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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。
Using finite element analysis software, the meso-mechanics model of EPS concrete based on random distribution was established. The compressive damage process of EPS concrete is numerically simulated, and the influence of EPS particle area occupancy, arrangement and shape on the mechanical properties of EPS concrete is analyzed. The results show that the failure of EPS concrete shows obvious brittle failure when the share of EPS particle area is small, and the destruction of EPS concrete gradually changes from brittle failure to ductile failure as the area occupancy rate increases. When the content of EPS particles is low, Distribution and stochastic distribution have little effect on the stress-strain relationship of concrete. With the increase of EPS particle area, the regular distribution has more residual stress than stochastic distribution. Under the same area occupancy, the stochastic distribution has a smaller brittleness index , And the regular distribution shows better ductility. When the shape of EPS particles is triangular, the maximum stress of EPS concrete is the best, while the minimum stress of the square is the worst. When the shapes are round and pentagonal, the stress-strain relationship and brittleness The index is close.