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Recycled aggregate concrete-filled steel tube columns with small-diameter circular FRP-confined sea-sand concrete cores: Conceptual and experimental investigations

Lan Zeng, Liqi Wu, Boqin Li, Shu Fang, Hazem Samih Mohamed, Zhuangcheng Fang, Hong Yuan

Construction and Building Materials（2023）

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Abstract
•FRP-confined SSC cores show effectiveness in enhancing RAC-filled steel tube columns.•RAC-filled steel tube columns with FRP-confined SSC cores show promising performance.•Effects of FRP-confined SSC core configurations and concrete strength were analyzed.•A reasonable load capacity model for the proposed columns was presented.•Seamless steel tubes could exploit compressive performance of the proposed columns.
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Key words
Recycled aggregate concrete,Concrete-filled steel tube columns,Sea-sand concrete (SSC),Fiber-reinforced polymer (FRP)-confined concrete core,Axial compressive performance
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