摘要
为研究混凝土梁的断裂过程,提出用基于二维扩展有限元法(eXtended Finite ElementMethod,XFEM)的黏聚性裂缝模型模拟混凝土简支梁在集中载荷作用下的断裂过程.推导考虑近裂尖奇异性的基于XFEM的黏聚性裂缝模型,得出裂缝开度随裂缝长度的变化曲线;对上述模型与相关文献用有限元结合节点释放技术对相同时间的裂缝扩展的计算结果进行比较,二者结果吻合良好,并与实际裂缝扩展过程相符.计算结果证实基于XFEM的黏聚性裂缝模型能有效进行混凝土梁的断裂过程模拟.
To study the crack process of concrete beam,the crack process of simply supported beam under concentrated load is simulated by using cohesive crack model based on 2D eXtended Finite Element Method（XFEM）.The cohesive crack model based on XFEM considering near-tip singular behavior is derived,and the curves of crack opening with the change of crack length is obtained;the results obtained from the model is consistent with that of the literatures,in which finite element node release technology is used to simulate the crack propagation in the same time,and the actual cracking process.The computation results indicate that cohesive crack model based on XFEM can simulate the concrete cracking process effectively.
出处
《计算机辅助工程》
2010年第4期29-33,共5页
Computer Aided Engineering
基金
国家自然科学基金(50879024)
高等学校博士学科点专项科研基金(20070294023)
水文水资源与水利工程科学国家重点实验室专项基金(2009586012)
关键词
黏聚性裂缝
混凝土梁
断裂
扩展有限元法
cohesive crack
concrete beam
crack
extended finite element method
