Mechanism Of Wind Pressure Acting On Large Steel Tank Based On POD And SPT Decomposition

Steel storage tanks are the main oil storage facilities,with the increasingly lack of land resources,steel storage tanks volume become bigger,and the construction of the large steel storage tanks are more and more popular.Large steel storage tanks,on the other hand,are typical wind sensitive structures,and easy to happen to wind induced buckling failure in recent year.The wind resistance of large steel storage tanks is major one of the key scientific issues that need to be solved in engineering practice.In this paper,on the basis of existing research,through the use of Proper Orthogonal Decomposition and Spectral properTransformation,mechanism of wind pressure of the large steel storage tanks is analyzed.The main work includes the following several aspects:1)In order to analyze Reynolds number effectbetter,we redefined the reduced turbulence degrees to represent the wind turbulence characteristics,to analyze the wind pressure of large steel tanks in the height to diameter ratio of 0.875,0.323changing with the Reynolds number in the four kinds of turbulent wind field from a new Angle.On this basis,comparing the wind load around the exposure and flat-topped large steel storage tanks in the height to diameter ratio of 0.556,0.323.2)From the perspective of the random field decomposition,this paper introduces the basic principle of POD,SPT decomposition and its application in wind engineering,taking tall building with rectangular section as an example,using the method of POD and SPT to decompose the building's wind field in the height 0.6 H,the results showed that using the method of POD combined with SPT decomposition can effectively identify wind pressure mechanism.3)Using the method of POD and SPT to decompose the large flattop tanks' wind field with the high to diameter ratio of 0.556,0.323,to identify the mechanism of wind pressure,which can be compared with the characteristics of the two-dimensional cylindrical's modal.The results show that the two-dimensional cylindrical's wind load was dominated by downwind vortex-induced incentives,with the decrease of the height to diameter ratio,the effect of wind turbulence excitation was bigger and became the dominant mechanism.4)Using the method of POD and SPT to decompose the large opentop tanks' wind field with the high to diameter ratio of 0.556,0.323,to identify the mechanism of wind pressure.It can be found that under the same condition of high to diameter ratio,the absent of the roof makes the downwind aerodynamic incentive became smaller.