期刊
COMPOSITE STRUCTURES
卷 262, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2021.113589
关键词
Seawater sea-sand concrete (SSC); Recycled coarse aggregates; Corner radius; FRP confined concrete; Hoop strain distribution
资金
- National Key Research and Development Project of China, China [2018YFE0125000]
- National Natural Science Foundation of China, China [52078299, 51808348]
- Guangdong Basic and Applied Basic Research Fund Project, China [2020A1515011552]
- Shenzhen Basic Research Project, China [JCYJ20170817100253542]
The study demonstrated that replacing natural aggregates with recycled aggregates can enhance the CFRP-confinement effectiveness, leading to higher ultimate strength and strain enhancement in concrete. Additionally, the impact of the corner radius ratio on CFRP-confined SSRAC is more pronounced compared to CFRP confined natural aggregate concrete.
This paper presents an experimental study on the axial stress?strain behavior of carbon fiber-reinforced polymer (CFRP)-confined seawater sea-sand recycled aggregate concrete (SSRAC) columns. Forty-two circular and square specimens were tested under axial compression, and the effects of the aggregate replacement ratio, CFRP thickness, and corner radius were investigated. The results indicated that, by replacing natural aggregates with recycled aggregates (RAs), the CFRP-confinement effectiveness can be enhanced, showing a higher enhancement ratio in the ultimate strength and strain. The effect of the corner radius ratio on the ultimate condition of CFRP-confined SSRAC is also more pronounced compared with CFRP confined natural aggregate concrete (NAC). This conclusion was also validated by the nonuniform hoop strain distribution for specimens with varying corner radius ratios. The difference in CFRP confinement efficiency caused by the recycled aggregate replacement and corner radius is accurately captured by the DIC (Digital image correlation) measurement system. By reasonably taking the coupling effect of RAs and the corner radius ratio into account for the confinement efficiency parameter, the proposed ultimate strength and strain model for CFRP-confined SSRAC demonstrates a satisfactory performance when compared with test results.
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