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Uniaxial Monotonic and Cyclic Compressive Stress–Strain Model for Concrete-Filled Thin-Walled Helical Corrugated Steel Tubes
| 题名： | Uniaxial Monotonic and Cyclic Compressive Stress–Strain Model for Concrete-Filled Thin-Walled Helical Corrugated Steel Tubes |
| 正文语种： | eng |
| 作者： | Yong Fang;Yuyin Wang;Ligui Yang;Hua Yang |
| 作者单位： | Harbin Institute of Technology;Harbin Institute of Technology;Chongqing Jiaotong Univ.;Harbin Institute of Technology |
| 关键词： | Corrugated steel tube (CST);Concrete-filled corrugated steel tube (CFCST);Equivalent confining stress;Monotonic responses;Unloading and reloading rules |
| 摘要： | Abstract Concrete-filled thin-walled helical corrugated steel tubes (CFCST) are innovative composite members suitable for rehabilitating or reconstructing piers/columns under earthquake or long-term corrosion damage. The strength and ductility of the concrete can be effectively improved by the lateral confinement of the thin-walled corrugated steel tube (CST). However, for such a member, the previously proposed monotonic model is not applicable to large helical angles, and no existing cyclic model can be directly employed. Hence, some key indicators, including the nominal hoop stress, equivalent confining stress, peak stress, peak strain, plastic strain, and stress deterioration, are examined based on an enlarged experimental database and the working mechanism of CFCST. Subsequently, a systematic constitutive model with an updated monotonic stress–strain relationship and rational unloading/reloading rules was developed for the CST-confined concrete in this study. The accuracy of the proposed model was validated by the experimental results of both the monotonic and cyclic responses of CST-confined concrete specimens. |
| 出版年： | 2023 |
| 期刊名称： | Journal of structural engineering |
| 卷： | 149 |
| 期： | 6 |
| 页码： | 1.1-1.19 |
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