基础沉降发展对球罐结构影响的分析研究

Analysis and Research on the Influence of Foundation Settlement Development on Spherical Tank Structure

球罐是石化行业中主要的存储设备之一。大型球罐多采用独立基础,各支柱建造和安装时很难保证基础在同一水平面上,并且基础沉降会随着时间的延续而不断发展,不均匀沉降也会造成上部结构受力不均匀,影响球罐结构安全。采用有限元方法,运用ANSYS软件建立球罐模型,考虑基础在一个方向从单点沉降逐渐过渡到整体倾斜,在最不利工况条件下对球罐各部分结构的应力分布及变化进行计算与分析研究。分析结果表明,最大应力出现在与托板连接的球壳上;相邻基础沉降差控制在2 mm的情况下,结构最大应力变化并不明显,基础沉降会使结构内力重新分布。

Spherical tank is one of the main storage equipment in petrochemical industry.Independent foundations are mostly used in large spherical tank.It is difficult to ensure that the foundations are on the same level during construction and installation of the pillars and the settlement of the foundation will continue to develop over time.Uneven settlement will also cause uneven stress on the upper structure,which will affect the structure safety of the spherical tank.The finite element method was used to establish the spherical tank model by ANSYS,considering the foundation’s gradual transition from a single point subsidence to whole incline,structural calculation and analysis were carried out under the worst condition to study the stress distribution and changes of each part of the spherical tank.The results show that the maximum stress position is spherical shell connected with the support plates.When the settlement difference between adjacent foundations is controlled at 2 mm,the maximum stress change of the structure is not obvious,and the settlement of the foundation will redistribute the structural internal forces.