在细观层次上,混凝土被认为是一种由粗骨料、水泥砂浆及二者间的粘结带所组成三相非均质复合材料。本文首先基于蒙特卡罗随机抽样原理,用“取和放”方法在计算机上产生形状、尺寸和骨料颗粒分布与真实混凝土相似的随机骨料结构,再使用...在细观层次上,混凝土被认为是一种由粗骨料、水泥砂浆及二者间的粘结带所组成三相非均质复合材料。本文首先基于蒙特卡罗随机抽样原理,用“取和放”方法在计算机上产生形状、尺寸和骨料颗粒分布与真实混凝土相似的随机骨料结构,再使用有限元分析软件AN SY S对骨料区域及砂浆区域分别划分网格,并编程在骨料和砂浆之间生成三角形三结点可控制厚度粘结单元,从而使三相网格缝合为一个整体,为混凝土非线性有限元分析提供可靠的细观计算模型。最后利用建立的模型进行混凝土轴心受拉和轴心受压的仿真模拟,在细观层次研究的基础上揭示出混凝土的宏观力学性能。展开更多
Concrete is a kind of widely used structural and engineering material,and its compositions are very complex.Therefore,its physical and mechanical performances are also complicated and uncertain.The macro-level analysi...Concrete is a kind of widely used structural and engineering material,and its compositions are very complex.Therefore,its physical and mechanical performances are also complicated and uncertain.The macro-level analysis,leaving out the complicated meso-level structure of concrete,can hardly be used to describe the deformations and cracking and set up the precise originally structural model.From the microscopic degree,microscopic mechanics sets up the relationship between the meso-level cracks/damages and macro-level mechanical performances and better reveals the effects that several factors have on the mechanical performances of concrete.In this paper,some study methods of mechanical performances of concrete based on micro-mechanics are introduced,and different models of numerical simulation of concrete on micro-level summarized and the advantages and disadvantages of lattice model,random particle model and random aggregate model,etc,are told.The problems still existing in this field are pointed out.展开更多
文摘在细观层次上,混凝土被认为是一种由粗骨料、水泥砂浆及二者间的粘结带所组成三相非均质复合材料。本文首先基于蒙特卡罗随机抽样原理,用“取和放”方法在计算机上产生形状、尺寸和骨料颗粒分布与真实混凝土相似的随机骨料结构,再使用有限元分析软件AN SY S对骨料区域及砂浆区域分别划分网格,并编程在骨料和砂浆之间生成三角形三结点可控制厚度粘结单元,从而使三相网格缝合为一个整体,为混凝土非线性有限元分析提供可靠的细观计算模型。最后利用建立的模型进行混凝土轴心受拉和轴心受压的仿真模拟,在细观层次研究的基础上揭示出混凝土的宏观力学性能。
文摘Concrete is a kind of widely used structural and engineering material,and its compositions are very complex.Therefore,its physical and mechanical performances are also complicated and uncertain.The macro-level analysis,leaving out the complicated meso-level structure of concrete,can hardly be used to describe the deformations and cracking and set up the precise originally structural model.From the microscopic degree,microscopic mechanics sets up the relationship between the meso-level cracks/damages and macro-level mechanical performances and better reveals the effects that several factors have on the mechanical performances of concrete.In this paper,some study methods of mechanical performances of concrete based on micro-mechanics are introduced,and different models of numerical simulation of concrete on micro-level summarized and the advantages and disadvantages of lattice model,random particle model and random aggregate model,etc,are told.The problems still existing in this field are pointed out.
