[Structural Engineering]

Xin Nie, Wei Wang, Yu-Hang Wang, Jie Yu, Chao Hou. Ultimate torsional capacity of steel tube confined reinforcedconcrete columns[J]. Journal of Constructional Steel Research, 2019, 160:207-222.

Keywords: Steel tube confined reinforced concrete (STRC); Pure torsion; FE analysis; Calculation method; Torsional capacity

High Lights: 

The experiments of steel tube confined reinforced concrete (STRC) columns under pure torsion were finished.

Refined finite element models for steel tube confined reinforced concrete columns under pure torsion were established.

Comprehensive parametric analysis of steel tube confined reinforced concrete column under pure torsion was conducted.

Simplified formulae for predicting the torsional capacity of STRC column under pure torsion were proposed.

Abstract: 

Based on two quasi-static experiments of steel tube confined reinforced concrete columns (STRC) under pure torsion load, detailed finite element (FE) simulation and theoretical derivation of the corresponding calculation methods were conducted in this paper. FE models of STRC specimens under pure torsion were established using the finite element software ABAQUS, the feasibility of which was then validated against the testing results in terms of both ultimate torsional capacity and failure modes. Comprehensive parametric analysis was presented, including the yield strength of steel tube, the thickness of steel tube, the dimension of cross-section, the strength of concrete, the yield strength of longitudinal reinforcement, the ratio of longitudinal reinforcement, the yield strength and the ratio of stirrup, to investigate the influence on the torsional capacity of STRC columns with important structural factors. It can be found from the parametric analysis results that, the thickness of steel tube, the dimension of cross-section and the ratio of longitudinal reinforcement are the most important parameters for the torsional capacity of STRC. Based on the results parametric analysis, an accurate and simplified calculation method for the ultimate torsional capacity of STRC columns under pure torsion was proposed.

Resource：

https://www.sciencedirect.com/science/article/pii/S0143974X19302019?via%3Dihub