圆钢管高强混凝土轴压短柱承载力有限元分析

Finite-element analysis of axial bearing capacity of circular steel tube with high strength concrete

应用Open SEES有限元软件计算圆钢管混凝土短柱的轴压承载力-应变关系曲线。由于钢管和混凝土之间相互作用的机理,分别采用Mander混凝土本构模型和根据套箍系数修正Mander混凝土本构模型,计算结果与实验结果吻合较好。应用此材料本构模拟圆钢管高强混凝土短柱并讨论不同参数的影响。结果表明:基于试验的Open SEES建模方式与模型参数选取合理;圆钢管高强混凝土与普通混凝土的力学性能差异大;增大核心混凝土的强度、钢材的套箍系数和屈服强度都可以提高构件的极限承载力。

Application of OpenSEES finite element software to calculate the axial compressive bearing capacity of concrete filled circular steel tubular short columns. Because of the mechanism of the interaction between the steel tube and concrete, the Mander concrete constitutive model is adopted and the Mander concrete constitutive model is modified according to the hoop coefficient. The calculated results are in good agreement with the experimental re- sults. Application of this material to the construction of high strength concrete short columns of circular steel tube and discuss the influence of different parameters. The results show that the test OPENSEES modeling and model pa- rameters based on reasonable selection; round steel tube high strength concrete and ordinary concrete mechanics performance difference ; increase of core concrete strength, steel hoop coefficient and yield strength can improve the ultimate bearing capacity of member.