Wind Vibration Response Study On Large Span Stadium Roof With Cantilevers

The value of wind shape coefficient and wind vibration factor is vital to structure design. Wind shape coefficient manly depends on building outline. Because of unique shape, wind shape coefficient of stadium roof should be got by wind tunnel test or numerical wind tunnel simulation. Wind vibration factor lies on characteristics of wind and structure. It can be figured out in time domain or frequency domain method. Taking a stadium in Lubango of Angola as an example, this paper performed the study of wind resistance. The accomplishment is as follows:1. Characteristics of wind are represented. Average wind is introduced and calculation method in load code is mentioned. At the same time, this dissertation figures out the dynamic effect of fluctuating wind, turbulence intensity and fluctuating wind spectrum.2. On the basis of former research achievement, the numerical discrete form of averaged Navier-Stokes equation for turbulent wind flow is established and its discretization form and method are given. Then, advantages and disadvantages of different kinds of turbulence models are explained.3. Based on the theory above, Numerical wind tunnel simulation is operated on Lubango stadium roof in RNG k-εturbulence model by cfx program to investigate average wind pressure. Results in different orientations are treated, then average wind pressure and wind shape factor are presented. After that, the feature of average wind pressure on complex roof with double large cantilevers is recommended.4. Random vibration theory is elaborated. PSD analysis is operated on stadium roof and the wind vibration factor by frequency domain method is worked out.5. Digital simulation of fluttering wind is worked out in matlab, which can create wind velocity time-history data considering stochastic nature, time correlation and spatial correlation. Besides, transient analysis of fluctuating wind is performed on stadium roof by ansys program. Result is dealt, and wind vibration factor is calculated. Compared with result by frequency domain method, this paper recommends the most proper value of wind vibration factor for structure design.