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Structural performance of ultra-high-performance concrete beams with different steel fibers

Title
Structural performance of ultra-high-performance concrete beams with different steel fibers
Author
류두열
Keywords
Ultra-high-performance concrete; Flexure; Steel fiber; Ductility; Sectional analysis; Fiber orientation
Issue Date
2015-11
Publisher
ELSEVIER SCI LTD
Citation
ENGINEERING STRUCTURES, v. 102, Page. 409-423
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. (C) 2015 Elsevier Ltd. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0141029615005283?via%3Dihubhttp://hdl.handle.net/20.500.11754/29182
ISSN
0141-0296; 1873-7323
DOI
10.1016/j.engstruct.2015.08.029
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ARCHITECTURAL ENGINEERING(건축공학부) > Articles
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