| In recent years,with the rapid development of China’s petrochemical industry,the small and medium-sized petrochemical storage tanks have been unable to meet the requirements of the development of petroleum reserves,and the large-scale storage tank structure is the inevitable requirement of the strategic development of petroleum.Compared with small storage tanks,large petrochemical storage tanks have the advantages of saving investment,saving steel,small footprint,easy management,and reducing energy consumption.On the other hand,petrochemical storage tank structure belongs to wind sensitive structure due to its large diameter to thickness ratio and small height to diameter ratio,which is prone to instability and failure under strong wind.At present,there have been many wind-damaged accidents of storage tanks all over the world,which have caused serious economic losses.Thus,it is obliged to study its wind load characteristics.In this paper,the wind load characteristics of a large floating roof tank and the disturbance effect of a group tank are systematically studied by wind tunnel test and numerical simulation.The main work includes the following aspects:(1)In the wind tunnel test of single storage tanks,wind tunnel test models of petrochemical storage tanks with height to diameter ratios of 1.5,1.0,0.5 and 0.2 were designed to complete the wind tunnel pressure test of storage tanks with five kinds of floating roof heights and two kinds of roof forms.The numerical simulation grid scheme and turbulence model were determined by comparing with the experimental results,and the simulation of three arrangement modes of group tanks with height to diameter ratios of 1.0,0.5 and 0.2 was completed.(2)Investigate the results of different height-diameter ratios,floating roof heights and top cover forms of storage tanks in wind tunnel tests,and compare the wind pressure distribution on the inner and outer walls of storage tanks and the influence rules of various factors on the wind pressure coefficient on the inner and outer walls of storage tanks.The increase of floating roof height is very disadvantageous to the load of the tank with relatively small height diameter,and it has the greatest influence on the inner wall wind pressure of the tank.The position of maximum negative pressure of flat roof cover and curved roof cover is different.The wind pressure coefficient on the windward side of the tank with small opening and height diameter is larger,and the tank is easy to be affected by the larger pressure and may cause local instability failure.Based on the above results,the shape coefficient of the cylinder structure with height to diameter ratio less than 1 was fitted for reference in the structure design of the storage tank.(3)Based on the numerical simulation results of three types of storage tanks with height to diameter ratios of 1.0,0.5 and 0.2,the influence of wind direction Angle and tank spacing on tank group interference effect is studied.The results show that when the wind Angle of the two tanks is 0°,the interference factor of the total pressure on the inner and outer walls of the tanks and the tank walls is 0.6.When the oblique wind Angle of three tanks is 45°,the interference factors of tank inner wall and tank wall total pressure are 0.06 and 0.52,respectively.When the oblique wind Angle is 45°,the interference factors of tank inner wall and total pressure on tank wall are 0.51 and 0.69,respectively,and the interference effect of tank group is the most significant. |
