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Experimental investigation and analysis on the axial compressive performance of recycled concrete‑filled corroded steel tubular columns

Hui Cun, Li Yonggang, Li Ke, Liu Cong, Hai Ran, Li Chunqing

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 2

art. no. e97, 1--22

In this study, the axial compressive performance of recycled concrete-filled corroded steel tubular columns was assessed with different concrete strength grades (C30, C45, C60) and different corrosion degrees (0%, 5%, 10%, 15%, 20%). Axial compression tests on 15 specimens were conducted, and the corresponding load-displacement curves, skeleton curves, stiffness degradation curves, characteristic load, characteristic displacement, failure modes, and the stress-strain distribution in steel tube and concrete specimens were obtained and thoroughly analyzed. The load-bearing capacity of the specimens was calculated by the typical local and international standards. The static calculation model of the specimens was built by the finite element software, and the load-bearing capacity and deformation performance were evaluated and compared with the test results. The results showed that with the increase of corrosion degree under the same load, the specimen deformation and central bulge are more prominent, whereas the load-bearing capacity and stiffness decrease. As the concrete strength increased, the load-bearing capacity of specimens increased significantly. The calculated load-bearing capacity values and the finite element analysis results agree well with the test values. The findings of this research can be used in different engineering applications.