两种混凝土模型在钢管混凝土有限元中的应用  

Application of Smeared Cracking and Damaged Plasticity Models in FEA of CFT

作　　者：陈曦[1] 周德源[1] 

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《材料科学与工程学报》2008年第2期245-250,320,共7页Journal of Materials Science and Engineering

摘　　要：本文采用Smeared Cracking与Damaged Plasticity两种混凝土模型分别对带约束拉杆和无约束拉杆的方形、矩形钢管混凝土短柱轴压承载力进行有限元分析,探讨每种混凝土模型的特点,并与已有的试验结果对比,结果表明两种模型都适用于带约束拉杆和无约束拉杆的方形、矩形钢管混凝土构件轴心受压承载力分析。采用相关流动法则而低估了混凝土膨胀角和钢管对核心混凝土约束作用的Smeared Cracking模型分析结果略低于试验结果,而采用不相关流动法则的Damaged Plasticity能较好地符合试验结果。This paper carries out finite element analyses （FEA） of the axial strengths of square and rectangular concrete filled steel tubular （CFT） stub columns with and with no binding bars by adopting two models respectively smeared cracking and damaged plasticity, discusses the features of each model, and makes comparison between the results from FEA and the existed experiments. Comparison shows that both models are suitable for simulation of the axial strengths of CFT. And the axial strengths predicted by FEA using smeared cracking model with associated flow rule underestimating the dllation angle and confinement stress of core concrete are slightly lower than the experimental results. But damaged olasticitv model with non-associated flow agrees better with the experimental results.

关 键 词：聚钢管混凝土 有限元分析 屈服条件 流动法则 塑性势函数 

分 类 号：TU528.57[建筑科学—建筑技术科学]