Field investigation on wind loads of a low building with adjustable roof pitch near sea

A low building and a tower were constructed near Shanghai Pudong International Airport by east china sea in order to investigate characteristic of wind field and wind pressure on the roof surface of the low building.The remarkable feature of the low building was that its roof pitch can be adjusted between 0°and 30°,so that the impact of different roof pitches on the wind pressure of the roof can be analyzed.Firstly,three ten-minute wind pressure time-histories with different roof pitches of 0°,10° and 20° were analyzed,respectively.And then comparison was made with the wind tunnel test data of a rigid model with 1∶30 scale.It was shown that the distributions of the mean pressure and the fluctuating one agree well with the wind tunnel test results.Next,the stationarity of wind velocity and wind direction angle and the correlation between them were analyzed.It was discovered that the coupling effect between them is evident;the impact of the vertical wind direction angle on fluctuating wind velocity is large;the correlation coefficient is about-0.5 without time delay.Finally,the non-Gaussian characteristic of the wind pressure was investigated.It was shown that there exists a linear relation between skewness and kurtosis,and the fitting formulas for skewness and kurtosis are presented with 0°,10°,and 30°roof pitches.