Replacing stirrups of self-compacting concrete beams with steel fibers

Abstract

Based on the investigation of fiber influence on workability of self-compacting concrete (SCC), tests were carried out on two series of SCC rectangular simply supported beams, which were made of hooked steel fibers reinforced concrete with or without stirrups, subjected to four-point symmetrically placed vertical loads. The major test variables are steel fiber contents and stirrup ratios. The results indicate that the ultimate load significantly increases with the increase of fiber content; the addition of steel fibers in adequate percentage can change the failure mode from a brittle shear collapse into a ductile flexural mechanism. The stirrups can be partially replaced by steel fibers. The combination of stirrups and steel fibers demonstrated a positive hybrid effect on the mechanical behavior.

Keywords

steel fiber / self-compacting concrete / beam / ultimate shear strength / failure mode / workability

References

[1] Prodromos D. Z., George C. Papadakis. Diagonal shear failure and size effect in RC beams without web reinforcement[ J] Journal of Structural Engineering, 2001, 127(7): 733-742.

[2] Cucchiara C., La Mendola L., Papia M. Effectiveness of stirrups and steel fibers as shear reinforcement[ J] Cement & Concrete Composites, 2004, 26 777-786.

[3] Yoon-Keun K., Eberhard Marc O., Woo-Suk K., et al. Shear strength of steel fiber-reinforced concrete beams without stirrups[J]. ACI Structural Journal, 2002, 99(4): 530-537.

[4] Russo G., Somma G., Angeli P. Design shear strength formula for high strength concrete beams[J]. Materials and Structures, 2004, 37 680-688.

[5] Zhang H., Huang Chengkui. Experimental study on shear resistance of steel fiber reinforced high strength concrete beams[J]. Journal of Harbin Institute of Technology, 2006, 38(10): 1781-1785.

[6] Plizzari G. A., Tiberti G. Steel fibers as reinforcement for precast tunnel segments[J]. Tunnelling and Underground Space Technology, 2006, 21 438-439.

[7] Youssef C., Marí Antonio R., Antoni C. Shear behaviour of full-scale prestressed i-beams made with self compacting concrete[J]. Materials and Structures, 2008, 41(1): 131-141.

[8] Tom G., Moncef N. Shear behavior of fiber-reinforced self-consolidating concrete slender beams[J]. ACI Materials Journal, 2008, 105(5): 468-477.

[9] National Standard of the People’s Republic of China. GB 50010-2002, Code for Design of Concrete Structures[S]. 2002, Beijing: China Architecture and Building Press.

[10] National Standard of the People’s Republic of China. GB50152-92, Test Methods of Concrete Structures[S]. 1992, Beijing: China Architecture and Building Press.

[11] Ding Y., Wang Y., Dong Xiangjun. An investigation on the workability of fiber reinforced self-compacting high performance concrete[J]. China Civil Engineering Journal, 2005, 38(11): 51-57.

[12] Liu S., Ding Yining. Study on early age restrained shrinkage of fiber reinforced self-compacting concrete[J]. Journal of Building Materials, 2008, 11(1): 8 13

[13] EFNARC. Specification and Guidelines for Self-Compacting Concrete[S]. 2002.

[14] The SCC European Project Group. The European Guidelines for Self-Compacting Concrete-Specification, Production and Use[S]. 2005.

[15] Brite EuRam. Task 9 End Product-SCC Guidelines[S]. 2000.

[16] ACI Committee 318 ACI 318-05, Building Code Requirements for Reinforced Concrete and Commentary (318R-05)[S]. 2005, Farmington Hills, MI: American Concrete Institute 430