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Advances in Concrete Construction Volume 10, Number 6, December 2020 , pages 559-571 DOI: https://doi.org/10.12989/acc.2020.10.6.559 |
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Axial compression performance of basalt-fiber-reinforced recycled-concrete-filled square steel tubular stub column |
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Xianggang Zhang, Xiang Gao, Xingguo Wang, Ercong Meng and Fang Wang
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| Abstract | ||
| This study aimed to inspect the axial compression mechanical performance of basalt-fiber-reinforced recycled - concrete (BFRRC)-filled square steel tubular stub column. The replacement ratio of recycled coarse aggregate (RCA) and the basalt fiber (BF) dosage were used as variation parameters, and the axial compression performance tests of 15 BFRRC-filled square steel tubular stub column specimens were conducted. The failure mode and the load-displacement/strain curve of the specimen were measured. The working process of the BFRRC-filled square steel tubular stub column was divided into three stages, namely, elastic-elastoplasticity, sudden drawdown, and plasticity. The influence of the design parameters on the peak bearing capacity, energy dissipation performance, and other axial compression performance indexes was discussed. A mathematical model of segmental stiffness degradation was proposed on the basis of the degradation law of combined secantstiffness under axial compression. The full-process curve equation of axial compressive stress-strain was proposed by introducing the influencing factors, including the RCA replacement ratio and the BF dosage, and the calculated curve agreed well with the test-measured curve. | ||
| Key Words | ||
| basalt fiber-reinforced recycled concrete-filled square steel tube; stub column; recycled coarse aggregate replacement ratio; basalt fiber dosage; axial bearing performance; full-curve of stress-strain | ||
| Address | ||
| Xianggang Zhang: School of Urban Construction, Wuchang University of Technology, Wuhan 430223, China; School of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan, China Xiang Gao, Xingguo Wang, Fang Wang: School of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan, China Ercong Meng: CET-College of Engineering and Technology, Southwest University, Chongqing, China | ||
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