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Title |
Shear Performance of Large-Diameter Composite PHC Pile Strengthened by In-Filled Concrete and Shear Reinforcement
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Authors |
현정환(Jung-Hwan Hyun) ; 방진욱(Jin-Wook Bang) ; 김윤용(Yun-Yong Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2017.21.6.067 |
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Keywords |
대구경 합성 PHC말뚝 ; 전단보강 철근 ; 속채움 콘크리트 ; 전단보강 ; 합성효과 Large diameter composite PHC pile ; Shear reinforcement ; In-filled concrete ; Composite behavior |
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Abstract |
Recently, the demand for large diameter piles has been rapidly increased in order to secure the allowable bearing capacity of pile foundation due to the increase of large structures such as high rise buildings. In this study, to improve the shear capacity of a conventional PHC pile, a large diameter composite PHC pile strengthened by in-filled concrete and shear reinforcement was manufactured. All the piles were tested according to the shear strength test method of Korean Standard. As a result of the shear test, the F-type piles which are produced without shear reinforcement occurred abrupt horizontal cracks after flexural and inclined shear cracks occurred. On the contrary, the FT-type piles which are produced with shear reinforcement exhibited stable flexural and inclined shear cracks uniformly over the entire pile without abrupt horizontal cracks. Furthermore, the maximum load of the large diameter composite PHC pile improved to 2.9 times in the F series, and more than 3.3 times in the FT series compared to the conventional PHC pile. This result indicated that FT-type piles had excellent composite behavior due to the shear reinforcement and effectively prevented the unstable growth of inclined shear cracks.
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