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工程力学  2013 

基于扩展有限元法的钢筋混凝土梁复合断裂过程模拟研究

DOI: 10.6052/j.issn.1000-4750.2012.03.0205, PP. 215-220

Keywords: 扩展有限元,复合断裂,数值模拟,钢筋混凝土梁,粘聚裂纹

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Abstract:

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。

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