Study On The Wind Induced Vibration Of Super Tall Buildings Considering The Joint Distribution Of Wind Speed And Wind Direction

For the super tall building, it is general realized that the wind-induced response of the building is the largest response when the maximum wind which is not considered with wind angle load on. The response is smaller when the building suffers the other wind direction wind, so it is generally analyzed only when the high-rise building faces the wind condition and the wind speed is the maximum wind which does not consider the role of wind direction. The design under this condition is considered safe. Because the weak axis direct of the building and the maximum wind speed direct may not coincide, and the frequency probability of the wind in this direct is not the greatest, to test the previous idea this article on the one hand, on the other hand in order to optimized design with more information of the wind speed and wind angle, this article research the response of a high-rise building in a different wind direction carefully by means of wind tunnel tests. Combined with the data of the extreme wind speed sample at Chongqing of 30 years, the wind direct factors of the basic wind speed for the different response are derived into account the wind direction and a comprehensive model of the wind factor is proposed considering the Interference factor of the surrounding buildings.In this paper, some works has been studied as follows:?By means of the rigid model wind tunnel test of Super Tall buildings, the amplitude characteristics, frequency domain characteristics and correlation of the wind pressure of the Super Tall Building under the typical wind direction is analyzed in order to have a comprehensive understanding of wind pressure characteristics.?based on the rigid model wind tunnel test of Super Tall buildings, the layer wind force coefficient amplitude characteristics, frequency characteristics and spatial correlation of Super Tall Building with typical wind direction is detailed studied. The change of the mean value, the root variance, the spectrum and the vertical correlation of the wind force coefficient with the height of the layer and the wind direction is discussed in detail and the mathematical model of the layer wind load of the super tall building is established.?Based on the multiplication theorem of probability theory, the joint distribution of wind speed and direction model has been acquired. Basis on the sample data of extreme wind speed and direction of Chongqing for 30 years, the joint distribution of wind speed and direction model of the Chongqing region is studied and a joint probability density function model of the wind speed and direction is established. Varieties of typical probability distribution models for Conditional probability density model of the wind speed are compared and it can be found that the lognormal probability model is better. For the wind direction, a modified probability histogram is used and the mixed probability density model composed by 3 parameter Weibull distribution and uniform were used to fit. It can be found that the mixed probability model can meet the probability of compatibility principles.?According to the established wind loads mathematical model, using random vibration analysis, the pulsating response of the Super Tall Building in typical wind direction is calculated in the frequency domain. Associate with the mean response, the total response is obtained. The Response Ratio in typical wind direction can be calculated through comparing the response of the super tall building in typical wind direction with the response when the weak axis direct of the building and the maximum wind speed direct coincide. The frequency-domain results are the same as the time-domain results, which in turn verified the validity of the above load model. The Response Ratio at some non-0 attack angle is greater than zero which demonstrates that considering this condition is necessary. Finally, the effect of the dynamic characteristics of the building and wind field parameters on the Response Ratio is discussed in detail, and the conclusion can be made that the effect of the building height is large and the other parameters effect can be ignored.?According to the joint probability density function mode of wind speed and direction, the basic wind speed of each wind angle in 100 years is calculated. It is found that the maximum wind speed of each wind angle in 100 years and the basic wind speed without considering the wind angle is basically the same, which verify the effective of the sampling and the reasonable of the method. Then the basic wind speed ratio can be obtained. Associate with the Response Ratio, the Response Wind Angle Coefficient of the super tall building and the equivalent basic wind speed under the conservative directions can be calculated, and then the Direction Factors of the basic wind speed for the different response can be obtained. Finally, consider the impact of surrounding buildings, the Composite Direction Factors combine with the Interference Factor can be obtained, which can be used for the sophisticated analysis and design of the super tall building.