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 (ρ= 0.94% and 1.50%) and steel fiber types (smooth and twisted steel fibers) were adopted. In addition, three different fiber lengths (L<inf>f</inf>= 13, 19.5, and 30 mm) for the smooth steel fibers and one fiber length (L<inf>f</inf>= 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.
| Original language | English |
|---|---|
| Article number | 5743 |
| Pages (from-to) | 409-423 |
| Number of pages | 15 |
| Journal | Engineering Structures |
| Volume | 102 |
| DOIs | |
| Publication status | Published - 2015 Nov 1 |
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Keywords
- Ductility
- Fiber orientation
- Flexure
- Sectional analysis
- Steel fiber
- Ultra-high-performance concrete
ASJC Scopus subject areas
- Civil and Structural Engineering
Cite this
Structural performance of ultra-high-performance concrete beams with different steel fibers. / Yoo, Doo Yeol; Yoon, Young Soo.
In: Engineering Structures, Vol. 102, 5743, 01.11.2015, p. 409-423.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Structural performance of ultra-high-performance concrete beams with different steel fibers
AU - Yoo, Doo Yeol
AU - Yoon, Young Soo
PY - 2015/11/1
Y1 - 2015/11/1
N2 - 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 (ρ= 0.94% and 1.50%) and steel fiber types (smooth and twisted steel fibers) were adopted. In addition, three different fiber lengths (Lf= 13, 19.5, and 30 mm) for the smooth steel fibers and one fiber length (Lf= 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.
AB - 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 (ρ= 0.94% and 1.50%) and steel fiber types (smooth and twisted steel fibers) were adopted. In addition, three different fiber lengths (Lf= 13, 19.5, and 30 mm) for the smooth steel fibers and one fiber length (Lf= 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.
KW - Ductility
KW - Fiber orientation
KW - Flexure
KW - Sectional analysis
KW - Steel fiber
KW - Ultra-high-performance concrete
UR - http://www.scopus.com/inward/record.url?scp=84941038828&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84941038828&partnerID=8YFLogxK
U2 - 10.1016/j.engstruct.2015.08.029
DO - 10.1016/j.engstruct.2015.08.029
M3 - Article
AN - SCOPUS:84941038828
VL - 102
SP - 409
EP - 423
JO - Engineering Structures
JF - Engineering Structures
SN - 0141-0296
M1 - 5743
ER -