- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
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| Citation: | LIU Zhonghua, SHU Ganping, YAO Zhen, BIAN Zhaowei, YUN Zuoyi, CHENG Hao, MAO Dongxu. Experimental Study on Axial Compressive Mechanical Performance of Concrete-Filled Short Double-Skin Composite Tubular Columns with Inner Corrugated Steel Pipe[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20250410
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To address the problems of premature inward buckling of the inner steel pipe and insufficient confinement to concrete in traditional concrete-filled double-skin composite tubular columns, a novel concrete-filled double-skin composite tubular column with an inner corrugated steel pipe was proposed. By taking the hollow ratio, nominal steel ratio, wall thickness of the corrugated steel pipe, and inner tube configuration as the main parameters, a systematic experimental study on the axial compressive performance of eight concrete-filled short double-skin composite tubular column specimens with inner corrugated steel pipe was conducted. Based on the experimental results, a finite element model was established to further discuss the load-bearing mechanism, confinement effect, and influence rules of key structural parameters of the components under axial loads. The results indicate that all concrete-filled double-skin composite tubular columns with inner corrugated steel pipe exhibit good ductility under axial compression. The failure mode is dominated by local outward buckling of the outer steel pipe, while no obvious instability occurs in the corrugated steel pipe. With an increase in the hollow ratio, the bearing capacity of the components decreases significantly; the nominal steel ratio has a pronounced effect on the bearing capacity, whereas the wall thickness of the corrugated steel pipe has a minor effect on the ultimate bearing capacity. Compared with traditional concrete-filled double-skin composite tubular columns, the peak bearing capacity of the novel components decreases slightly, but the initial stiffness and ductility improve significantly. The strength indices of all specimens are greater than 1.00, reaching a maximum of 1.33, which indicates that a more effective composite effect is formed between the corrugated steel pipe and the concrete. The finite element calculation results further reveal that the corrugated steel pipe provides strong lateral confinement to the sandwiched concrete mainly through the trough regions, while the helical angle has a minor effect on the axial compressive performance, and the waveform parameters have a certain effect on the bearing capacity. The research results provide a reference for the engineering application and design of concrete-filled double-skin composite tubular columns with an inner corrugated steel pipe.
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