基于随机骨料模型的EPS混凝土细观力学特性分析

发布时间：2018-05-02 01:22

本文选题：EPS混凝土 + 随机骨料　；参考：《应用力学学报》2017年04期

【摘要】：利用有限元分析软件,建立基于随机分布的EPS混凝土细观力学模型。对EPS混凝土的受压损伤破坏过程进行数值模拟,分析EPS颗粒面积占有率、排列方式、形状对EPS混凝土力学性能的影响。结果表明:当EPS颗粒面积占有率较小时,EPS混凝土的破坏表现出明显的脆性破坏,随面积占有率的增加,EPS混凝土破坏逐渐由脆性破坏转化为延性破坏;EPS颗粒含量较低时,规则分布与随机分布对混凝土应力-应变关系影响较小;随着EPS颗粒面积占有率的增加,规则分布较随机分布具有更大残余应力;相同面积占有率下,规则分布较随机分布脆性指数更小,规则分布表现出更好的延性;当EPS颗粒形状为三角形时,EPS混凝土应力最大延性最好,正方形时应力最小延性最差,形状为圆形和五角形时,EPS混凝土应力-应变关系与脆性指数相接近。
[Abstract]:The meso-mechanical model of EPS concrete based on random distribution is established by using finite element analysis software. The damage and failure process of EPS concrete under compression is simulated numerically, and the influence of EPS particle area occupancy, arrangement mode and shape on the mechanical properties of EPS concrete is analyzed. The results show that when the area occupied by EPS particles is small, the failure of EPS concrete shows obvious brittle failure, and with the increase of the area occupation rate, the failure of EPS concrete gradually changes from brittle failure to ductile failure and the content of EPS particles is lower. The regular distribution and random distribution have little influence on the stress-strain relationship of concrete, and with the increase of EPS particle area occupation, the regular distribution has more residual stress than the random distribution. The regular distribution is smaller than the random distribution brittle index, the regular distribution shows better ductility, when the shape of the EPS particles is triangle, the maximum ductility of concrete stress is the best, and the minimum ductility of the square is the worst. The stress-strain relationship of EPS concrete with circular and pentagonal shapes is close to the brittleness exponent.
【作者单位】：安徽建筑大学土木工程学院;
【基金】：国家自然科学基金(51478002;51674005) 安徽省教育厅高校自然科学研究重点项目(KJ2017A486)
【分类号】：TU528

【参考文献】