- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LIANG Huanwei, XU Chunrong, LIN Yu, WU Jianli, XIA Fuyou, YAN Pengfan, ZHAO Canhui. Influence of Axial Compression Ratio on Hysteretic Properties of Steel Shell-Concrete Pylon[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240559
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To investigate the influence of the axial compression ratio on the hysteretic properties of the steel shell-concrete composite pylon, based on the composite pylon structure without longitudinal rebars, three hysteretic specimens were designed with the axial compression ratio as the research parameter. Through testing, the hysteresis curves, failure characteristics, and strain development of each specimen were obtained, and the mechanical behavior under large eccentric failure was analyzed. A finite element model was then established using ABAQUS for further analysis, and the boundary failure conditions of the pylon section were determined. Then, calculation formulas for the axial compression and bending moment of the section under boundary failure were proposed, and the effect of the steel ratio and concrete strength on the axial compression ratio under boundary failure was discussed. The research results indicate that under large eccentric failure, the section stiffness, peak bearing capacity, and energy dissipation capacity increase with the axial compression ratio. When the axial compression ratio increases from 0.056 to 0.166, the stiffness and the flexural capacity of the specimen improve by 20%. The boundary failure condition of the composite pylon section is defined by the yielding of the tensile-side steel shell and crushing of the compressive-side concrete. Under boundary failure, the section achieves its highest flexural capacity and stiffness. The proposed calculation formulas provide an accurate assessment of the axial compression ratio and flexural capacity under boundary failure. Both an increase in steel ratio and concrete strength lead to a reduction in the axial compression ratio at boundary failure. The axial compression ratio under boundary failure in the composite pylon section falls within the range of 0.44–0.56, making it well-suited for long-span suspension bridge towers with higher axial compression ratios.
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