| With the rapid development of the petroleum chemistry industry, the energy crisis intensified in recent years all over the world and the enforcement of our country's strategic petroleum reserve project, it's necessary to build more and more large-scale oil storage tanks. Oil is flammable and explosive substances, and if so many large-scale oil storage tanks are involved in contingency like explosion, it will result in serious casualty and large direct and indirect economic losses. Especially the secondary disaster of explosion will cause worse influence and greater damage to environment.In order to guarantee the safety of such lifeline facilities and adopt appropriate engineering measures to reduce the losses caused by direct and secondary disaster, the analysis of dynamic response and the evaluation of explosion resisting performance of liquid storage tanks must be carried out. In current research on explosion resistance of liquid storage tanks, efforts are primarily focused on the risk analysis and safety evaluation of explosion by means of establishing the mathematic assessment methodology and characteristic model of explosion disaster. Although the method that combines the fluid mechanics with the explosion mechanics has been applied to some extent, there is no system analysis regarding the simulation of large-scale oil storage tank's explosion. Therefore, it's hard to provide effective scientific basis for the protection and explosion-resistant design of large-scale liquid storage tanks in petrochemical industry. Based on the above discussion, numerical simulation and computation and analysis of dynamic response to blast loads of dome roof and floating roof erect cylindrical oil storage tanks are performed by using the General Purpose Finite Element Analysis software ANSYS/LSDYNA combining with the structural characteristic of large-scale oil storage tanks.In this thesis, analysis of the dynamic response of oil storage tanks subjected to blast loads, which considers such factors as fluid-solid interaction between the fluid, water and air for example, and the structure of steel oil storage tanks, material nonlinearity and so on, has been performed. Thus, research work carried out can be summarized as follows:Part 1: The basic theory of numerical analysis of erect liquid storage tanks by utilizing the ANSYS/LSDYNA and the modeling process of such tanks are presented.Part 2: By comparing the results of numerical analysis with that of explosion experiments, the ANSYS/LSDYNA model of liquid storage tank has proven to be reliable.Part 3: Analysis of the dynamic response of a dome roof liquid storage tank with capacity of 5000m~3under blast loads is provided, based on which some conclusions are drawn.Part 4: Analysis of the dynamic response of a floating roof liquid storage tank with capacity of 100000m~3 under blast load is given, from which some conclusions are derived. |
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