of buildings with different retreat modes are analyzed. The effect of aerodynamic moment power spectral density and wind-induced response. The results show that the lateral facade of the building can be changed from a monolithic vortex with the same frequency of the same cross section to a number of local vortices with different frequencies. Thus, the cross-wind aerodynamic force and wind-induced response acting on the structure are reduced effectively, and the overall swirl can be better restrained by further adopting the rotation and retreat method. The aerodynamic moment of the substrates acting on the structure depends on the distribution of the aerodynamic force after the modal weighting, and the aerodynamic force of the structure is reduced and the wind induced response of the structure is reduced finally, and the aerodynamic moment acting on the structure depends on the distribution of the aerodynamic force after the modal weighting. The aerodynamic force which has the greatest influence on the aerodynamic moment of the square section model appears at 80% of the height of the structure, and the aerodynamic load on the top of the structure is still the main influence on the aerodynamic bending moment of the model with different detaching modes. The maximum influence height is within 90% of the height of the structure. Compared with the square iso-section structure, the wind load acting on the structure can be effectively reduced by different retreating methods. The decrease is 75.0 and 79.2, and the reduction of cross-wind load can be up to 91.
【作者单位】：华南理工大学亚热带建筑科学国家重点实验室;
【基金】：国家自然科学基金项目(51078146,51278104)
【分类号】：TU973.213

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