基于FEM的足尺落地式浅圆钢筒仓静态贮料作用分析

FEM analysis of static action exerted by stored materials in a full scale squat cylindrical steel silo with flat bottom

准确计算贮料对仓壁的作用,是大直径浅圆钢筒仓安全设计的前提.为此,采用有限单元法(FEM)对足尺落地式浅圆钢筒仓的静态贮料作用进行了数值模拟分析,包括小麦、铁矿石散粒、石英砂和水泥散料,其本构关系服从Drucker-Prager屈服非关联流动准则.采用3-D模型同时模拟了贮料和筒仓,建立考虑变形的面-面接触对,以更好地反映贮料对仓壁的静态作用.将FEM模拟值与国内外筒仓规范的计算结果进行了对比分析,并讨论了贮料力学参数的影响,表明FEM可作为一种准确、可靠的钢筒仓静态贮料作用计算工具.

Silos design is based on accurated evaluating static action exerted by stored materials.In order to analyse the interaction between silo and stored materials in full scale squat circular steel silo with flat bottom,the finite element method（FEM） was chosen.Four kinds of stored materials are analyzed,including wheat,iron ore pellets,sand and cement.The stored materials and silo were simulated simultaneously in three-dimensional model,assigned to the Drucker-Prager criterion of plasticity of the stored materials.For evaluating the static action reasonably,the contact pairs named surface-to-surface are selected.The results obtained from FEM were compared with ones from silo codes at home and abroad,meanwhile the influences of different parameters were also discussed.It was certified that FEM is an appropriate tool for evaluating the static action exerted by stored materials in squat circular steel silos.