A new vessel,the prestressed concrete (PRC) oil tank,for the strategic petroleum reserve(SPR) was represented. With the application of structure analysis software ANSYS, the distribution of the temperature and stress in the side wall of the oil tank was given,in which the stress is caused by the temperature,and the temperature and temperature stress changes with the time,and the maximum temperature stress happens at the top of the side wall at the early time of the oil storage. When filling the heat insulation layer in the side wall of the oil tank,the loop stress in the inner side wall reduces,and the stress in the outer wall increases. So in the design practice the joint of the inner and outer wall should be designed specially to satisfy the displacement caused by the temperature.
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