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Steel and Composite Structures Volume 37, Number 2, October25 2020 , pages 211-227 DOI: https://doi.org/10.12989/scs.2020.37.2.211 |
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Compressive resistance behavior of UHPFRC encased steel composite stub column |
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Zhenyu Huang, Xinxiong Huang, Weiwen Li and Jiasheng Zhang
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| Abstract | ||
| To explore the feasibility of eliminating the longitudinal rebars and stirrups by using ultra-high-performance fiber reinforcement concrete (UHPFRC) in concrete encased steel composite stub column, compressive behavior of UHPFRC encased steel stub column has been experimentally investigated. Effect of concrete types (normal strength concrete, high strength concrete and UHPFRC), fiber fractions, and transverse reinforcement ratio on failure mode, ductility behavior and axial compressive resistance of composite columns have been quantified through axial compression tests. The experimental results show that concrete encased composite columns with NSC and HSC exhibit concrete crushing and spalling failure, respectively, while composite columns using UHPFRC exhibit concrete spitting and no concrete spalling is observed after failure. The incorporation of steel fiber as micro reinforcement significantly improves the concrete toughness, restrains the crack propagation and thus avoids the concrete spalling. No evidence of local buckling of rebars or yielding of stirrups has been detected in composite columns using UHPFRC. Steel fibers improve the bond strength between the concrete and, rebars and core shaped steel which contribute to the improvement of confining pressure on concrete. Three prediction models in Eurocode 4, AISC 360 and JGJ 138 and a proposed toughness index (T.I.) are employed to evaluate the compressive resistance and post peak ductility of the composite columns. It is found that all these three models predict close the compressive resistance of UHPFRC encased composite columns with/without the transverse reinforcement. UHPFRC encased composite columns can achieve a comparable level of ductility with the reinforced concrete (RC) columns using normal strength concrete. In terms of compressive resistance behavior, the feasibility of UHPFRC encased steel composite stub columns with lesser longitudinal reinforcement and stirrups has been verified in this study. | ||
| Key Words | ||
| concrete encased column; ultra-high-performance fiber reinforcement concrete (UHPFRC); steel-concrete composite; axial compression | ||
| Address | ||
| Zhenyu Huang: Guangdong Provincial Key Laboratory of Durability of Marine Civil Engineering, Shenzhen University, Shenzhen 518060, China; College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, Zhejiang, China Xinxiong Huang: Guangdong Provincial Key Laboratory of Durability of Marine Civil Engineering, Shenzhen University, Shenzhen 518060, China; College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; Guangzhou Expressway Co., Ltd, Guangzhou Communications Investment Group Co., Ltd, Guangzhou 510288, China Weiwen Li: Guangdong Provincial Key Laboratory of Durability of Marine Civil Engineering, Shenzhen University, Shenzhen 518060, China; College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; Jiasheng Zhang: CCFED the Fifth Construction & Engineering Co., Ltd, Shenzhen 518000, China | ||