钢筋混凝土筒仓散料的静力相互作用分析

Static Interaction Analysis of RC Silo Structure Granular Material

摘要:

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.

关键词:钢筋混凝土筒仓; 亚塑性本构理论; 筒仓散料静力作用; 有限元模拟

Abstract:

Based on the hypoplastic constitutive theory, this paper aimed to analyze the pressure of RC cylinder silo wall exerted by the granular material using the finite element method (FEM). The granular material inside the silo was modeled with the modified von Wolffersdorff’s hypoplastic constitutive model by Niemunis and Herle. In order to simulate the interaction between silo wall and granular material, the contact pair algorithm was used which could model pure master slave surfaces considering the Coulomb’s friction law. Using the ABAQUS finite element numerical model, the static interaction between RC silo wall and the granular material was analyzed，and the numerical results are compared to the codes of RC silos in China, Europe(ISO), USA, the classical theories of pressure exerted by the granular materials and the existing experimental data. Meanwhile, this paper also analyzed material parameters concluding a variety of granular materials, initial void ratio, critical friction angle, friction coefficient, granulate hardness and the granular strain. The analytical results show that the effects of initial void ratio, critical friction angle, granular strain, granulate hardness, and the variety of granular materials are more significant than any other material parameters.

Key words:RC silo; hypoplastic constitutive theory; static interaction of silo structure granular material; finite element method simulation