大型焊接储煤钢板仓的结构设计和稳定性分析

STRUCTURE DESIGN AND STABILITY ANALYSIS OF A LARGE WELDED STEEL SILO FOR COAL STORAGE

钢板筒仓具有混凝土筒仓无法比拟的优势,其应用已越来越广泛,但其理论研究还相对滞后,尤其对于储煤用大型钢板筒仓的设计尚没有明确的标准指导。结合一拟建储煤钢板筒仓,根据其现场生产条件和工艺要求分析钢板筒仓的结构选型和布置方案;利用Midas/Gen有限元软件建立仓体和仓顶组装成的整体模型,并对其进行结构静力性能的分析,揭示结构在不同受力状态下的应力分布特征和变形特征,验证结构布置的合理性和安全性。利用有限元分析软件ANSYS对仓体分别进行空仓状态和实仓状态下的特征值屈曲分析,发现实仓状态下的第一阶屈曲特征值较空仓状态减小了86.85%;研究水平环向压力对仓体临界承载力的影响,发现实仓在水平环向压力作用下第一阶屈曲特征值提高了89.15%;最后对仓体进行了考虑材料和几何双重非线性的稳定分析,得到结构的实际极限承载能力,发现钢板筒仓是一种非线性非常明显的结构。

As the steel silo has incomparable advantages over the concrete silo, it is widely used in many fields, however, its theoretical research is relatively lagging behind, and especially there is no any clear specification to guide the design of a larger steel silo for coal storage.Based on the site operating conditions and technological requirements, the structure arrangement and the structure’ s form of a proposed steel silo for coal storage were analyzed.The entire model assembled with the silo body and the roof was built up with FEA software Midas/Gen, and its static performance was analyzed, the features of the stress distribution and deformation distribution under different loads were got, and the rationality of the structure arrangement and its security were also verified. Eigenvalue buckling analysis on both empty silo and full silo were carried out with FEA software ANSYS, showing that the first order buckling eigenvalue of the full silo was decreased by 86.85%.The influence of the ring pressure, produced by the coal, on improving the ultimate bearing capacity was also studied, and it was found that the first order buckling eigenvalue was increased by 89.15% when considering the ring pressure.Finally a non-linear analysis was carried out, based on both the material nonlinearity and the geometry nonlinearity, obtaining the actual ultimate bearing capacity of the silo structure, finding that the steel plate silo is a kind of nonlinear structure.