Research on the crack propagation processes of concrete based on energy consumption equivalence between stochastic damage and fracture

被引：0
作者：
Qing L. [1 ,2 ]
Hao B. [1 ]
Zhao X. [1 ]
Guan J. [3 ]
机构：
[1] College of Civil Engineering, Hebei University of Technology, Tianjin
[2] State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing
[3] School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou
来源：
Shuili Xuebao/Journal of Hydraulic Engineering | 2016年 / 47卷 / 01期
关键词：
Cohesive law; Crack; Dam concrete; Fracture; Stochastic damage model;
D O I：
10.13243/j.cnki.slxb.20150335
中图分类号：
学科分类号：
摘要：
Based on energy consumption equivalence between damage and fracture, a micro-spring stochastic damage model was established with the assumption that the micro-spring failure strain is lognormal distribution and further the method of constructing the cohesive law of concrete was studied. The specific expressions of the cohesive laws of dam concrete (dmax is 80 mm) and sieved concrete (dmax is 40 mm) were obtained respectively by this method. Then the obtained cohesive laws were used to simulate the crack propagation process of three-point bending notched beams of dam concrete and sieved concrete respectively. Then the P-CMOD curves obtained from calculation were compared with the available experiment data, indicating a good agreement, which show the rationality and the effectiveness of the model and the calculation method presented in this paper. The characteristic lengths of the dam-concrete and wet-screening concrete were studied using this model and calculation method. The results show that, for the concrete investigated in this paper, the characteristic lengths are advised to be 6 to 10 times than the maximum aggregate size. © 2016, China Water Power Press. All right reserved.
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页码：64 / 71
页数：7
相关论文
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