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Structural Engineering and Mechanics Volume 85, Number 5, March10 2023 , pages 693-707 DOI: https://doi.org/10.12989/sem.2023.85.5.693 |
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Numerical simulation on the cyclic behavior of ultra-high performance concrete filled steel tubular column |
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Heng Cai and Fangqian Deng
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| Abstract | ||
| In order to deeply reveal the working mechanism of ultra-high performance concrete (UHPC) filled steel tubular columns (UHPCFSTs) under cyclic loading, a three-dimension (3D) macro-mesoscale finite element (FE) model was established considering the randomness of steel fibers and the damage of UHPC. Model correctness and reliability were verified based on the experimental results. Next, the whole failure process of UHPC reinforced with steel fibers, passive confinement effect and internal force distribution laws were comprehensively analyzed and discussed. Finally, a simplified and practical method was proposed for predicting the ultimate bending strengths of UHPCFSTs. It was found that the non-uniform confinement effect of steel tube occurred when the drift ratio exceeded 0.5%, while the confining stress increased then decreased afterwards. There was preferable synergy between the steel tube and UHPC until failure. Compared with experimental results, the ultimate bending strengths of UHPCFSTs were undervalued by the current code provisions such as AISC360-10, EC4 and GB50936 with computed mean values (MVs) of 0.855, 0.880 and 0.836, respectively. The proposed practical method was highly accurate, as evidenced by a mean value of 1.058. | ||
| Key Words | ||
| cyclic behavior; macro-meso model; UHPCFST; ultimate bending strengths; working mechanism | ||
| Address | ||
| Heng Cai: School of Civil Engineering, Hubei Polytechnic University, Huangshi 435003, China; School of Civil Engineering, Wuhan University, Wuhan 430072, China Fangqian Deng: School of Civil Engineering, Wuhan University, Wuhan 430072, China | ||