Study on the Boundary Slenderness Ratio Between Short Column and Medium-Long Column Under Axial Compression of Spiral Stirrups

In GB50010-2010 ‘Code for design of concrete structures’, there is no clear stipulation on how to distinguish the spiral stirrup column from short column or medium-long column, which causes confusion to designers in practical engineering design. In order to quantitatively analyze the limit slenderness ratio of spiral stirrup axial compression short column and medium-long column, this paper establishes and verifies the finite element model of spiral stirrup axial compression column based on ABAQUS software. Based on the data obtained by finite element method, the load-displacement curve and ultimate bearing capacity of the component are analyzed, and the judgment method of the limit slenderness ratio of short column and medium-long column is given. Based on this judgment method, the finite element analysis of spiral stirrup axial compression column with different parameters is carried out. The results show that the limit slenderness ratio of the spiral stirrup axial compression short column and the middle and long column is 4.9 to 7.3, which is mainly related to the concrete strength and pitch of the component, and is negatively correlated with the two. The influence of concrete strength on the limit value is affected by the pitch. As the pitch increases, the influence of concrete strength on the limit value gradually decreases. On the basis of calculation and analysis, the proposed formula for calculating the boundary slenderness ratio of short columns and medium-long columns under axial compression of spiral stirrups is proposed.