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大型钢制储罐是一种地基沉降十分敏感的特种结构,尤以沿罐周的不均匀沉降即基础局部沉陷对罐体的影响最为关键。本文采用有限元方法,研究分析了大型钢制储罐沿罐周相邻点不均匀沉降达到临界值的情况下,钢储罐的变形形态以及其应力分布特征。结果表明,在基础局部沉陷情况下,储罐的变形形态表现为褶皱式扭曲凹凸,具谐波状特征;罐壁内最大Mises应力点对浮顶罐主要发生在罐壁的中下部,对拱顶罐主要发生在罐壁底部。结果同时也表明,基础局部沉陷对浮顶罐的危害影响主要为浮盘的升降困难,对拱顶罐为罐底部局部应力的加剧。
Large-scale steel storage tank is a kind of special structure which is very sensitive to foundation settlement. Especially the uneven settlement along the tank circumference, which is the basic subsidence, has the most important impact on the tank. In this paper, the finite element method is used to study the deformation of steel tanks and their stress distribution under the circumstance that the non-uniform settlement of adjacent large-sized steel tanks reaches the critical value. The results show that under the condition of basic subsidence, the deformation morphology of the storage tank is folds twisted and convex with the characteristics of harmonic wave. The maximum Mises stress point in the tank wall mainly occurs in the middle and lower part of the tank wall, The top tank occurs mainly at the bottom of the tank wall. The results also show that the damage caused by the foundation partial subsidence to the floating roof tank is mainly caused by the difficulty of raising and lowering of the floating roof and the local stress on the bottom of the tank is aggravated by the local subsidence.