|本期目录/Table of Contents|

[1]李苹,任晓丹,李 杰.基于隐式梯度理论的混凝土细观随机断裂模型[J].建筑科学与工程学报,2014,31(03):90-97.
　LI Ping,REN Xiao-dan,LI Jie.Meso Stochastic Fracture Model for Concrete Based on Implicit Gradient Theory[J].Journal of Architecture and Civil Engineering,2014,31(03):90-97.
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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
31卷
期数:
2014年03期
页码:
90-97
栏目:
出版日期:
2014-09-30

文章信息/Info

Title:
Meso Stochastic Fracture Model for Concrete Based on Implicit Gradient Theory
作者:
李苹，任晓丹，李 杰
同济大学土木工程学院
Author(s):
LI Ping, REN Xiao-dan, LI Jie
School of Civil Engineering, Tongji University
关键词:
混凝土; 隐式梯度; 非局部化; 细观随机断裂模型
Keywords:
concrete;  implicit gradient;  nonlocalization;  meso stochastic fracture model
分类号:
-
DOI:
-
文献标志码:
A
摘要:
根据多尺度力学的基本思想，将隐式梯度非局部化理论与串并联弹簧模型理论相结合，建立了混凝土细观随机断裂模型。通过引入微弹簧断裂应变为服从对数正态分布的随机变量，验证了混凝土材料微观断裂的不可控制性；通过引入非局部化比例，解决了传统串并联弹簧模型的层数敏感性问题。对建立的模型从特征参数、局部应变与损伤的演化发展和层数敏感性几个方面进行了分析。最后，将模型结果与试验结果进行了对比，验证了该模型的正确性。研究结果表明：该模型计算效率高，且更加有利于在计算软件中实现。
Abstract:
Based on the basic concept of multiscale mechanics, authors combined the gradient nonlocal theory with seriesparallel spring model and developed a meso stochastic fracuture model for concrete. By introducing the fracture strain as a lognormal stochastic variable, uncontrollability of microfracture for concrete material was validated. Avoidance of layer sensitivity in traditional seriesparallel spring model was achieved with nonlocalization theory. Moreover, the authors analyzed the models from several aspects, such as the characteristic parameter, evolution of local strain and damage, as well as layer sensitivity. Finally, the analysis based on the model were compared with experimental data, to verify the correctness of the model. The study results show that the model has a high efficiency, and can be realized in computer software.

参考文献/References:

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备注/Memo

备注/Memo:
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更新日期/Last Update: 2014-09-30