Frequency domain characteristics of wind pressure on a high-rise building under thunderstorm downburst

被引：0

作者：

Fang Z. ^{[1
]}

Wang Z. ^{[1
,2
]}

Li Z. ^{[1
,2
]}

机构：

[1] School of Civil Engineering, Chongqing University, Chongqing

[2] Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing

来源：

Zhendong yu Chongji/Journal of Vibration and Shock | 2020年 / 39卷 / 07期

关键词：

Coherence function; High-rise building; Impinging jet; Power spectrum; Thunderstorm downburst;

D O I：

10.13465/j.cnki.jvs.2020.07.008

中图分类号：

学科分类号：

摘要：

In order to study frequency domain characteristics of wind pressure on a high-rise building under thunderstorm downburst, an impinging jet device was used to simulate thunderstorm downburst, and pressure tests were conducted on a rectangular high-rise building model under simulated thunderstorm downburst. According to test data, power spectral density, correlation coefficients in horizontal and vertical directions and coherence functions in horizontal and vertical ones of fluctuating wind pressure were analyzed in detail. Effects of radial position of the model on fluctuating wind pressure's frequency domain characteristics were discussed. The results showed that power spectral density of fluctuating wind pressure on the model's windward surface at radial position is basically consistent to that of incoming flow wind speed spectrum; energy of fluctuating wind pressure on sides and leeward one is mainly concentrated at vortex shedding frequencies; correlation of wind pressures decreases with increase in distance between measured points; coherences in horizontal and vertical directions of wind pressures on windward side are stronger, and synchronization of fluctuating wind pressures is better; horizontal coherence of wind pressure on sides is more significant when the reduction frequency is less than 0.2, and its vertical coherence is relatively better within the whole frequency range; coherences in horizontal and vertical directions of wind pressure on leeward side are stronger when the reduction frequency is less than 0.1, and coherence quickly weakens with increase in the reduction frequency; there is a stronger horizontal coherence between wind pressures on windward side and leeward one near the reduction frequency of 0.06; when phase angle difference is about 180°, fluctuating wind pressure reveals the opposite phase characteristics. © 2020, Editorial Office of Journal of Vibration and Shock. All right reserved.

引用

页码：51 / 58and73

页数：5822

共 15 条

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