Influence of slenderness on the axial compressive bearing capacity of a five-spiral stirrup for circular reinforced concrete columns

This paper established finite element (FE) models using the ABAQUS software to examine the influ⁃ ence of the slenderness ratio on the axial compressive performance of a five-spiral stirrup for circular reinforced concrete columns，and numerically simulated it under axial compression. We compared the FE analysis results with the experimental results reported previously to validate the rationality of the models. Based on the verified FE models, components having initial eccentricity with different length diameter ratios and diameters were estab⁃ lished, and the FE analysis of their axial compression was conducted. The analysis results revealed that for the same set of components, both the bearing capacity and stability coefficient decreased with the increase of length diameter ratios; however, lateral deflection increased step by step, and the influence of the second-order effect became increasingly significant. At the same length diameter ratio, the influence of length diameter ratio on the decline of peak bearing capacity of the component was reduced with the increase in section area, and the stabili⁃ ty coefficient increased. Thus, we modified the stability coefficient of the calculation formula on the axial com⁃ pressive bearing capacity of the five-spiral stirrup for circular reinforced concrete columns according to the FE analysis results and provided suggestions for the value of the stability coefficient, when the slenderness ratio of the core area of the circular RC column is 212, the stability coefficient can be taken from the table, if the slen⁃ derness ratio of the core area is not an integer, linear interpolation method can be used for value selection, or the stability coefficient calculation formula can be used for calculation. © 2023 Editorial Board of Journal of Harbin Engineering. All rights reserved.