混凝土随机损伤本构关系的数值模拟研究  

Numerical Simulation of Concrete Stochastic Damage Constitutive Law

作　　者：孙超[1] 邬翔[1] 周勇[1] 李杰[1] 

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《华中科技大学学报（城市科学版）》2008年第4期276-279,共4页Journal of Huazhong University of Science and Technology

基　　金：国家自然科学基金委创新研究群体科学基金(50621062);国家自然科学基金重大研究计划重点资助项目(90715033)

摘　　要：从细观力学层次出发,把混凝土看作是由骨料、砂浆基质及两者之间的界面过渡区组成的三相复合材料,通过引入细观损伤变量及损伤变量的演化规律模拟了混凝土的破坏过程。首先生成骨料位置随机分布且颗粒级配符合Fuller曲线的数值试件,然后对每一相材料分别赋以服从Weibull分布的随机力学参数(弹模、强度和泊松比等)并规定相应的破坏准则,将通过上述途径获得的混凝土数值试件导入有限元软件Abaqus进行数值模拟。与实验结果的对比显示,本文提出的随机损伤数值模型能够较好地模拟混凝土板式试件在单拉、单压下的应力-应变关系曲线以及混凝土中裂纹的萌生、开裂过程。Concrete, in mesoscopic level, can be assumed to consist of aggregate, cement matrix and their interfacial transition zone. Based on this assumption, this paper numerically investigates the mechanical behavior of concrete. Firstly numerical specimens, in which the aggregates are randomly distributed as well as the grain composition complies with Fuller Curve, are obtained. Secondly, a set of mechanical parameters obeying Weibull distribution together with the damage criteria, such as strength, elastic modulus, Poisson＇s ratio etc., are assigned to the elements of different phases respectively. Thirdly, numerical specimens subjected to uni-axial tension/compression are simulated via computer. Comparing the simulation results with experiment data, one can find that the proposed model can rationally predict the mechanical behavior of concrete.

关 键 词：细观力学 数值试件 随机损伤 本构关系 

分 类 号：TU528.01[建筑科学—建筑技术科学]