STRUCTURAL RESPONSE TO DIAGONAL CRACKING IN HIGH-STRENGTH FIBRE-REINFORCED CONCRETE DEEP BEAMS

Dnyaneshwar B. Mohite; Mir Sohail Ali; Prasad Sonar

doi:10.29121/shodhkosh.v4.i2.2023.5913

Authors

Dnyaneshwar B. Mohite Associate Professor, Department of Civil Engineering, CSMSS Chh. Shahu College of Engineering, Chh. Sambhajinagar
Dr. Mir Sohail Ali Associate Professor and Head, Department of Civil Engineering, CSMSS Chh. Shahu College of Engineering, Chh. Sambhajinagar
Prasad Sonar Research Scholar, Dr. Vishwanath Karad MIT World Peace University, Kothrud, Pune, India & Assistant Professor, Department of Civil Engineering, CSMSS Chh. Shahu College of Engineering, Chh. Sambhajinagar

DOI:

https://doi.org/10.29121/shodhkosh.v4.i2.2023.5913

Keywords:

High-Strength Concrete, Fibre-Reinforced Concrete (Frc), Deep Beams, Diagonal Cracks, Shear Behavior

Abstract [English]

The structural performance of deep beams is significantly influenced by the development and propagation of diagonal cracks, which compromise their shear capacity and overall stability. This study investigates the mechanical behavior of diagonal cracks in high-strength fibre-reinforced concrete (HSFRC) deep beams. Fibre reinforcement, known for its crack-bridging capacity and toughness enhancement, offers potential improvements in the ductility and shear resistance of deep beams, particularly under high-stress concentration zones. In this experimental investigation, deep beams with varying fibre contents and types were cast using high-strength concrete and tested under two-point loading conditions. The primary parameters studied include load-bearing capacity, crack initiation and propagation patterns, crack width, and post-cracking behavior. High-resolution digital image correlation techniques and mechanical strain gauges were employed to monitor strain distribution and crack evolution in real time. The results indicate that fibre incorporation significantly delays the onset of diagonal cracking and enhances the post-crack load-carrying capacity. Moreover, the addition of fibres contributes to a more distributed cracking pattern and increases energy absorption, thereby improving the ductility and overall structural resilience. Comparative analysis with control specimens revealed up to 30% enhancement in shear strength and a notable reduction in crack width and spacing. The study concludes that integrating fibres into high-strength concrete can effectively mitigate the adverse effects of diagonal cracking in deep beams, offering a practical solution for enhancing the performance of critical structural elements in modern construction. These findings provide a foundation for future research and development of design guidelines for HSFRC deep beams.

References

Ashour, S. A. (2000). Effect of stirrups on the behavior of continuous deep beams. Structural Engineering and Mechanics, 10(6), 539–553.

Khaloo, A. R., & Afshari, M. (2005). Flexural behavior of small steel fiber reinforced concrete beams. Cement and Concrete Composites, 27(1), 141–149. https://doi.org/10.1016/j.cemconcomp.2004.02.014 DOI: https://doi.org/10.1016/j.cemconcomp.2004.03.004

Kong, F. K., & Sharp, G. R. (1973). Structural idealization for deep beams with web openings. Magazine of Concrete Research, 25(85), 103–110.

Paramasivam, P., & Loo, Y. H. (1997). Shear behavior of fibre reinforced concrete deep beams. ACI Structural Journal, 94(5), 555–563.

RILEM TC 162-TDF. (2003). Test and design methods for steel fibre reinforced concrete: Bending test. Materials and Structures, 36(262), 560–567. https://doi.org/10.1007/BF02479545 DOI: https://doi.org/10.1617/14007

Tan, K. H., & Cheng, G. H. (2006). Shear behavior of steel fiber reinforced high-strength concrete deep beams. Proceedings of the Institution of Civil Engineers – Structures and Buildings, 159(3), 147–155.

Kwak, Y. K., Eom, T. H., & Kim, S. H. (2002). Shear behavior of high-strength concrete deep beams without shear reinforcements. Engineering Structures, 24(6), 755–765. https://doi.org/10.1016/S0141-0296(02)00015-6

Narayanan, R., & Darwish, I. Y. S. (1987). Use of steel fibres as shear reinforcement. ACI Structural Journal, 84(3), 216–227.

Furlan, R., & Figueiras, J. A. (1997). Influence of support conditions on the behavior of reinforced concrete deep beams. ACI Structural Journal, 94(5), 507–516.

Zarrinpour, M., & Wille, K. (2017). Investigation into the shear capacity of ultra-high-performance concrete (UHPC) beams with and without steel fibers. Construction and Building Materials, 151, 628–639. https://doi.org/10.1016/j.conbuildmat.2017.06.099 DOI: https://doi.org/10.1016/j.conbuildmat.2017.06.099

Al-Sulaimani, G. J., Kaleemullah, M., Basunbul, I. A., & Rasheeduzzafar. (1990). Influence of corrosion and cracking on bond behavior and strength of reinforced concrete members. ACI Structural Journal, 87(2), 220–231. DOI: https://doi.org/10.14359/2732

Aoude, H., Belghiti, M., Cook, W. D., & Mitchell, D. (2012). Response of steel fiber-reinforced concrete beams without stirrups. ACI Structural Journal, 109(3), 359–368. DOI: https://doi.org/10.14359/51683749

Barragán, B. E., & Gettu, R. (2003). Influence of the fiber content on the behavior of steel fiber reinforced concrete beams. Cement and Concrete Composites, 25(3), 281–288. DOI: https://doi.org/10.1016/S0958-9465(02)00096-3

Beard, J. L., & Dymond, R. L. (2016). Improved performance of deep beams using macro synthetic fibers. Construction and Building Materials, 127, 721–730.

Campione, G., & La Mendola, L. (2004). Behavior of concrete confined by steel stirrups and/or FRP jackets. ACI Structural Journal, 101(3), 457–466.

CEB-FIP Model Code. (2010). Model Code for Concrete Structures 2010. Lausanne, Switzerland: Fédération Internationale du Béton (fib).

Dias, W. P. S., & Pooliyadda, S. P. (2001). Flexural response of reinforced fibrous concrete beams. Structural Engineering and Mechanics, 12(4), 353–366.

Esfahani, M. R., Kianoush, M. R., & Tajari, A. R. (2007). Flexural behavior of reinforced concrete beams strengthened by CFRP sheets. Engineering Structures, 29(10), 2428–2444. DOI: https://doi.org/10.1016/j.engstruct.2006.12.008

Foster, S. J., & Gilbert, R. I. (1996). The design of deep beams for shear using strut-and-tie models. ACI Structural Journal, 93(3), 347–356.

Higashiyama, H., Sappakittipakorn, M., & Sato, Y. (2012). Shear behavior of high-strength concrete beams reinforced with steel fibers. Procedia Engineering, 14, 2066–2073.

Islam, M. R., & Iqbal, M. J. (2006). Behavior of reinforced concrete beams with steel fibers under different loading rates. Journal of Civil Engineering (IEB), 34(1), 1–9.

Kaklauskas, G., & Ghaboussi, J. (2001). Stress-strain relations for cracked tensile concrete from RC beam tests. ACI Structural Journal, 98(2), 205–212.

Kim, D. J., El-Tawil, S., & Naaman, A. E. (2008). Rate effect on tensile behavior of high-performance fiber reinforced cementitious composites. Materials and Structures, 41(7), 1233–1247.

Kordkheili, M. S., & Naderpour, H. (2015). Performance of RC deep beams strengthened with NSM FRP composites under loading. Latin American Journal of Solids and Structures, 12(9), 1836–1857.

Lee, J., & Fenves, G. L. (1998). Plastic-damage model for cyclic loading of concrete structures. Journal of Engineering Mechanics, 124(8), 892–900. DOI: https://doi.org/10.1061/(ASCE)0733-9399(1998)124:8(892)

Li, V. C. (2003). On engineered cementitious composites (ECC). Journal of Advanced Concrete Technology, 1(3), 215–230. DOI: https://doi.org/10.3151/jact.1.215

Lim, T. Y. D., Paramasivam, P., & Lee, S. L. (1987). Behaviour of reinforced steel-fibre-concrete deep beams in shear. ACI Structural Journal, 84(2), 114–127.

Narayanan, R., & Darwish, I. Y. S. (1987). Use of steel fibres as shear reinforcement. ACI Structural Journal, 84(3), 216–227. DOI: https://doi.org/10.14359/2654

Rahal, K., & Al-Shaikh, A. (1998). Shear strength of reinforced concrete deep beams. ACI Structural Journal, 95(4), 385–394. DOI: https://doi.org/10.14359/581

Xu, B., & Shi, Y. (2009). Experimental research on performance of steel fiber reinforced high-strength concrete. International Journal of Concrete Structures and Materials, 3(2), 145–149.