The seismic response of fluid-structure interaction to the outer tank of LNG storage tank is studied.The vibration of LNG storage tanks with different liquid heights under different seismic waves is analyzed by shaking table test and numerical simulation.Experimental results show that the earthquake will change the distribution of acceleration and displacement of the tank,and different seismic waves and different liquid heights have different effects on the amplification effect of displacement and acceleration.Under the action of El Centro wave,Taft wave and SHM2 wave,the damping effect caused by fluid oscillation and the additional inertia effect caused by fluid pressure can reduce the displacement in the middle of the tank,but amplify the acceleration.Seismic simulation analysis of displacement and circumferential stress of 5000m3 LNG storage tank is carried out by using time-history analysis method.The results show that the circumferential stress of the storage tank presents a trend of large in the middle and small at both ends,and extreme values appear at 1/4,1/2 and 3/4 of the tank height.The displacement first increases and then decreases along the tank height direction,and the peak values appear at 1/4,1/3,1/2 and 3/4 of the tank height.The influence of fluid-solid coupling effect on the structure should be considered in the seismic design of LNG storage tanks.In the weak positions of the tank height of 1/4,1/3,1/2 and 3/4,measures such as increasing wall thickness,setting the damper and reinforcing steel bars should be taken to enhance the reliability and safety of the structure.
关键词
LNG储罐/流固耦合/振动台试验/数值模拟分析/地震响应
Key words
LNG storage tank/fluid structure interaction/shaking table test/finite element analysis/seismic response
维普
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