Impact of Rebar-Reinforcement on Flexural Response of Shear-Critical Ultrahigh-Performance Concrete Beams

Authors: Yassir M. Abbas, Mohammad Iqbal Khan, Galal Fares

Abstract:

In the present work, the structural responses of 12 ultra-high-performance concrete (UHPC) beams to four-point loading conditions were experimentally and analytically studied. The inclusion of a fibrous system in the UHPC material increased its compressive and flexural strengths by 31.5% and 237.8%, respectively. Based on the analysis of the load-deflection curves of UHPC beams, it was found that UHPC beams with a low reinforcement ratio are prone to sudden brittle failure. This failure behavior was changed, however, to a ductile one in beams with medium to high ratios. The implication is that improving UHPC beam tensile reinforcement could result in a higher level of safety. More reinforcement bars also enabled the load-deflection behavior to be improved, particularly after yielding.

Keywords: Ultra-high-performance concrete, moment capacity, RC beams, hybrid fiber, ductility.

References:

[1] Naaman AE, Wille K. The path to ultra-high performance fiber reinforced concrete (UHP-FRC): five decades of progress. Proceedings of Hipermat. 2012:3-15
[2] Manglekar HC, Visage ET, Ray T, Weldon BD. Experimental and Analytical Investigations of a Locally Developed Ultrahigh-Performance Fiber-Reinforced Concrete. J Mater Civ Eng. 2017;29:10.10.1061/(asce)mt.1943-5533.0001732
[3] Yoo D. Performance enhancement of ultra-high-performance fiber-reinforced concrete and model development for practical utilization. Seoul: Korea University. 2014
[4] Naaman AE. Half a century of progress leading to ultra-high performance fiber reinforced concrete: part 1-overall review. Proceedings of the 2nd International RILEM Conference2011. p. 17-26.
[5] Baby F, Marchand P, Toutlemonde F. Shear Behavior of Ultrahigh Performance Fiber-Reinforced Concrete Beams. I: Experimental Investigation. J Struct Eng. 2014;140:10.10.1061/(asce)st.1943-541x.0000907
[6] Turker K, Hasgul U, Birol T, Yavas A, Yazici H. Hybrid fiber use on flexural behavior of ultra high performance fiber reinforced concrete beams. Composite structures. 2019;229:111400
[7] Yokota H, Rokugo K, Sakata N. JSCE recommendations for design and construction of high performance fiber reinforced cement composite with multiple fine cracks. High Performance Fiber Reinforced Cement Composites; Springer: Tokyo, Japan. 2008
[8] Fehling E, Schmidt M, Walraven J, Leutbecher T, Fröhlich S. Ultra-high performance concrete UHPC: Fundamentals, design, examples: John Wiley & Sons; 2015.
[9] Graybeal BA. Material property characterization of ultra-high performance concrete. United States. Federal Highway Administration. Office of Infrastructure …; 2006.
[10] Yang IH, Joh C, Kim B-S. Structural behavior of ultra high performance concrete beams subjected to bending. Engineering Structures. 2010;32:3478-87.http://dx.doi.org/10.1016/j.engstruct.2010.07.017
[11] Yoo D-Y, Yoon Y-S. Structural performance of ultra-high-performance concrete beams with different steel fibers. Engineering Structures. 2015;102:409-23.https://doi.org/10.1016/j.engstruct.2015.08.029
[12] Yoo D-Y, Banthia N, Yoon Y-S. Experimental and numerical study on flexural behavior of UHPFRC beams with low reinforcement ratios. 2017.http://www.nrcresearchpress.com/doi/abs/10.1139/cjce-2015-0384
[13] Singh M, Sheikh AH, Mohamed Ali MS, Visintin P, Griffith MC. Experimental and numerical study of the flexural behaviour of ultra-high performance fibre reinforced concrete beams. Construction and Building Materials. 2017;138:12-25.10.1016/j.conbuildmat.2017.02.002
[14] Yang I-H, Joh C, Kim B-S. Flexural response predictions for ultra-high-performance fibre-reinforced concrete beams. Mag Concr Res. 2012;64:113-27.https://doi.org/10.1680/macr.10.00115
[15] Xia J, Chan T, Mackie KR, Saleem MA, Mirmiran A. Sectional analysis for design of ultra-high performance fiber reinforced concrete beams with passive reinforcement. Engineering Structures. 2018;160:121-32.https://doi.org/10.1016/j.engstruct.2018.01.035
[16] Dancygier A, Savir Z. Flexural behavior of HSFRC with low reinforcement ratios. Engineering structures. 2006;28:1503-12
[17] Yang I-H, Joh C, Kim B-S. Flexural strength of large-scale ultra high performance concrete prestressed T-beams. Canadian Journal of Civil Engineering. 2011;38:1185-95.https://doi.org/10.1139/l11-078
[18] Qi J, Wang J, Ma ZJ. Flexural response of high‐strength steel‐ultra‐high‐performance fiber reinforced concrete beams based on a mesoscale constitutive model: Experiment and theory. Struct Concr. 2018;19:719-34.https://doi.org/10.1002/suco.201700043
[19] Chen S, Zhang R, Jia L-J, Wang J-Y. Flexural behaviour of rebar-reinforced ultra-high-performance concrete beams. Mag Concr Res. 2018;70:997-1015.https://doi.org/10.1680/jmacr.17.00283
[20] Lim T, Paramasivam P, Lee S. Shear and moment capacity of reinforced steel-fibre-concrete beams. Mag Concr Res. 1987;39:148-60.https://doi.org/10.1680/macr.1987.39.140.148
[21] Bae B-I, Choi H-K, Choi C-S. Flexural strength evaluation of reinforced concrete members with ultra high performance concrete. Adv Mater Sci Eng. 2016;2016. https://doi.org/10.1155/2016/2815247
[22] Khalil WI, Tayfur Y. Flexural strength of fibrous ultra high performance reinforced concrete beams. ARPN Journal of Engineering and Applied Sciences. 2013;8:200-14
[23] Imam M, Vandewalle L, Mortelmans F. Shear–moment analysis of reinforced high strength concrete beams containing steel fibres. Canadian Journal of Civil Engineering. 1995;22:462-70. https://doi.org/10.1139/l95-054.
[24] Graybeal, B.A. Compression Testing of Ultra-High-Performance Concrete. Adv. Civ. Eng. Mater. 2014, 4, 20140027. https://doi.org/10.1520/acem20140027.