Han, Zheng, He, Tao
Tests were performed on curved concrete-filled steel tubes under axial compression to see the results from varying cross-section shapes (square and tubes).
Experimental Study, Results, and Discussions
This research paper investigated curved concrete steel tubular members subjected to axial
compression and how the members’ performance is affected by a variety of factors. The main parameters regarding this test include initial deflection at mid-height of a member, slenderness ratio, and tube shape (circular or square). The paper begins by stating the advantages such as the ability to increase load capacity and ductility without increasing size, as compared with traditional concrete columns. Previously, there has been a significant amount of studies based on CFT members, however studies on curved members have been limited. From the experiment, it was determined that the failure mode for all specimens was overall (local and global) buckling. It was concluded that both curved and traditional straight CFT members had similar characteristics.
Analytical Study
A finite element model (FEM) was designed to perform a mechanism analysis of curved CFT members under a full range load versus deformation under axial compression. The model prediction values showed a reasonable agreement when compared to actual test results. ABAQUS was used to analyze CFT members under pure torsion.
Reference
Han, Lin-Hai, et al. “Tests on curved concrete filled steel tubular members subjected to axial compression.” Journal of Constructional Steel Research, vol. 67, no. 6, 2011, pp. 965–976, https://doi.org/10.1016/j.jcsr.2011.01.012.