Bond-slip response of novel half-hooked steel fibers in ultra-high-performance concrete
- Authors
- Yoo, Doo-Yeol; Choi, Hong-Joon; Kim, Soonho
- Issue Date
- Nov-2019
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Ultra-high-performance concrete; Novel half-hooked steel fiber; End-hook angle; Bond-slip behavior, Rate sensitivity
- Citation
- Construction and Building Materials, v.224, pp.743 - 761
- Indexed
- SCIE
SCOPUS
- Journal Title
- Construction and Building Materials
- Volume
- 224
- Start Page
- 743
- End Page
- 761
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/146878
- DOI
- 10.1016/j.conbuildmat.2019.07.099
- ISSN
- 0950-0618
- Abstract
- In this study, an attempt was made to investigate the effect of end-hook angle on the rate-dependent bond-slip behavior of novel half-hooked steel fibers embedded in ultra-high-performance concrete (UHPC). For evaluating the effects of the number of plastic hinges and length in the end-hook portion, commercially available hooked steel fiber and short half-hooked steel fiber were additionally used. Three different end-hook angles of 30 degrees, 45 degrees, and 60 degrees, two different fiber inclination angles of 0 degrees and 45 degrees to take into account the random orientation of fibers in the composites, and various loading rates ranging from 0.018 mm/s (static) to 1186 mm/s (impact) were considered. Test results indicated that the most influential factor on the static pullout resistance in terms of the bond strengths and pullout energy was the length in the end-hook portion rather than the number of plastic hinges and end-hook angle if the fibers were pulled out without breakage. Increasing the end-hook angle was effective in enhancing the static and dynamic bond strengths and pullout energies of half-hooked fibers in UHPC given the pullout failure mode, and there was no effect of it if they were ruptured. In addition, the increase in length in the end-hook portion significantly improved the static bond strength and pullout energy in the aligned condition, whereas its effectiveness decreased under the impact loads. The use of half-hooked fiber or shorter length in the end-hook portion was effective in terms of the rate sensitivity to the pullout resistance compared with the commercial hooked fiber or the longer-length one, and the bond strength became more sensitive to the loading rate if the fiber was aligned rather than inclined.
- Files in This Item
-
Go to Link
- Appears in
Collections - 서울 공과대학 > 서울 건축공학부 > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/146878)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.