Study On Wind Loads For Long-Span Dry-Coal-Shed And Simulation Of Non-Gaussian Wind Pressure Field

With the development of China’s power industry, dry-coal-shed structures for the storage of coals have been widely used. Due to process requirements, dry-coal-sheds are generally open structures. The air will pass through from the inside, and the aerodynamic flow around its role is very complex. Therefore, the wind tunnel test of long-span open dry-coal-shed is very necessary. Meanwhile, considering the role of separated flow in some important areas, wind loads often exhibit strong non-Gaussian characteristics. Simply refering to load code, the values of peak factors are often too small, resulting in unsafe design wind loads. So it is particularly important for how to calculate the peak factors of non-Gaussian processes. However, because of various conditions, the time histories of wind loads given from wind tunnel test are not enough long. It causes difficulty to meet the requirements of study on non-Gaussian wind load. Thence, it is worthwhile to obtain long-distance non-Gaussian wind loads that meeting certain conditions with the use of numerical simulation methods.Firstly, this paper introduced the development of dry-coal-sheds and the study on wind design for long-span roof structure, peak factors for non-Gaussian processes and the simulation methods of non-Gaussian wind pressure. Secondly, based on the wind tunnel test of long-span open dry-coal-shed, the study on surface pressure and shape coefficient distribution at different wind angles and coal piles cases was carried out. Thirdly, it compared the distributions of wind loads higher-order statistics for long-span open dry-coal-shed under different wind angles and coal piles cases, and analyzed the sensitivity to time dates for the higher-order statistics. Then, the author proposed various mixture probability distribution models of wind pressure to improve calculation methods of peak factors, and compared the accuracy and applicability of each method under different time dates and coal piles cases. Fourthly, the wind vibration responses of long-span open dry-coal-shed lattice shell structure were analyzed in time domain. And the wind vibration factors were calculated in three different targets equivalent to wind effect. Furthermore, the author compared the effectiveness of three equivalent static wind loads corresponding to the wind vibration factors under different coal piles cases. Lastly, a simulation method of single non-Gaussian process had been improved based on Hermite polynomial. Then combined with the proper orthogonal decomposition method, the author proposed a new simulation method of non-Gaussian wind pressure field. The example of wind tunnel test for long-span open dry-coal-shed was used to evaluated the simulation results.