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    Compression Behavior of Concrete Columns Reinforced with Hybrid Steel-FRP Bars with Enhanced Buckling Resistance

    Source: Journal of Composites for Construction:;2025:;Volume ( 029 ):;issue: 001::page 04024082-1
    Author:
    Yi Zheng
    ,
    Zeyang Sun
    ,
    Yu Tang
    ,
    Gang Wu
    ,
    Hanbin Ge
    DOI: 10.1061/JCCOF2.CCENG-4957
    Publisher: American Society of Civil Engineers
    Abstract: The steel fiber–reinforced polymer (FRP) composite bar (SFCB) is a novel rebar that consists of an inner steel bar and an outer continuous FRP layer. Its configuration enhances durability and provides a stable positive postyield stiffness, which can improve the seismic performance of SFCB-reinforced concrete structures. The buckling resistance of rebars inside concrete columns serves as a crucial safeguard against the collapse of structures under the ultimate limit state. Inspired by the connection in precast concrete structures, a corrugated pipe–confined (CPC) component was designed in this study to enhance the buckling resistance of rebars, which consisted of bundled reinforcement, high-strength grout, and corrugated pipes. Eighteen concrete columns were exploratively tested under axial compression to investigate the responses of rebars inside concrete [SFCBs, basalt FRP (BFRP) bars, and stainless-steel bars], as well as the effect of bundled reinforcement and the CPC component on the buckling resistance. It was found that the maximum lateral deformation of the SFCBs and stainless-steel bars occurred in the middle position between stirrups, whereas the BFRP bars fractured near the stirrups. The external rebars of three- and four-bar bundled reinforcement could prevent the internal rebars from buckling. The CPC specimens displayed double peaks in load–displacement curves due to the function of the CPC components after the weakening of the surrounding concrete. The use of the CPC components could increase the load-carrying capacity of SFCB- and BFRP-reinforced columns by up to 13.9% and 41.6%, and the deformation ability from the peak load to failure could be improved by 73% and 209% at most. Furthermore, the reduction in rebar strain was decelerated, indicating that CPC components can significantly enhance the buckling resistance of rebars and improve the overall performance of reinforced concrete columns. Among the rebars utilized in the test, BFRP bars contributed the least to the peak load of the specimen, accounting for 12%, while SFCBs with similar ultimate tensile load contributed the most by 34%, suggesting a higher compressive efficiency of SFCBs as reinforcement in normal service conditions.
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      Compression Behavior of Concrete Columns Reinforced with Hybrid Steel-FRP Bars with Enhanced Buckling Resistance

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4304233
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    contributor authorYi Zheng
    contributor authorZeyang Sun
    contributor authorYu Tang
    contributor authorGang Wu
    contributor authorHanbin Ge
    date accessioned2025-04-20T10:12:57Z
    date available2025-04-20T10:12:57Z
    date copyright10/25/2024 12:00:00 AM
    date issued2025
    identifier otherJCCOF2.CCENG-4957.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4304233
    description abstractThe steel fiber–reinforced polymer (FRP) composite bar (SFCB) is a novel rebar that consists of an inner steel bar and an outer continuous FRP layer. Its configuration enhances durability and provides a stable positive postyield stiffness, which can improve the seismic performance of SFCB-reinforced concrete structures. The buckling resistance of rebars inside concrete columns serves as a crucial safeguard against the collapse of structures under the ultimate limit state. Inspired by the connection in precast concrete structures, a corrugated pipe–confined (CPC) component was designed in this study to enhance the buckling resistance of rebars, which consisted of bundled reinforcement, high-strength grout, and corrugated pipes. Eighteen concrete columns were exploratively tested under axial compression to investigate the responses of rebars inside concrete [SFCBs, basalt FRP (BFRP) bars, and stainless-steel bars], as well as the effect of bundled reinforcement and the CPC component on the buckling resistance. It was found that the maximum lateral deformation of the SFCBs and stainless-steel bars occurred in the middle position between stirrups, whereas the BFRP bars fractured near the stirrups. The external rebars of three- and four-bar bundled reinforcement could prevent the internal rebars from buckling. The CPC specimens displayed double peaks in load–displacement curves due to the function of the CPC components after the weakening of the surrounding concrete. The use of the CPC components could increase the load-carrying capacity of SFCB- and BFRP-reinforced columns by up to 13.9% and 41.6%, and the deformation ability from the peak load to failure could be improved by 73% and 209% at most. Furthermore, the reduction in rebar strain was decelerated, indicating that CPC components can significantly enhance the buckling resistance of rebars and improve the overall performance of reinforced concrete columns. Among the rebars utilized in the test, BFRP bars contributed the least to the peak load of the specimen, accounting for 12%, while SFCBs with similar ultimate tensile load contributed the most by 34%, suggesting a higher compressive efficiency of SFCBs as reinforcement in normal service conditions.
    publisherAmerican Society of Civil Engineers
    titleCompression Behavior of Concrete Columns Reinforced with Hybrid Steel-FRP Bars with Enhanced Buckling Resistance
    typeJournal Article
    journal volume29
    journal issue1
    journal titleJournal of Composites for Construction
    identifier doi10.1061/JCCOF2.CCENG-4957
    journal fristpage04024082-1
    journal lastpage04024082-15
    page15
    treeJournal of Composites for Construction:;2025:;Volume ( 029 ):;issue: 001
    contenttypeFulltext
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