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基于亚塑性本构理论,对钢筋混凝土筒仓仓壁与散料颗粒体之间的静态压力作用进行有限元模拟.筒仓内散料颗粒采用Niemunis和Herle基于von Wolffersdorff修正的亚塑性本构模型;仓内散料颗粒与仓壁之间的相互作用采用基于库伦摩擦定律的面面接触关系.利用ABAQUS软件所建立的有限元模型,对筒仓-散料静力相互作用进行数值模拟,并将数值模拟结果与我国、欧洲(ISO)、美国筒仓设计规范,以及筒仓经典压力理论及既有试验数据进行比较.同时,还对仓内散料颗粒材料种类、初始孔隙比、内摩擦角、摩擦系数、颗粒硬度和颗粒间应变进行参数分析,分析结果表明,散料颗粒的种类、初始孔隙比、仓内散料临界内摩擦角、颗粒硬度和颗粒间应变对筒仓-散料静力相互作用影响较大.
Based on the sub-plastic constitutive theory, the finite element method (FEM) was used to simulate the static pressure between the silo wall and the bulk material of the reinforced concrete silo. Bulk material particles in the silo were simulated by Niemunis and Herle based on von Wolffersdorff’s modified sub-plastic constitutive model The interaction between bulk particles and silo wall in warehouse is based on Coulomb friction law and the finite element model established by ABAQUS is used to simulate the silo-bulk static interaction. The results of numerical simulation are compared with those of the design standards of silos in China, Europe (ISO), the classic silo pressure theory and the existing experimental data. Meanwhile, the types of bulk material, initial void ratio, internal friction Angle, coefficient of friction, particle hardness and intergranular strain were analyzed. The results showed that the type of bulk material, the initial void ratio, the critical internal friction angle of bulk material, the hardness of particle and the intergranular strain had no effect on the silo-bulk material Static interaction has a greater impact.