摘要
基于刚体弹簧法的基本原理,给出了一种用于模拟混凝土断裂力学问题且能够显式描述裂缝的非连续数值方法.采用刚体弹簧模型模拟混凝土,并基于Voronoi图生成其随机网格;采用混凝土单轴应力-应变曲线定义混凝土界面弹簧刚度,并通过能量释放率考虑混凝土受拉软化现象;采用Mohr-Coulomb准则判断混凝土的剪切破坏行为,并考虑了骨料咬合作用对抗剪的影响.选取典型的双边缺口板和单边缺口简支梁为研究对象,通过与试验结果对比分析验证了本文方法的有效性.结果表明：所给方法能够简单合理地模拟结构的开裂行为,对于结构的开裂模式有很好的识别能力,是分析混凝土断裂力学问题的一种可行且有效的方法.
A rigid body spring model with random geometry was proposed to analyze the failure process of concrete structures. In the proposed method,concrete was modeled by the rigid body spring model with random geometry. The spring stiffness of concrete was defined by the uniaixal stress-strain curve of concrete,and the shear failure behavior of concrete was judged by the Mohr-Coulomb criterion. The failure analyses of a doubleedge notched plane under direct shear loading and a single-edge notched beam under two-point loading were conducted by the proposed method,and the results show that the proposed method easily describe the failure process of the concrete components from a continuum to a discontinuity,and the predicted crack pattern and bearing capacity are more close to the experimental results,which means the proposed method is feasible and effective.
作者
赵超
刘波
钟新谷
Zhao Chao;Liu Bo;Zhong Xingu(School of Mechanics and Civil Engineering, China University of Mining and Technology （Beijing）, Beijing 100083, China;School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;State Key Laboratory of Deep Geomeehanics and Underground Engineering, Beijing 100083, China)
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2018年第1期35-41,共7页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
国家自然科学基金资助项目(51678235)
国家自然科学基金资助项目(41472259)
“十三五”国家重点研发计划重点专项(2016YFC080250504)
关键词
混凝土结构
断裂力学
刚体弹簧法
裂缝扩展
VORONOI图
concrete structures
fracture mechanics
the rigid body spring method
crack propagation
Voronoi diagram
