| 程伟峰.混凝土三维随机凸型骨料模型生成方法研究[J].水利学报,2011,42(5): |
| 混凝土三维随机凸型骨料模型生成方法研究 |
| Study on 3-D random packing of convex polyhedron aggregates for concrete |
| |
| DOI： |
| 中文关键词: 混凝土 随机凸多面体骨料模型 数值模拟 射线延拓法 约束非线性最优化方法 |
| 英文关键词: concrete random convex polyhedral aggregate model simulation extension with ray method constrained nonlinear optimal method |
| 基金项目: |
|
| 摘要点击次数: 2798 |
| 全文下载次数: 1063 |
| 中文摘要: |
| 为了较好地模拟混凝土的细观结构，开展了混凝土三维细观随机骨料模型的算法研究，比较分析了骨料生长、相交的算法特点。以随机球形骨料模型为基础，以体积为标度，在前人的基础上，提出了一种新的混凝土三维凸型骨料的生长方式——射线延拓法和一种新的骨料相交判断方法——有约束非线性最优化方法，避免了骨料传统相交判断算法中的多重循环。采用分割-填充法，改善了骨料随机投放过程中的效率问题，使得建模更快捷、有效。 |
| 英文摘要: |
| An accurate representation of meso-scale concrete is a basic requirement for simulating concrete
microstructure. In this paper，the algorithm of 3-D numerical model for micro-scale concrete was studied.Various criteria in the algorithms of aggregate growth patterns and overlaps were analyzed respectively for improving a convex polyhedron aggregate to pack. Based on the criteria established by predecessors，an approach for aggregate growth patterns，namely extension with ray method and a mode for aggregate intersections，namely constrained nonlinear optimal method were introduced from other fields，which can avoid the multi-critical processes in calculation. The efficient of the algorithm is improved by using the Grid-fill method. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |