Structural Analysis Of Large-scale LNG Storage Tank Under Wind Pressure

As a clean energy,natural liquefied gas(LNG)has attracted extensive attention worldwide.In our country,most of the large scale LNG tanks are built in the southeast coastal areas,which are greatly influenced by wind load perennially.The increasingly large-scale development of the LNG storage tanks,make its diameter increases,and diameter-thick ratio is reduced,which will cause the loss of tank's rigidity and stability under wind pressure.Once there are buckling deformation or capsized(blown flat),it will bring irreparable economic losses and casualties.1.Brief introduction of wind engineering and wind load theory,and determine the LNG storage tank's circumferential and vertical wind pressure distribution form combined with domestic and foreign literature.Briefly discussed the static wind induced buckling analysis theory,including the research status,methods and significance.Introduction of theoretical basis of software to simulate fluctuating wind load.2.The passage is set in practical engineering,building a three-dimensional finite element model of LNG tanks with the application of ADNIA.We get tank wall's stress distribution and deformation situation and the tank wall's buckling mode and the ultimate buckling load.And the static analysis results did not exceed the critical load.Under 11 ~ 14 level wind,the maximum equivalent stress does not exceed critical load;when at level 15 to 17 it is easily destabilize so that wind-resistance measure is needed.Put forward a wind resistance design scheme.3.Get the first three mode and natural frequency through modal analys.CAWS(Constant Amplitude Wave Superposition)method is adopted to simulate the fluctuating wind series to make the wind vibration response analysis.Under fluctuating wind pressure,the deformation of the model is similar with that of equivalent static wind load,maximum load and maximum displacement are much more smaller.It shows that the static method is conservative.The greater the wind pressure,the larger the deviation the static method is.