Characteristics Of Wind Loads On Super High-rise Buildings Under Active Suction Control And Passive Aerodynamic Control

In order to alleviate the contradiction between population explosion and limited land for construction, super high-rise buildings have become an increasingly attractive topic in civil engineering structures. Due to the extensive utility of advanced construction technology, and high-strength and light-weight materials, the buildings are getting higher and higher, and the wind loads will gradually become the dominant factor in their structural design. According to previous researches, taking aerodynamic measures, including active aerodynamic control and passive aerodynamic control, is a very effective mean to improve the wind-resistant performance of super high-rise buildings. As for the passive aerodynamic control, wind engineering researchers have already conducted extensive investigations, however, study on the active aerodynamic control of wind loads on high-rise buildings is just a new topic, and much research need to be carried out.Under the circumstances, in order to reduce the wind loads and improve the wind-resistance performance of super high-rise buildings, we combine both the active suction control and the passive aerodynamic control to study their effect on the characteristics of wind loads on super high-rise buildings. The main contents in the dissertation are shown in four aspects as followings:1. The existing suction control device has been improved to achieve a more powerful suction control. Also five types of rigid super high-rise building models(including a basic model, a corner recessed model, a corner cutted model, a tapered model and a Y-type model) are designed and manufacted based on the prinicple of same-height and same-volume, and also the program of wind tunnel test are completed. Besides, CFD techniques are used to compute the mean wind loads on super high-rise buildings with different geometric parameters(including corner recession rate, corner cutting rate and tapered rate), so as to obtain the optimal geometric parameters.2. Wind tunnel tests of five types of rigid super high-rise building models under passive aerodynamic control are accomplished. Based on the wind tunnel test results, effects of passive aerodynamic controls and wind direction on characteristics of the mean and fluctuating wind loads on the models are analyzed.3. Wind tunnel tests of five types of rigid super high-rise building models under both passive aerodynamic control and active s uction control are accomplished. Based on the wind tunnel test results, effects of suction flux coefficients and wind directions on characteristics of the mean and fluctuating wind loads on the models are analyzed. And they are compared with the effects on the same models under passive aerodynamic control, proving the superiority of active and passive aerodynamic control.4. To validate feasibility of the numerical methods and accuracy of the wind tunnel test(WTT) results, typical WTT cases are numerical investigated, using the Reynolds-averaged Navier-Stokes(RANS) method based on the RSM turbulence model. And the numerical results, including distribution of the average pressure coefficients and overall aerodynamic coefficients, are compared with the WTT results.The results show that the CFD numerical results and WTT results exhibit good agreement. Afterwards, the CFD method is used to explore the rational location of suction orifice on the corner-recessed suction model and Y-type suction model. Lastly, the detailed flow fields and turbulent kinetic energy fields around the super high-rise building models are analysed, and the mechanism of active suction control and passive aerodynamic control over the wind loads reduction is clarified.