基于随机骨料模型的碾压混凝土劈拉性能的数值分析  

Numerical Analysis of Split-tension Strength of Concrete Based on the Randoin Aggregate Model

作　　者：王楠[1] 廖建新 屈彦玲[1] 

机构地区：[1]石家庄铁路职业技术学院土木系,石家庄050041 [2]中铁十九局第五工程有限公司,辽宁大连116100

出　　处：《黑龙江水专学报》2008年第3期39-41,共3页Journal of Heilongjiang Hydraulic Engineering College

摘　　要：为从细观结构上研究碾压混凝土的劈裂抗拉力学性能的尺寸效应,采用随机骨料模型模拟碾压混凝土的细观结构,在细观层次上将碾压混凝土看成是由硬化水泥砂浆体、粗骨料颗粒及二者间的黏结带构成的三相非均质复合材料;利用有限元方法数值模拟碾压混凝土的细观损伤断裂和劈裂抗拉,对其劈裂抗拉强度尺寸效应进行了研究。结果表明:黏结层面是碾压混凝土劈拉破坏的薄弱环节,碾压混凝土试件的劈裂抗拉强度存在明显的尺寸效应,所采用的数值模拟计算方法基本可行。For studying the split-tension strength and its size effect of concrete on micro-level, the random aggregate model was used to simulate the structure of concrete, concrete is taken as three-phase composites consisting of mortar smut matrix, aggregate and bond between matrix and aggregate on micro-leveL The extension of cracks and the mechanic properties of concrete in split-tension test were simulated using finite method. The size effect of split-tension strength of concrete was also studied. The result indicates that the contact surface of aggregate and mortar is weak place of split-tension of concrete and the numerical simulation is feasible basicly.

关 键 词：劈裂抗拉强度 碾压混凝土 随机骨料模型 尺寸效应 数值模拟 

分 类 号：TU528.01[建筑科学—建筑技术科学]