Structural performance of ultra-high-performance concrete beams with different steel fibers
- Authors
- Yoo, Doo Yeol; Yoon, Young-Soo
- Issue Date
- Nov-2015
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Ultra-high-performance concrete; Flexure; Steel fiber; Ductility; Sectional analysis; Fiber orientation
- Citation
- ENGINEERING STRUCTURES, v.102, pp.409 - 423
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENGINEERING STRUCTURES
- Volume
- 102
- Start Page
- 409
- End Page
- 423
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/155800
- DOI
- 10.1016/j.engstruct.2015.08.029
- ISSN
- 0141-0296
- Abstract
- In this study, ten large ultra-high-performance concrete (UHPC) beams reinforced with steel rebars were fabricated and tested. The experimental parameters included reinforcement ratio and steel fiber type. Two different reinforcement ratios (rho = 0.94% and 1.50%) and steel fiber types (smooth and twisted steel fibers) were adopted. In addition, three different fiber lengths (L-f = 13, 19.5, and 30 mm) for the smooth steel fibers and one fiber length (L-f = 30 mm) for the twisted steel fiber were considered. For a control specimen, a UHPC matrix without fiber was also considered. Test results indicated that the addition of steel fibers significantly improved the load carrying capacity, post-cracking stiffness, and cracking response, but it decreased the ductility. Specifically, with the inclusion of 2% by volume of steel fibers, approximately 27-54% higher load carrying capacity and 13-73% lower ductility were obtained. In addition, an increase in the length of smooth steel fibers and the use of twisted steel fibers led to the improvements of post-peak response and ductility, whereas no noticeable difference in the load carrying capacity, post-cracking stiffness, and cracking response were obtained according to the fiber length and type. Sectional analysis incorporating the suggested material models was also performed based on AFGC/SETRA recommendations, and the ratios of flexural capacities obtained from experiments and numerical analyses ranged from 0.91 to 1.19.
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