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Title |
Flexural Performance of PHC Piles with Infilled concrete and Longitudinal Reinforcing Bars
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Authors |
한선진(Sun-Jin Han) ; 이정민(JungMin Lee) ; 김민석(Min-Seok Kim) ; 김재현(Jae-Hyun Kim) ; 김강수(Kang Su Kim) ; 오영훈(Young-Hun Oh) |
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DOI |
https://doi.org/10.11112/jksmi.2021.25.3.77 |
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Keywords |
PHC 파일; 휨거동; 속채움 콘크리트; 합성성능 PHC pile; Flexural behavior; Infilled concrete; Composite performance |
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Abstract |
In this study, flexural tests of prestressed high strength spun concrete (PHC) piles reinforced with infilled concrete and longitudinal rebars were conducted, where the longitudinal rebar ratio and the presence of sludge formed on the inner surface of PHC pile were set as key test variables. A total of six PHC pile specimens were manufactured, and their flexural behaviors including failure mode, crack pattern, longitudinal strain distribution in a section and end slip between external PHC pile and infilled concrete were measured and discussed in detail. The test results revealed that the flexural stiffness and strength increased as the longitudinal rebar ratio became larger, and that the sludge formed on the inner surface of PHC pile did not show any detrimental effect on the flexural performance. In addition to the experimental approach, this study presents a nonlinear flexural analysis model considering compatibility conditions and strain and stress distributions of the PHC piles and infilled concrete. The rationality of the nonlinear flexural analysis model was verified by comparing it with test results, and it appeared that the proposed model well evaluated the flexural behavior of PHC piles reinforced with infilled concrete and longitudinal rebars with a good accuracy.
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