The Structure For The Stability Design Of Large Steel Silo Wall

The steel silos are widely used for the storage of bulk solids. The steel silo destruction often occur, usually the failure mode of the silo wall is buckling in vertical pressure. It is shown that the code used to guide the design of steel silo is not perfect. The steel silo wall is a typical cylindrical shell structure which is very sensitive to the boundary conditions, so setting up stiffening rib on the silo wall can improve the stability effectively, but it is the lack of related research.Domestic and international codes were used to check the design of a silo wall, both to meet demand.Numerical analyses including linear eigenvalue buckling analyses, geometrically nonlinear analyses, geometrically and materially nonlinear analyses are carried out to investigate the stability of the silo wall impacted by different stiffening rib.By linear eigenvalue buckling analyses, geometrically and materially nonlinear analyses, the design of a silo wall was checked, to learn about the stress-strain distribution and the buckling mode, then to compare the stability under the radial pressure of filler. It is found that the buckling mode is great relate to the radial displacement of the silo wall.About the silo wall of this design, linear eigenvalue buckling analyses (LEA) were performed to study various parameters of stiffening rib, such as the setting range, the width-thickness ratios, the spacing and the thickness. The results show that the buckling strength of silo wall is mainly dependent on the range of stiffening rib, which also affects the buckling mode. Both of the spacing and thickness of stiffening rib are also a main parameter that affect the buckling strength of silo wall. When the stiffness was to meet, the buckling strength of silo wall is less affected by the width-thickness ratios of stiffening rib.Considering the impact of the large deformation, geometrically nonlinear analyses (GNA) were performed to check the results about linear eigenvalue buckling analyses (LEA). It is found that the results are basically matched, but the buckling strength of silo wall is a slight decrease.Finally, this paper have given some helpful suggestion for the engineering design, such as the range of stiffening rib, the width-thickness ratios and the spacing.