摘要
在提出一种交叠骨料微步长迭代自动调整算法的基础上,采用任意凹凸型骨料配置算法建立混凝土细观数值试件。基于细观单元的弹性损伤本构关系,采用位移控制模式,着重针对两类常用的力学参数随机分布——Weibull及对数正态分布,进行了不同力学参数的常规混凝土拉压数值模型破坏试验,分析了主要力学参数的随机分布对混凝土试件宏观表征力学性质的影响。该研究可为混凝土细观数值模型中力学参数的合理确定提供依据。
According to the objective grading curve and filling area fraction of aggregates, numerical concrete specimen was firstly built on the basis of the advanced numerical generation method of aggregates with random shapes. And then, mesoscopic numerical simulation tests were carried out to study the damage evolution and to compare the influences of mechanical parameter distribution patterns (Weibull and lognormal distribution) on the mesoscopic strength of concrete specimen. Numerical result shows that Weibull distribution pattern is more active to reflect the discrete mechanical properties of concrete.
出处
《建筑科学与工程学报》
CAS
2007年第3期7-12,共6页
Journal of Architecture and Civil Engineering
基金
国家自然科学基金项目(90510018)
国家自然科学基金项目(50679006)
大连理工大学青年教师培养基金项目(893221)
关键词
混凝土
随机骨料模型
细观数值模拟
损伤与破坏
单轴拉伸
单轴压缩
concrete
random aggregate model
mesoscoplc numerical simulation
damage and fracture
uniaxial tension
uniaxial compression