含缺陷混凝土的弹性模量预测_姚婷.pdfVIP

30 6 2010 12 Vol. 30 No. 6 Advances in Science and Technology of Water Resour ces Dec. 2010 DOI 10. 3880/ j . issn . 2010 . 06. 009 含缺陷混凝土的弹性模量预测 1 2 2 姚 婷, 杜成斌 , 孙立国 ( 1. , 210008; 2. , 210098) 提出一种新的预测含缺陷混凝土弹性模量的估算方法将混凝土看作是由砂浆骨料 面 和缺陷( 包括圆形孔隙和币状裂隙) 等组成的四相复合材料, 建立随机骨料数值模型, 运用细观力学 数值均匀化方法预测混凝土的有效弹性模量, 并与无缺陷情况下的计算结果以及试验结果进行对 比, 在此基础上进行各影响参数的敏感性分析结果表明, 缺陷的存在会减小混凝土的有效弹性模 量; 混凝土的有效弹性模量随着骨料或砂浆弹性模量的增大而增大; 面特性参数和骨料最大粒径 对混凝土有效弹性模量的影响有限; 任意多边形骨料模型比圆形骨料模型对混凝土有效弹性模量 的预测更接近试验值 混凝土; 缺陷; 弹性模量; 随机骨料模型; 材料细观力学性能 TB 12 A 2010) 1 2 2 Predication of elastic modulus of concrete with defects/ / YAO Ting , DU Cheng- bin , SUN L-i guo ( 1. Jiangsu Bote New Materials Co . , Ltd . , N anj ing 210008, China ; 2. College of Mechanics and Materials , H ohai University , N anj ing 2 10098, China Abstract A new method to predict the elastic modulus of concrete w ith defect s was proposed . The concrete was regarded as the f ou-r ph ase composite composed of aggregate, mortar, interfaces and def ects ( including circular holes and penny cracks) . A mathematical model for random aggregate w as established. The effective elastic modulu s of the concrete w as predicted by use of the m icrom echanical numerical homogenization m ethod , and the num erical results w ere compared w ith the calculated and test results f or the cases w ithout def ects . On su ch a basis, the sensitivity of each param eter w as analyzed. The