节点文献
钢与混凝土组合结构节点及构件数值分析方法研究
Study on Numerical Analysis Methods for Joints and Members of Steel-Concrete Composite Structures
【作者】 杜明军；
【导师】 尹越；
【作者基本信息】 天津大学 ， 结构工程， 2009， 硕士
【摘要】 钢与混凝土组合结构具有强度高、延性好、抗震性能优越、施工方便等特点。国内外学者采用有限元方法对钢与混凝土组合结构构件及节点的力学性能进行了一定的研究,但是关于如何建立精确的钢与混凝土组合结构构件及节点有限元模型的研究还很少。开展钢与混凝土组合结构的有限元分析方法的研究,对于确定钢与混凝土组合结构的力学性能,促进钢与混凝土组合结构的技术进步和应用推广,具有一定的理论意义和实用价值。本文建立了N型圆钢管混凝土相贯节点有限元模型,进行了极限承载力和滞回性能分析,通过将有限元分析结果与试验结果进行对比,验证了钢管混凝土节点有限元分析方法的正确性。分析了混凝土本构模型、钢管与混凝土界面摩擦系数和几何非线性等对有限元分析结果的影响。分析发现混凝土本构模型和摩擦系数对分析结果基本没影响,几何非线性对有限元分析结果有一定影响。本文建立了型钢混凝土受弯构件的有限元模型,进行了极限承载力分析,并将有限元分析结果与试验结果进行对比,验证了型钢混凝土构件有限元分析方法的正确性。比较了弥散开裂模型和塑性损伤模型在型钢混凝土有限元分析中的适用性,分析了受拉极限应变对有限元分析结果的影响。并将有限元分析结果与规范相应公式的计算结果进行了比较,规范相应公式计算结果偏于保守。
【Abstract】 Steel - concrete composite structure has obvious merits, such as high strength, good ductility, better seismic behavior, and convenient construction. Finite element method has been widely adopted in the study of steel - concrete composite structures. However, little research has been done on how to establish precise finite element model of steel - concrete composite structure. It is necessary and meaningful to verify different settings in finite element method for the analysis of joints and members of steel - concrete composite structures.Finite element model of a N-type concrete-filled steel tube joint was setup in this paper and the ultimate load-carrying capacity and hysteretic behaviour of the joints were investigated. The FEM analysis results agreed very well those obtained by tests, which verified the rationality of the numerical method. The influences of concrete constitutive model, friction coefficient, and geometric non-linearity on the results of finite element analysis were discussed. It was shown that concrete constitutive model and friction coefficient has little effect on the results of numerical analysis, while the geometric non-linearity has some effect and need to be considered.Finite element model of a steel reinforced concrete beam was setup in this paper, the ultimate load-carrying capacity of the beam under bending load was investigated. The FEM analysis results agreed very well with those obtained by tests, which verified the rationality of the numerical method. Two material models, smeared cracking and damaged plasticity, were adopted and compared for the concrete respectively. The influence of limit strain settings on FEM analysis results was also discussed. Comparison between the FEM analysis results and the formula in related code showed that the formula gives conservative result.