摘要
针对钢筋混凝土梁裂纹扩展问题,基于扩展有限元法,建立了预置裂纹的简支混凝土梁三维模型,用粘聚裂纹模型描述裂纹面间的力学行为,采用线性的软化曲线表示裂纹尖端断裂过程区的应变软化行为,分别对素混凝土梁和钢筋混凝土梁的复合断裂过程进行模拟,分析了纵向钢筋对裂纹扩展路径、荷载-挠度和荷载-CMOD(裂缝开口处张开位移)曲线的影响,并与文献中的试验结果进行对比,计算结果与试验结果吻合良好,展示了扩展有限元法在结构断裂破坏分析方面的独特优势。
To study the crack propagation of a reinforced concrete beam, a three-dimensional model of a simply supported concrete beam with an embedded crack was established. Based on the extended finite element method （XFEM）, a cohesive crack model was used to describe the mechanical behavior of the crack surfaces. The stain softening behavior of a fracture process zone of the crack tip was represented by a linear softening curve. The mixed-mode fracture process of a plain concrete beam and reinforced concrete beam were simulated. The influences of longitudinal reinforcement on the crack propagation, load-deflection curve and Ioad-CMOD （Crack Mouth Opening Displacement） curve were analyzed. The numerical simulation results show a good agreement with the experiment results. The advantage of XFEM for the structural analysis of fracture failure was presented.
出处
《工程力学》
EI
CSCD
北大核心
2013年第5期215-220,共6页
Engineering Mechanics
基金
国家自然科学基金项目(41172244
41072224)
教育部新世纪优秀人才计划项目(NCET-08-0662)
关键词
扩展有限元
复合断裂
数值模拟
钢筋混凝土梁
粘聚裂纹
XFEM
mixed-mode fracture
numerical simulation
reinforced concrete beam
cohesive crack
