支柱沉降作用下球形储罐的屈曲研究

Buckling study of spherical storage tanks under the uneven settlement of pillars

选取一台5000 m^(3)的在役丙烷球罐为研究对象,球罐的充装率为90%。分别建立了单根沉降、蝶形沉降和两根沉降3种情形下的屈曲有限元模型,在ANSYS Workbench平台进行了屈曲响应分析,得到了沉降的极限值,掌握了球罐在支柱沉降下的屈曲变形规律。研究表明:单根支柱沉降的极限值最大,蝶形沉降的极限值最小,球罐在蝶形沉降下更容易屈曲;球罐在单根沉降时屈曲变形最小,在蝶形沉降时屈曲变形最大,球罐在蝶形沉降下屈曲变形更严重;在球罐屈曲分析的前期阶段主要是小幅度的弹性变形,而当沉降量超过极限值后,球罐将产生较大幅的屈曲变形,且屈曲变形最大的位置在拉杆处;球罐在3种不均匀沉降下的屈曲响应均符合典型的分支屈曲的特点。

In this study,a 5000 m^(3) in-service propane spherical tank is selected as the research object,and the filling rate of the spherical tank is 90%.The finite element models of buckling under three conditions of single-pillar settlement,butterfly-shaped settlement and two-pillar settlement are established respectively.Numerical simulation of buckling analysis is carried out on ANSYS Workbench platform,and the limit value of settlement and the buckling deformation law under the settlement of spherical tank are obtained.It is found that the limit value of the single-pillar settlement is the largest,and the limit value of the butterfly-shaped settlement is the smallest,and the spherical tank is easier to buckle under the butterfly-shaped settlement.The buckling deformation of the single-pillar settlement is the smallest,and the buckling deformation of the butterfly-shaped settlement is the largest.The buckling deformation of the spherical tank is more serious under the butterfly settlement.In the early stage of the buckling analysis of the spherical tank,there is mainly a small amount of elastic deformation,and when the settlement exceeds the limit value,the spherical tank will undergo a relatively large buckling deformation,and the position of the largest buckling deformation is at the tie rod.The buckling response of the spherical tank under the three kinds of uneven settlement all accords with the characteristic of typical bifurcation buckling.