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Title |
Experimental Study on Transfer Length of Prestressing Strands in UHPC Members
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Authors |
한선진(Sun-Jin Han) ; 박민국(Min-Kook Park) ; 정재훈(Jae Hoon Chung) ; 김강수(Kang Su Kim) ; 서수연(Soo-Yeon Seo) |
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DOI |
https://doi.org/10.4334/JKCI.2019.31.1.041 |
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Keywords |
초고성능 콘크리트 ; 전달길이 ; 고강도 강연선 ; 구조기준 ; 부착성능 UHPC ; transfer length ; high-strength strands ; design code ; bond performance |
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Abstract |
In pretensioned concrete members, a certain distance is required to transfer the prestressing force in strands to the concrete; this is the so-called transfer length, and it is dominated by bond performance between prestressing strands and surrounding concrete. Compared to the normal strength concrete, however, newly developed ultra-high performance concrete (UHPC) shows different bond characteristics of prestressing strands because it has a very dense matrix. Therefore, this experimental study was conducted to investigate the transfer length of prestressing strands in UHPC members, in which the compressive strength of UHPC and volume fraction of steel fiber were considered as the main variables. In addition, by comparing the test results with current code provisions and other models proposed by previous researchers, the applicability for estimation of the transfer length of UHPC members was examined.
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