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首页> 外文期刊>Granular matter >A discrete element implementation for concrete: particle generation, contact calculations, packing under gravity and modeling material response
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A discrete element implementation for concrete: particle generation, contact calculations, packing under gravity and modeling material response

机译：用于混凝土的离散元素实现：粒子生成，接触计算，重力作用下的堆积以及对材料响应进行建模

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摘要

A three-dimensional discrete element modelling capability for concrete based on rigid particles of arbitrary shape and size has been developed. The novel particle generation algorithm allows control of particle size, angularity and flakiness. General rigid body kinematics including finite rotations is accounted for, and an explicit time integration algorithm that conserves energy and momentum is implemented. An efficient contact algorithm with several features to increase the efficiency of the contact computations has been developed. This enables the gravity packing problem for arbitrary shaped particles to be solved in reasonable run time. The proposed procedure is used to generate assemblies of concrete specimens of various sizes that are homogeneous and isotropic in the bulk, and can capture the wall effect due to the formwork. The calibrated specimens are seen to be capable of accurately capturing experimentally observed macro stress strain response and failure patterns. The influence of aggregate shape on texture formation in the packed specimen, and on macro strength and failure patterns in hardened concrete, is demonstrated and is seen to be consistent with experimental results.
机译：已经开发了基于任意形状和大小的刚性颗粒的混凝土三维离散元建模功能。新颖的粒子生成算法允许控制粒子大小，角度和片状度。考虑了包括有限旋转在内的一般刚体运动学，并实现了一种节省能量和动量的显式时间积分算法。已经开发了一种具有多种功能的有效接触算法，可以提高接触计算的效率。这使得能够在合理的运行时间内解决任意形状颗粒的重力堆积问题。所提出的程序用于生成各种尺寸的混凝土试样的组件，这些试样在整体上是均匀且各向同性的，并且可以捕获由于模板引起的墙效应。可以看到，经过校准的标本能够准确捕获实验观察到的宏观应力应变响应和破坏模式。骨料形状对填充试样中纹理形成的影响以及对硬化混凝土中宏观强度和破坏模式的影响已得到证实，并且与实验结果一致。

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