【摘要】 介绍了离散单元法用于混凝土细观结构数值模拟的优越性及其基本原理;总结了目前基于离散单元法的刚体-弹簧元模型、扩展的离散单元法、颗粒-界面元模型、梁-颗粒模型等常用模型的原理、研究现状、成果,以及各自的优缺点;对数值模型建立中应考虑的关键问题,如破坏准则、本构关系以及材料参数的确定方法等作了归纳分析。指出目前离散单元法用于混凝土数值模拟的研究主要以二维模型、简单受力状态、定性分析为主,而在复杂受力状态、定量分析、随机性分析以及相应实用软件的开发等方面仍有待进一步研究。更多还原

【Abstract】 The advantages and principles of meso-mechanical models of concrete based on the discrete element method are introduced.Various models widely used at present,such as Rigid Body-Spring Model,Extended Distinct Element Method,Particle-Interface Element Model,and Beam-Particle Model,are analyzed.The study state,as well as advantages and disadvantages of each method,are summarized.Some problems needed to be noted when the model is built,such as failure criteria,constitutive relationship,and material parameters,are also analyzed.Finally,it is figured out that current studies on numerical simulation of concrete based on the discrete element method mainly focus on planar model,simple load state,and qualitative analysis,more efforts on complex load state,quantitative analysis,stochastic analysis and development of corresponding software are needed in the future.更多还原