The Wind Research Of Steel Float Awning

The stadium with large cantilevered steel roof is becoming more and more popular in each city. While the large cantilevered steel roof has wind sensitive characteristics like that the large span, the small vertical stiffness, light weight, small damp and so on, which makes the wind load become the main control factor. In order to know the three problems (1.the effect of stand on the roof wind load shape coefficient 2. the difference between using different wind spectrums to generate the wind speed to calculate separately 3.whether it should be considering horizontal and vertical wind effect) about the analysis of long-span steel roof more clearly, combined with the actual project--the long-span steel roof of QianWei gymnasium, and do the following:1.Using the CFD numerical wind tunnel technology to establish the numerical model with grandstand and the other one without it to calculate in more than one direction angle, then compared the calculation results to know that the grandstand has a huge influence to the wind load shape coefficients of the long-span steel roof. The wind load shape coefficient of long-span cantilevered roof with a grandstand is twice than the one without a grandstand, and the most unfavorable wind direction is the one opposite the grandstand.2.Compared multiple wind spectrum density value near the natural frequency and made matlab program output multiple wind speed to do the structure dynamic process analysis,then compared the results obtained:when we select the wind spectrum,we should be based on the natural vibration frequency spectrum of the structure.3.Established the finite model which corresponding to the practical project, and using t Davenport spectrum, Kaimal spectrum, Panofsky spectrum to get the all kinds of wind speed to calculate. Compared the results,we can know that the predominant frequency of sensitivity has no difference but the amplitude of the Kaimal spectrum is bigger. So the Kaimal spectrum is more conservative, and the vertical wind does not necessarily increase the wind vibration coefficient, but it will increase the node’s mean displacement. When we design the long-span roof, we should give full consideration.