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Original scientific paper

https://doi.org/10.14256/JCE.3319.2021

Effect of roof heights on dynamic characteristics of wind pressure on square low-rise buildings

Tingting Liu
Dongzhi Wang
Hongfu Zhang
Dabo Xin


Full text: croatian pdf 4.564 Kb

page 265-276

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Full text: english pdf 4.564 Kb

page 265-276

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Abstract

The high suction induced by strong wind on a flat roof can result in severe local damage or even in the overturning of the entire roof. The roof height has a significant effect on characteristics of the high wind suction force. The wind pressure on flat roofs of various heights is investigated in this paper. The extreme wind pressure and its position are firstly studied at different wind incidence angles. Proper orthogonal decomposition (POD) and coherence function analyses are then conducted to analyse dynamic characteristics. The results show that the local extreme pressure increases with an increase in roof height. The fluctuation of the separation bubble also increases, and there exists a mode competition of the first two POD modes. On the contrary, the roof height has fewer effects on conical vortices. In addition, two coherent regions (conical vortices) are observed on the roof. Although these two regions have small correlation coefficients, they have a considerably high coherence function at low frequency. These results are expected to contribute to better understanding of high suction characteristics on flat roofs, and can potentially provide guidance for avoiding roof damage induced by strong wind suction.

Keywords

wind pressure; flat roof; conical vortices; various roof heights

Hrčak ID:

277957

URI

https://hrcak.srce.hr/277957

Publication date:

24.5.2022.

Article data in other languages: croatian

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