PSI - Issue 70

Abutu Simon John Smith et al. / Procedia Structural Integrity 70 (2025) 59–66

66

• The use of straight steel fiber and lower a /d in UHPFRC-CA beam provide better possibility that a beam designed to fail in shear will fail in shear and vice versa for a beam designed to fail in flexure due to the distance their cracks (whether diagonal or flexural cracks) are formed from the nearest support. • Lower a /d is favorable to the formation of the perfect diagonal crack (crack with 45 o inclination angle) that causes shear failure as well as the perfect flexural crack (crack with 90 o inclination angle) that causes flexural failure. • Finally, this research finding on the behavior of UHPFRC- CA beam’s flexural crack and diagonal crack can assist researchers to tentatively predict the location of the beam’s flexural crack or diagonal crack due to the knowledge of the crack position from the nearest support. The findings on the number of cracks formed in the beam can help support researchers ’ analyses of UHPFRC- CA beam’s absorption of fracture energy and the improvement of its ductility and shear capacity. Results of the load-crack width relationship can be utilized to develop a predictive equation that can in turn be used for the evaluation of the crack width of UHPFRC-CA beams at ultimate loads during experimental design stage. • It is recommended that more investigations should be done on expanding the level of the different shear parameters, so that more robust conclusions can be made on the comparative analyses of the diagonal crack and flexural crack of UHPFRC-CA beams under shear load. Bahij, S., 2016. “Study on shear behavior of ultra - high performance concrete (UHPC) beams,” MSc thesis, Department of Civil Engineering, King Fahd University of Petroleum and Minerals, Dhahran. BS 8110 - 1, 1997. “Structural use of concrete - part 1: code of practice for design and construction,” London, United Kingdom: British Standard Institution. EN 1992 - 1 - 1, 2004. “Design of concrete structures - part 1 - 1: general rules and rules for buildings,” Brussel: European Committee for Standardization (Eurocode). Funk, J. E., Dinger, D. R., 1994. Predictive process control of crowded particulate suspensions, applied to ceramic manufacturing. Boston, U.S.A.: Kluwer Academic Publishers. GB/T 50152, 2012. “Standard for test methods for concrete structures,” Beijing, China: National Standard of the People's Republic of China Jonkers, H. M., 2007. Self - healing concrete: a biological approach, in “ Self - Healing Materials .” In: van der Zwaag, S., (Ed). Springer Series in Materials Science, Dordrecht 100, 195 - 204. Kodur, V., Solhmirzaei, R., Agrawal, A., Aziz, E. M., Soroushian, P., 2018. Analysis of flexural and shear resistance of ultra - high performance fiber reinforced concrete beams without stirrups. Engineering Structures 174, 873 - 884. Marchand, P., 2009. New AFGC recommendations on UHPFRC: chapter 2 - design, in Designing and Building with UHPFRC - State - of - the - art and - development . In: Tootlemonde, F., Resplendino, J., (Eds). Wiley, France, 743 - 754. Narayanan, R., Darwish, I. Y. S., 1987. Use of steel fiber as shear reinforcement. ACI Structural Journal 84, 3, 216 - 227. Niu, Y., Wei, J., Jiao, C., 2021. Crack propagation behavior of ultra - high - performance concrete (UHPC) reinforced with hybrid steel fibers under flexural loading. Construction and Building Materials 294, 123510, 1 - 13. Rathore, R., 2021. A review of bacteria - based self - healing concrete. ACADEMICIA: An International Multidisciplinary Research Journal 11, 12, 839 - 844. Smith, A. S. J., Xu, G., 2024. Influence of key shear factors on the shear performance of ultra - high performance fiber reinforced concrete beam containing coarse aggregate. Periodica Polytechnica Civil Engineering 68, 4, 1378 - 1392. Smith, A. S. J., Xu, G., 2023. Proposed shear capacity equation for ultra - high performance fiber reinforced concrete beam containing coarse aggregate. Structures, 56, 105030, 1 - 12. Walker, T., 2024. Investing in a steel fiber - reinforced concrete warehouse floor? you need to read this first!,” COGRI GROUP . Xi, B., Al - Obaidi, S., Ferrara, L., 2023. Effect of different environments on the self - healing performance of ultra - high performance concrete - a systematic literature review. Construction and Building Materials 374, 130946, 1 - 16. Yang, L., Shi, C., Wu, Z., 2019. Mitigation techniques for autogenous shrinkage of ultra - high - performance concrete - A review. Composites Part B 178, 107456, 1 - 12. Zhang, T., Zhang, M., Shen, Y., Zhu, H., Yan, Z., 2022. Mitigating the damage of ultra - high performance concrete at elevated temperatures using synergistic flame - retardant polymer fiber s. Cement and Concrete Research 158, 106835. Zhang, W., Zheng, Q., Ashour, A., Han, B., 2020. Self - healing cement concrete composites for resilient infrastructures: a review. Composite Part B Engineering 189, 107892. References