A modified rigid-body-spring concrete model for prediction of initial defects and aggregates distribution effect on behavior of concrete

被引:27
作者
Gu, Xianglin [1 ]
Hong, Li [1 ]
Wang, Zhuolin [1 ]
Lin, Feng [1 ]
机构
[1] Tongji Univ, Dept Bldg Engn, Shanghai 200092, Peoples R China
基金
中国国家自然科学基金;
关键词
Initial defect; Aggregate distribution; Mechanical property; Concrete; Modified rigid-body-spring model; Statistical analysis; STRENGTH; TENSION;
D O I
10.1016/j.commatsci.2013.04.050
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A modified rigid-body-spring concrete model was developed by considering the contact between elements after the failure of the springs. The discretization and definition of elements and springs were based on the three phases of concrete, including the coarse aggregates, the mortar and their interface. Based on the modified rigid-body-spring model, stress-strain curves and failure modes of concrete specimens with preset holes under uniaxial loads were simulated firstly, the simulated results were validated by those obtained from tests; and then, the effect of initial defects and distribution of coarse aggregates on mechanical behavior of concrete were investigated. It was found that with the increase of initial defects amount, the strength, elastic modulus and Poisson's ratio of concrete decreased nonlinearly; and, the statistical analysis revealed that variability of the mechanical properties of concrete was mainly affected by the random distribution of coarse aggregates. (c) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:355 / 365
页数:11
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