配筋钢管混凝土短柱轴压力学性能有限元分析

Finite element analysis of axial pressure behavior of reinforced concrete filled steel tubular short columns

为探究配筋钢管混凝土短柱轴压力学性能,首先基于已知文献验证有限元模型的准确性,随后通过变换混凝土保护层厚度、套箍系数、钢管屈服强度以及核心混凝土强度对配筋钢管混凝土短柱的影响,揭示了钢管截面面积的变化相比于钢筋截面面积对套箍效应的影响尤为显著。钢管屈服强度与核心混凝土强度的提高并没有对试件承载力及延性产生显著影响,故认为有必要对二者的匹配关系做进一步研究。混凝土保护层厚度对短柱试件的力学性能影响甚微。

In order to explore the axial compression behavior of reinforced concrete filled steel tubular short columns,firstly verify the accuracy of the finite element model based on the known literature,and then change the influence of concrete cover thickness,hoop coefficient,steel tube yield strength and core concrete strength on reinforced concrete filled steel tubular short columns.It is revealed that the change of steel pipe section area has a significant impact on the hoop effect compared with the change of steel bar section area.The increase of steel pipe yield strength and core concrete strength has no significant impact on the bearing capacity and ductility of the specimen,so it is necessary to further study the matching relationship between the two.The thickness of concrete cover has little effect on the mechanical properties of short column specimens.