| Since the 21 st century,oil has gradually become an important and indispensable resource for all countries,and oil is also one of the three major energy sources in the world.Countries are paying more and more attention to oil resources as the blood of industry,and a country’s strategic oil reserve capacity has become one of the important indicators for evaluating comprehensive national power.China began to carry out strategic oil reserves as early as the1990 s,and has established several oil reserve depots.With the development of science and technology,the total scale of China’s oil reserves will reach about 100 days of net oil imports,and also reach the strategic oil reserve capacity attainment line set by the International Energy Agency.However,there are also some problems,such as the corrosion of oil storage tanks,serious corrosion will develop into perforation,causing secondary disasters such as fire,while the impact of earthquakes on the mechanical properties of oil storage tanks can not be ignored.This paper uses the large finite element software ABAQUS and the introduction of additional mass method of vertical steel tanks with group corrosion modal vibration analysis,to explore the effect of corrosion on the tank load bearing capacity under the action of static forces,selected different seismic waves applied to the tank containing group corrosion defects to simulate the real case of earthquake response analysis of tanks containing group corrosion defects,to provide reference for the design and protection of tanks in actual engineering.Specific research content is as follows:1.Firstly,the modal analysis of the storage tank is carried out,and the additional mass method is introduced to realize the effect of liquid-solid coupling through the subroutine programming,so as to complete the modal analysis of the steel storage tank without corrosion defects under different liquid storage ratios.The results obtained by the additional mass method were compared with the specifications to verify the correctness of the model.The group corrosion defects were applied to the tank wall for modal analysis,and the mode shape and period of the tank wall under two different working conditions were studied in depth.2.Considering the large size of the actual engineering tank,the finite element software is used in this paper to establish a scaled floating roof tank model,in which the tank size is 1000m3.The stress state and radial displacement of each part of the non-corrosive tank under static water pressure are verified according to the specification.Different corrosion conditions are determined by analyzing different corrosion sites of storage tanks.Based on the static analysis of the tank,the bearing capacity of the tank under different corrosion conditions was studied,the influence of different corrosion parameters on the allowable stress of the tank wall was found out,and the critical value of tank failure was extracted.3.The use of coupled Euler-Lagrange(CEL)technology to simulate the tank reservoir,the use of time analysis method for different conditions of the tank containing group corrosion defects applied to different seismic waves for seismic response analysis,observe the stress law at the corrosion and the effect of the seismic action of the tank containing group corrosion defects on the dynamic response of the tank,to provide a reference basis for the design and maintenance of the tank. |
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