Analysis On Wind Vibration Response Of The Large- Span Lattice Structures With The Self-oscillating Of Roof And The Fluid-structure Coupling Effect

To satisfy the demand of moden architecture aesthetics and functions, large-span roof structures are widely used. Because of the irregular shape and the increase of span, the structures are sensitive to the wind load. Then the wind load, especially the fluctuate effect of the wind become more important in the design of the structure. But, because of the shortage of study in the wind-induced response on the large-span space structure, the correlative rules in the'Load code for the design of building structures (GB50009-2001) can only be obtained from the research of the tall building structures. Then it is a hidden danger to the large-span structures.The characters of the wind load of large span structure and the basic calculated methods are presented. Some simulation methods of wind speed, for example, regular harmony superposition method, update harmony superposition methods and linear filtering method are introduced. These methods are programmed to simulate wind speed. By comparison, FFT update harmony superposition method can not only largely increase the computational efficiency without decrease the precision. It is fit to simulate wind load which is used to analyze the large-span structures. To consider the self-oscillating effect of roof and the fluid-structure coupling effect, a new calculated method of wind load is deduced, and it is used in the analysis of Laoshan Cycling Velodrome and Tianjin Olympic stadium. It can be seen from the result that because of the self-oscillating effect the largest wind vibration coefficient of the structure increase respectively by 37.9% and 10.9% for these structures, and because of the fluid-structure coupling effect it decrease by 22.3% and 20.5%.