Study On Wind-Induced Vibration And Equivalent Static Wind Loads For Long-Span Roof Structures

In recent decades, global economy developed rapidly, many long-span roof structures came into being as local landmarks, and the structure feature became lighter and much huger. Wind loading is increasingly becoming one of the dominant loads of structures, wind-resistant design of structure becomes more and more difficult. Actually, the dynamic effect on the structure of natural wind is the culprit of wind-induced damage to the structure, so it’s very necessary to research the wind-induced vibration response of long-span roof structures, which is directly related to the safety of the structure.To show the importance of wind-resistant design of structure, especially long-span roof structures, high-rise structures etc, this paper introduced the state of the development of long-span roof structure, the severity of hurricane damage to the structure, the research status of long-span roof structure wind, and discussed the characteristics of wind loads in the atmospheric boundary layer flow. In the complex atmospheric boundary layer, long-span roof structures mainly suffer fluctuating wind, so the wind-induced vibration response of long-span roof structure is very important.This paper focused on long-span roof structures wind vibration response and calculation of equivalent static wind loads. A detailed study to the method of the wind-induced vibration response of long-span roof structures (time domain method, frequency domain method), and the method of the calculation of equivalent static wind loads (GLF, LRC, IWL etc.) was conducted, the various features of the calculation methods and application conditions were compared.The experimental hall of Tai Lake was taken as an example. The procedure of its rigid model wind tunnel test was introduced, including model making, measuring points, data acquisition and processing, etc are described. By calculating the test results of wind pressure coefficients, the basic law of its roof pressure distribution was obtained.This paper established SAP2000 finite element model of the experimental hall, researched the wind vibration response of the hall’s roof, calculated using different analysis methods, and compared their advantages and disadvantages. Meanwhile it calculated its equivalent static wind loads through different methods, and did comparative analysis.Finally, this paper’s work was summarized, and some problems needing depth study in the future were proposed.