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本文用最小势能原理对贮液罐的静力轴对称提离机理作了近似分析.结果表明,必须考虑底板大变形,罐壁按大变形和按小变形计算的结果差别不大.美国API设计标准采用带有两个塑性铰的一维小变形板条模型进行提离分析,而本文结果表明当弯曲应力达到一定限度后,底板径向弯矩随提离力增大而减小,在工程实际提离的范围内塑性铰难以出现.罐底和基础之间的相对滑动对薄膜内力有较大影响,但对弯曲内力影响不大.过去实验中观察到的一些现象,可以通过这一分析得到定性解释.虽然本文进行的是轴对称提离分析,但提离量和提离深度都已超过非对称提离研究中观察到的数值,而底板受力仍在弹性范围之内,因此可以期望这一方法也可用来分析贮液罐的非对称提离机理.
In this paper, the principle of minimum potential energy is used to approximate the static axis lift-off mechanism of the liquid storage tank. The results show that large deformation of the bottom plate must be considered. The results of the large deformation and small deformation of the tank wall are not significantly different. The United States API design The standard adopts a one-dimensional small deformation lath model with two plastic hinges for lift-off analysis. The results in this paper show that when the bending stress reaches a certain limit, the radial bending moment of the bottom plate decreases with increasing lifting force, and the The plastic hinge is difficult to appear in the actual lift range. The relative sliding between the bottom of the tank and the foundation has a great influence on the internal force of the film, but has little effect on the bending internal force. Some phenomena observed in past experiments can be analyzed through this analysis. Qualitative explanations have been obtained. Although the analysis of axisymmetric liftoff was carried out in this paper, the liftoff and liftoff depths have exceeded the values observed in the asymmetric liftoff studies, and the stress on the soleplate is still within the elastic range, so It is expected that this method can also be used to analyze the asymmetric lifting mechanism of the storage tank.