Headed bars in simulated exterior beam-column joints of UHPFRC
- Authors
- Sim, Hye-Jung; Chun, Sungchul; Choi, Sokhwan; Yu, Eunjong
- Issue Date
- Oct-2018
- Publisher
- ICE Publishing
- Keywords
- anchors & anchorages; bond; reinforcement
- Citation
- Magazine of Concrete Research, v.70, no.19, pp.1016 - 1026
- Indexed
- SCIE
SCOPUS
- Journal Title
- Magazine of Concrete Research
- Volume
- 70
- Number
- 19
- Start Page
- 1016
- End Page
- 1026
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/149253
- DOI
- 10.1680/jmacr.17.00355
- ISSN
- 0024-9831
- Abstract
- Ultra-high-performance fibre-reinforced concrete (UHPFRC) exhibits improved compressive and tensile strengths considerably superior to those of conventional concrete. While these characteristics can significantly reduce the cross-sectional area of the member, the space for accommodating development lengths of straight or hooked bars is deficient. A headed bar can be a viable option for this problem. The anchorage strengths of headed bars were evaluated by simulated exterior beam-column joint tests where the joints were cast of 120, 150 or 180 MPa UHPFRC. A headed bar with only 4d(b) embedment length in 120 MPa UHPFRC can develop a yield strength of 600 MPa. The effects of embedment length, bar diameter and compressive strength of UHPFRC on the anchorage strength of headed bars are investigated. From a regression analysis, assuming that the anchorage strength is proportional to (f(c)')(alpha) a model for predicting the anchorage strength of headed bars in UHPFRC is developed.
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