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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。
Aiming at the problem of crack propagation in reinforced concrete beams, a three-dimensional model of simply supported concrete beams with prefabricated cracks is established based on the extended finite element method. The cohesive crack model is used to describe the mechanical behavior of the cracked surface. The linear softening curve is used to describe the crack tip fracture process The effect of longitudinal reinforcement on crack propagation path, load-deflection and load-CMOD (open displacement at crack opening) curve is analyzed. Compared with the experimental results in the literature, the calculated results are in good agreement with the experimental results and show the unique advantages of the extended finite element method in structural failure analysis.