Axial Compression Behavior of Symmetrical Full-Scale Concrete Filled Double Skin Steel Tube Stub Columns
Open Access
- 24 January 2022
- Vol. 14 (2), 223
- https://doi.org/10.3390/sym14020223
Abstract
To investigate the bearing behavior of symmetrical full-scale different strength concrete filled double skin steel tube (CFDST) stub columns, 19 full-scale specimens were designed, considering the slenderness ratio (λ); the compression strength of core concrete and sandwich concrete (fcki, fcko), the thickness of the inner and outer steel tubes (ti, to); the diameter of inner and outer steel tubes (Di, Do); and the tensile strength of the inner and outer steel tubes (fyki, fyko) as the main parameters. Nonlinear constitutive models for concrete considering constraint effect were adopted, and a finite element (FE) model was established using ABAQUS software. By comparing the results between simulations and experiments, the rationality of the modeling method was verified. Based on the FE model, the parameter analysis for CFDST columns were conducted, and the force mechanism, stress distribution, and deformation process were analyzed. The results showed that the axial compression bearing capacity () increased significantly with an increase in fcki, to, Do, and fcko, while decreased gradually with an increase in λ. Finally, according to the calculated results of the specimens, the calculation formula for of full-scale composite columns was statistically regressed using 1stOpt software and showed a good agreement with the FE.
Keywords
Funding Information
- Scientific Research Fund of Institute of Engineering Mechanics, China Earthquake Administration (2020D07, HITCE201908, HB20GL055, 2020YDL-02)
- Natural Science Foundation of Heilongjiang Province (LH2020E018)
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