Study On Wind Induced Vibration Characteristics And Equivalent Static Wind Loads Of Long-span Roof Structure

Over the last decades, long-span roof structures which become big public building preferred structural style, such as railway station、 airport terminal、 stadium, showed flourishing developmental trends at home and abroad.The mass of long-span roof structures become more and more light and the span become more and more large so that the wind load plays a more obvious role, which even become the main load controlling the structural design. What’s more, the theory of long-span roof structures is not perfect, so that, to a certain extent, the development of long-span roof structure is restricted. Therefore, the study of long-span roof structures is of great significance.This paper takes the Changzhou airport terminal building as research object in rigid model wind tunnel test, adopting and processing the wind tunnel test data, and then using the finite element software to analyze the wind-induced vibration responses and equivalent static wind loads.Main contributions of the work are as following:(1) The first part of this paper elaborates domestic and foreign large span-roof structures development status. Main characteristics of near ground wind and main research methods of wind engineering are discussed.(2) The second part of this paper introduces the rigid model wind tunnel test, including model, equipment, and arrangement of measuring points. The results of the analysis are gained, and then some distribution rules of wind pressure on the surface of large span-roof structure are obtained.(3) In the third part, the wind induced vibration response calculation methods are discussed, the finite element analysis model is established. After the results of wind tunnel test data are processed, fluctuating wind pressure time-history could be obtained. The next step is time-history analyses of wind vibration response. Subsequently, the wind vibration coefficient of the Changzhou airport was calculated finally.(4) In the forth part, the wind vibration coefficient, shape coefficient provisions are substituted into the formula of structural design to calculate each partition of the equivalent static wind loads. When the equivalent static wind loads are loaded into the finite element model, the typical cross stress and deflection could be analyzed.