Study Of Interference Effects Of Wind Load And Wind-induced Response On Stadium's Double Canopy Roofs

The stadium canopy roof belong to long-span cantilever structure, and also is the main carrier of structure development technology application .As a new structure, it not only has the same characteristic as long-span structure, such as generally light, flexible and low damping, but also the upper and down surface of it's roof will endure wind pressure meantime when it is in wind. So its actual pressure is the composition of its roof, and it is wind tenderness structure.Taking the stadium of Mongol Wuhai Olympic center as project background in this paper, by adopting wind tunnel test with synchronously measured pressure on the rigidity model with three cases, including west cantilever roof only, east cantilever roof only and double cantilever roves. As the test data, we have studied the interference effects between two coverings, with opposite position, similar spans, different altitude and the structures shape have the representation, including total wind suction, the distribution of average and fluctuating wind pressure coefficients, the wind pressure power spectrum of main test points and structure power response, etc. construct finite element model ANSYS of the two roves. Using the method of conformation No-Steady force to get the actual wind pressure, and then making use of the data, the modal and time domain analysis method to calculate the wind-induced response of these two roves. To analysis interference effect further. After analysis the structure modal, and base on wind pressure to calculate generalized force spectra, using method of modal superposition to developed the Frequency-domain dynamic computing program-SFSP under the circumstance of stationary random stimulation. In the process of developing the program, the effect of cross spectra and terms of modal are considered. Using the program to analyze the interference effect in the aspect of wind-induced response. Take the result to compare with the results that have been computed with Time domain analysis method. It indicated that: the conclusions that we gained from the method of Frequency-domain are the same with Time domain analysis method in the aspect of wind-induced response, and we should consider many models'effects if we adopt the method of Frequency-domain analysis.